Jérôme Plain | Université de Technologie de Troyes (UTT) (original) (raw)

Papers by Jérôme Plain

International audienceThis letter provides a brief summary on early work and developments on both... more International audienceThis letter provides a brief summary on early work and developments on both controlling and studying the optical properties of resonant metal nanoparticles and reports on all progress achieved since two years. Our approach is based on controlled nanoscale photopolymerization triggered by local enhanced electromagnetic fields of silver nanoparticles excited close to their dipolar plasmon resonance. By anisotropic polymerization, symmetry of the refractive index of the surrounding medium was broken: C1v symmetry turned to C2v symmetry. This approach has overcome all the difficulties faced by scanning probe methodologies to reproduce the form of the near field of the localized surface plasmons and provides a new way to quantify its magnitude. Furthermore, this approach leads to the production of polymer/metal hybrid nano-systems of new optical properties

Nanoscale, 2021

The top surface roughness of Al nanodisk has significant influences on the substrate-induced out-... more The top surface roughness of Al nanodisk has significant influences on the substrate-induced out-of-plane quadrupolar mode Q and in-plane dipolar mode D.

Numerous cell mechanisms and pathways rely on dynamic interactions of RNAs or DNAs with proteins ... more Numerous cell mechanisms and pathways rely on dynamic interactions of RNAs or DNAs with proteins that induce local and transient changes in their secondary and tertiary structures. Information on the structure of the protein/nucleic acid complexes is already very well documented thanks to techniques such as X-ray diffraction, NMR or electron microscopy. But their limits are quickly reached when it comes to monitor the dynamics of these interactions. In this case, Fluorescence-based techniques represent the best solution, and given that nucleobases are almost not fluorescent, the introduction of thienoguanosine (thG), a truly faithful emissive and responsive surrogate for Guanosine, represents a breakthrough in our work. Currently we are building a setup which will allow us to perform single molecules experiments with thG labelled oligonucleotides and take advantages of its environment sensitive fluorescence properties. The aim is to report and document thG fluorescence changes during DNA methylation and more precisely to faithfully monitor the base flipping process occurring during this methylation. Complementary to the setup, several steps need to be completed in order to achieve these observations, starting by the functionalization of our quartz slides, to specifically attach thG labelled ODNs to our surface and avoid parasite fluorescence due to the thG excitation wavelength located in the UV range (between 300 and 400 nm). Another important part of our work will be to perform a clear and reproducible activity test on all the proteins involved in the base flipping process (DNMT1, SRA, UHFR1) and a potential production on siteùùùùù;

We report on the imaging of localized electric field on a metal/dielectric interface of gold nano... more We report on the imaging of localized electric field on a metal/dielectric interface of gold nanorods irradiated out of their resonance. The surface polarization charges caused by the discontinuity of electric field at metal/dielectric surface provide a tiny local field enhancement. At some precise positions on the nanorod surface, the resulting effective local field intensity becomes high enough to overcome the threshold dose of a photo-sensitive formulation, and hence the polymerization process is initiated. We finally end up with a cross-linked 3D polymer structure that is actually molding the spatial distribution of the surface charges held on the metal/dielectric interface.

The Journal of Physical Chemistry C, 2020

The plasmon resonances (modes) of a metal nanostructure can be defined as a dipole, a quadrupole,... more The plasmon resonances (modes) of a metal nanostructure can be defined as a dipole, a quadrupole, or high-order modes depending on the surface charge distribution induced by the incident field. In a non-symmetrical environment or clusters, the modes can hybridize and exhibit different behavior and properties. In this work, we study experimentally and numerically the substrate-induced hybridization of plasmonic modes of a silver nanocylinder. The applications of plasmonic nanoparticles such as refractive index sensing and enhanced spectroscopies often rely on the sustained mode spectral position and specific spatial near-field distribution. However, we show that the implementation of such plasmonic nanoparticles in a sensing system can result in a change of the modes nature, its hybridization or dehybridization. These changes are not clearly pronounced in the far-field spectra and then may result in unexpected modifications of the sensor behavior. We show that the hybridization between the dipolar and quadrupolar modes of the plasmonic nanoparticle on the substrate results from quadrupolar mode excitation due to the superposition of the reflected and incoming light and, then, depends on the reflection of the substrate. The existence of the hybridized modes strongly depends on the surrounding environment of nanoparticles, and after the deposition of the nanometric polymer layer on top of the nanoparticle the hybridized modes vanish and are replaced by uncoupled multipolar resonances.

The Journal of Physical Chemistry C, 2021

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires

ACS Applied Materials & Interfaces, 2021

Temperature characterization and quantification at the nanoscale remain core challenges in applic... more Temperature characterization and quantification at the nanoscale remain core challenges in applications based on photoinduced heating of nanoparticles. Here, we propose a new approach to obtain quantitative temperature measurements on individual nanoparticles by combining modulated photothermal stimulation and heterodyne digital holography. From full-field reconstructed holograms, temperature is determined with a precision of 0.3 K via a simple approach without requiring any calibration or fitting parameters. As an application, the dependence of temperature on the aspect ratio of gold nanoparticles is investigated. A good agreement with numerical simulation is observed.

Optics Express, 2021

A single metallic nanodisk is the simplest plasmonic nanostructure, but it is robust enough to ge... more A single metallic nanodisk is the simplest plasmonic nanostructure, but it is robust enough to generate a Fano resonance in the forward and backward scattering spectra by the increment of nanodisk height in the symmetric and asymmetric dielectric environment. Thanks to the phase retardation effect, the non-uniform distribution of electric field along the height of aluminum (Al) nanodisk generates the out-of-plane higher-order modes, which interfere with the dipolar mode and subsequently result in the Fano-lineshape scattering spectra. Meanwhile, the symmetry-breaking effect by the dielectric substrate and the increment of refractive index of the symmetric dielectric environment further accelerate the phase retardation effect and contribute to the appearance of out-of-plane modes. The experimental results on the periodic Al nanodisk arrays with different heights confirm the retardation-induced higher modes in the asymmetric and symmetric environment. The appearance of higher modes an...

Nature Communications, 2020

Hybrid plasmonic nano-emitters based on the combination of quantum dot emitters (QD) and plasmoni... more Hybrid plasmonic nano-emitters based on the combination of quantum dot emitters (QD) and plasmonic nanoantennas open up new perspectives in the control of light. However, precise positioning of any active medium at the nanoscale constitutes a challenge. Here, we report on the optimal overlap of antenna’s near-field and active medium whose spatial distribution is controlled via a plasmon-triggered 2-photon polymerization of a photosensitive formulation containing QDs. Au nanoparticles of various geometries are considered. The response of these hybrid nano-emitters is shown to be highly sensitive to the light polarization. Different light emission states are evidenced by photoluminescence measurements. These states correspond to polarization-sensitive nanoscale overlap between the exciting local field and the active medium distribution. The decrease of the QD concentration within the monomer formulation allows trapping of a single quantum dot in the vicinity of the Au particle. The la...

Journal of Physics: Conference Series, 2020

The present paper aims at introducing preliminary results about the magnetoplasmonic properties o... more The present paper aims at introducing preliminary results about the magnetoplasmonic properties of bimetallic nanorods. Our study seems confirming that the Localized Surface Plasmon Resonance (LSPR) wavelength of such structures could be tuned by applying an external magnetic field, which could open new perspectives of applications.

Advances in Materials Science and Engineering, 2019

The scattering and absorption efficiencies of light by a single silicon/silica/gold spherical mul... more The scattering and absorption efficiencies of light by a single silicon/silica/gold spherical multishell in biological tissues are analyzed theoretically in the framework of Lorenz–Mie theory and finite-difference time-domain formalism. We first revised the ideal case of a concentric silicon/gold nanoshell, analyzed the effect of growing a silica layer of uniform thickness around the silicon core, and then examined the effect of an offset of the gold shell with respect to the centre of the silicon/silica nanoshell. Our simulation showed that the silicon/gold nanoshell in the biological tissue supports significant absorption and scattering resonances in the biological spectral window. On the contrary, the growth of a silica layer on the silicon core surface leads to a blueshift of these resonances accompanied by a slight increase of their magnitudes. The offset of the gold shell with respect to the silicon/silica core results in a redshift of the absorption and scattering resonances ...

Optical Materials Express, 2018

Aluminum is now regarded as one of the best metals for pushing plasmonics towards ultraviolet. Wh... more Aluminum is now regarded as one of the best metals for pushing plasmonics towards ultraviolet. When exposed to air, a 3-5 nm alumina shell is formed rapidly around aluminum, preventing further oxygen penetration. This natural oxidation layer is known to chemically stabilize Al. Nevertheless, due to the large surface to volume ratio of Al nanoparticles, their long-term stability is an issue, especially when they are polycrystalline. This critical point has to be developed as the optical properties of conventionally evaporated Al nanostructures may evolve over time. In this article, the evolution of the plasmonic properties sustained by Al nanodisks with a varying oxidation layer is studied by numerical calculations. Their stability over time is also experimentally monitored over 250 days. When exposed to ambient air, their optical properties are preserved for 90 days whatever their diameter, due to a very slight oxidation. Beyond this period, the nanodisks lose their optical properties more or less rapidly depending, this time, on their diameter. A competition between oxidation and self-annealing is proposed in order to explain these results. Nanodisks with a particular diameter of 100 nm are surprisingly stable, exhibiting plasmonic resonances lasting over 250 days. Additionally, when Al nanodisks are exposed to a water environment, a strong corrosion effect shortens their lifetime to 5 days. The obtained results are of importance for further use of conventionally evaporated Al nanostructures for optical applications, as they should remain stable over a long period of time.

Organic Electronics, 2019

Highly efficient and foldable top-emission organic lightemitting diodes based on Ag-nanoparticles... more Highly efficient and foldable top-emission organic lightemitting diodes based on Ag-nanoparticles modified graphite electrode, Organic Electronics (2018), doi:

Physical Review B, 2017

Aluminum nanostructures have recently been at the focus of numerous studies due to their properti... more Aluminum nanostructures have recently been at the focus of numerous studies due to their properties including oxidation stability and surface plasmon resonances covering the ultraviolet and visible spectral windows. In this article, we reveal a new facet of this metal relevant for both plasmonics purpose and photo-thermal conversion. The field distribution of high order plasmonic resonances existing in two-dimensional Al structures is studied by nonlinear photoluminescence (nPL) microscopy in a spectral region where electronic interband transitions occur. The polarization sensitivity of the field intensity maps shows that the electric field concentration can be addressed and controlled ondemand. We use a numerical tool based on the Green dyadic method to analyze our results and to simulate the absorbed energy that is locally converted into heat. The polarization-dependent temperature increase of the Al structures is experimentally quantitatively measured, and is in an excellent agreement with theoretical predictions. Our work highlights Al as a promising candidate for designing thermal nanosources integrated in coplanar geometries for thermally assisted nanomanipulation or biophysical applications.

ACS Photonics, 2017

We use electron energy loss spectroscopy (EELS) to perform a comprehensive spectroscopy and mappi... more We use electron energy loss spectroscopy (EELS) to perform a comprehensive spectroscopy and mapping of the plasmonic modes sustained by aluminum nanotriangles. Behind the apparent simplicity of such structures, a rich variety of plasmonic modes is observed. Edge modes and pseudoradial breathing modes (pseudo-RBMs) are unveiled as they couple efficiently with the electron source. We propose analytical models confirmed by rigorous simulations to index both families of modes and describe their spatial symmetry. Edge modes could be indexed as nanoantenna modes, while pseudo-RBMs match triangular cavities ones. The dispersion relation of both modes is measured highlighting their different nature. Plasmonic resonances ranging from near-infrared (IR) to ultraviolet (UV) are obtained by varying the triangle sizes, and especially, we found pseudo-RBMs resonances in the UV region, making them interesting for UV applications.

Journal of Materials Chemistry B, 2017

The present work involves the design of a multifunctional system based on gold nanoshells (AuNSs)... more The present work involves the design of a multifunctional system based on gold nanoshells (AuNSs) decorated with lanthanide-based upconversion nanoparticles (UCNPs) intended as an optical heater and temperature probe at the nanoscale.

Materials Science and Engineering: B, 2003

We have investigated I-V characteristics at very low temperature on a micro-bridge in a Bi-2212 s... more We have investigated I-V characteristics at very low temperature on a micro-bridge in a Bi-2212 single crystal with columnar defects patterned by laser ablation. We have shown that the critical current I C presents a maximum when increasing the applied magnetic field. This maximum is located below the matching field at a filling fraction f = B Max /B = 0.8. The transverse Meissner effect (TME) has also been checked by tilting the magnetic field away from the tracks. Contrary to the low field regime (f < 0.8) where the vortex are strongly localized, the transverse component of the magnetic field is not screened anymore when the parallel one is higher than B Max. It suggests that the vortex system could be considered as a weak Bose glass with interstitial vortices. It suggests that the vortex system could be considered as a weak Bose glass with interstitial vortices. Finally, our results strongly support the existence of a typical vortex phase at low temperature and low magnetic field.

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII, 2011

ABSTRACT We propose a new method of local illumination based on the activation of glass substrate... more ABSTRACT We propose a new method of local illumination based on the activation of glass substrates, enables us to drive fluorescence investigations on biological sample at nanometric scale. This local fluorescence excitation is achieved through a non-radiative energy transfer. We demonstrate the potentiality of our technique through two biological relevant applications: imaging of the cell adhesion points and fluorescence correlation spectroscopy in a sub-diffracted volume (attoliter range).

Nano Letters, 2015

We demonstrate two-color nanoemitters that enable the selection of the dominant emitting waveleng... more We demonstrate two-color nanoemitters that enable the selection of the dominant emitting wavelength by varying the polarization of excitation light. The nanoemitters were fabricated via surface plasmon-triggered two-photon polymerization. By using two polymerizable solutions with different quantum dots, emitters of different colors can be positioned selectively in different orientations in the close vicinity of the metal nanoparticles. The dominant emission wavelength of the metal/polymer anisotropic hybrid nanoemitter thus can be selected by altering the incident polarization.

International audienceThis letter provides a brief summary on early work and developments on both... more International audienceThis letter provides a brief summary on early work and developments on both controlling and studying the optical properties of resonant metal nanoparticles and reports on all progress achieved since two years. Our approach is based on controlled nanoscale photopolymerization triggered by local enhanced electromagnetic fields of silver nanoparticles excited close to their dipolar plasmon resonance. By anisotropic polymerization, symmetry of the refractive index of the surrounding medium was broken: C1v symmetry turned to C2v symmetry. This approach has overcome all the difficulties faced by scanning probe methodologies to reproduce the form of the near field of the localized surface plasmons and provides a new way to quantify its magnitude. Furthermore, this approach leads to the production of polymer/metal hybrid nano-systems of new optical properties

Nanoscale, 2021

The top surface roughness of Al nanodisk has significant influences on the substrate-induced out-... more The top surface roughness of Al nanodisk has significant influences on the substrate-induced out-of-plane quadrupolar mode Q and in-plane dipolar mode D.

Numerous cell mechanisms and pathways rely on dynamic interactions of RNAs or DNAs with proteins ... more Numerous cell mechanisms and pathways rely on dynamic interactions of RNAs or DNAs with proteins that induce local and transient changes in their secondary and tertiary structures. Information on the structure of the protein/nucleic acid complexes is already very well documented thanks to techniques such as X-ray diffraction, NMR or electron microscopy. But their limits are quickly reached when it comes to monitor the dynamics of these interactions. In this case, Fluorescence-based techniques represent the best solution, and given that nucleobases are almost not fluorescent, the introduction of thienoguanosine (thG), a truly faithful emissive and responsive surrogate for Guanosine, represents a breakthrough in our work. Currently we are building a setup which will allow us to perform single molecules experiments with thG labelled oligonucleotides and take advantages of its environment sensitive fluorescence properties. The aim is to report and document thG fluorescence changes during DNA methylation and more precisely to faithfully monitor the base flipping process occurring during this methylation. Complementary to the setup, several steps need to be completed in order to achieve these observations, starting by the functionalization of our quartz slides, to specifically attach thG labelled ODNs to our surface and avoid parasite fluorescence due to the thG excitation wavelength located in the UV range (between 300 and 400 nm). Another important part of our work will be to perform a clear and reproducible activity test on all the proteins involved in the base flipping process (DNMT1, SRA, UHFR1) and a potential production on siteùùùùù;

We report on the imaging of localized electric field on a metal/dielectric interface of gold nano... more We report on the imaging of localized electric field on a metal/dielectric interface of gold nanorods irradiated out of their resonance. The surface polarization charges caused by the discontinuity of electric field at metal/dielectric surface provide a tiny local field enhancement. At some precise positions on the nanorod surface, the resulting effective local field intensity becomes high enough to overcome the threshold dose of a photo-sensitive formulation, and hence the polymerization process is initiated. We finally end up with a cross-linked 3D polymer structure that is actually molding the spatial distribution of the surface charges held on the metal/dielectric interface.

The Journal of Physical Chemistry C, 2020

The plasmon resonances (modes) of a metal nanostructure can be defined as a dipole, a quadrupole,... more The plasmon resonances (modes) of a metal nanostructure can be defined as a dipole, a quadrupole, or high-order modes depending on the surface charge distribution induced by the incident field. In a non-symmetrical environment or clusters, the modes can hybridize and exhibit different behavior and properties. In this work, we study experimentally and numerically the substrate-induced hybridization of plasmonic modes of a silver nanocylinder. The applications of plasmonic nanoparticles such as refractive index sensing and enhanced spectroscopies often rely on the sustained mode spectral position and specific spatial near-field distribution. However, we show that the implementation of such plasmonic nanoparticles in a sensing system can result in a change of the modes nature, its hybridization or dehybridization. These changes are not clearly pronounced in the far-field spectra and then may result in unexpected modifications of the sensor behavior. We show that the hybridization between the dipolar and quadrupolar modes of the plasmonic nanoparticle on the substrate results from quadrupolar mode excitation due to the superposition of the reflected and incoming light and, then, depends on the reflection of the substrate. The existence of the hybridized modes strongly depends on the surrounding environment of nanoparticles, and after the deposition of the nanometric polymer layer on top of the nanoparticle the hybridized modes vanish and are replaced by uncoupled multipolar resonances.

The Journal of Physical Chemistry C, 2021

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires

ACS Applied Materials & Interfaces, 2021

Temperature characterization and quantification at the nanoscale remain core challenges in applic... more Temperature characterization and quantification at the nanoscale remain core challenges in applications based on photoinduced heating of nanoparticles. Here, we propose a new approach to obtain quantitative temperature measurements on individual nanoparticles by combining modulated photothermal stimulation and heterodyne digital holography. From full-field reconstructed holograms, temperature is determined with a precision of 0.3 K via a simple approach without requiring any calibration or fitting parameters. As an application, the dependence of temperature on the aspect ratio of gold nanoparticles is investigated. A good agreement with numerical simulation is observed.

Optics Express, 2021

A single metallic nanodisk is the simplest plasmonic nanostructure, but it is robust enough to ge... more A single metallic nanodisk is the simplest plasmonic nanostructure, but it is robust enough to generate a Fano resonance in the forward and backward scattering spectra by the increment of nanodisk height in the symmetric and asymmetric dielectric environment. Thanks to the phase retardation effect, the non-uniform distribution of electric field along the height of aluminum (Al) nanodisk generates the out-of-plane higher-order modes, which interfere with the dipolar mode and subsequently result in the Fano-lineshape scattering spectra. Meanwhile, the symmetry-breaking effect by the dielectric substrate and the increment of refractive index of the symmetric dielectric environment further accelerate the phase retardation effect and contribute to the appearance of out-of-plane modes. The experimental results on the periodic Al nanodisk arrays with different heights confirm the retardation-induced higher modes in the asymmetric and symmetric environment. The appearance of higher modes an...

Nature Communications, 2020

Hybrid plasmonic nano-emitters based on the combination of quantum dot emitters (QD) and plasmoni... more Hybrid plasmonic nano-emitters based on the combination of quantum dot emitters (QD) and plasmonic nanoantennas open up new perspectives in the control of light. However, precise positioning of any active medium at the nanoscale constitutes a challenge. Here, we report on the optimal overlap of antenna’s near-field and active medium whose spatial distribution is controlled via a plasmon-triggered 2-photon polymerization of a photosensitive formulation containing QDs. Au nanoparticles of various geometries are considered. The response of these hybrid nano-emitters is shown to be highly sensitive to the light polarization. Different light emission states are evidenced by photoluminescence measurements. These states correspond to polarization-sensitive nanoscale overlap between the exciting local field and the active medium distribution. The decrease of the QD concentration within the monomer formulation allows trapping of a single quantum dot in the vicinity of the Au particle. The la...

Journal of Physics: Conference Series, 2020

The present paper aims at introducing preliminary results about the magnetoplasmonic properties o... more The present paper aims at introducing preliminary results about the magnetoplasmonic properties of bimetallic nanorods. Our study seems confirming that the Localized Surface Plasmon Resonance (LSPR) wavelength of such structures could be tuned by applying an external magnetic field, which could open new perspectives of applications.

Advances in Materials Science and Engineering, 2019

The scattering and absorption efficiencies of light by a single silicon/silica/gold spherical mul... more The scattering and absorption efficiencies of light by a single silicon/silica/gold spherical multishell in biological tissues are analyzed theoretically in the framework of Lorenz–Mie theory and finite-difference time-domain formalism. We first revised the ideal case of a concentric silicon/gold nanoshell, analyzed the effect of growing a silica layer of uniform thickness around the silicon core, and then examined the effect of an offset of the gold shell with respect to the centre of the silicon/silica nanoshell. Our simulation showed that the silicon/gold nanoshell in the biological tissue supports significant absorption and scattering resonances in the biological spectral window. On the contrary, the growth of a silica layer on the silicon core surface leads to a blueshift of these resonances accompanied by a slight increase of their magnitudes. The offset of the gold shell with respect to the silicon/silica core results in a redshift of the absorption and scattering resonances ...

Optical Materials Express, 2018

Aluminum is now regarded as one of the best metals for pushing plasmonics towards ultraviolet. Wh... more Aluminum is now regarded as one of the best metals for pushing plasmonics towards ultraviolet. When exposed to air, a 3-5 nm alumina shell is formed rapidly around aluminum, preventing further oxygen penetration. This natural oxidation layer is known to chemically stabilize Al. Nevertheless, due to the large surface to volume ratio of Al nanoparticles, their long-term stability is an issue, especially when they are polycrystalline. This critical point has to be developed as the optical properties of conventionally evaporated Al nanostructures may evolve over time. In this article, the evolution of the plasmonic properties sustained by Al nanodisks with a varying oxidation layer is studied by numerical calculations. Their stability over time is also experimentally monitored over 250 days. When exposed to ambient air, their optical properties are preserved for 90 days whatever their diameter, due to a very slight oxidation. Beyond this period, the nanodisks lose their optical properties more or less rapidly depending, this time, on their diameter. A competition between oxidation and self-annealing is proposed in order to explain these results. Nanodisks with a particular diameter of 100 nm are surprisingly stable, exhibiting plasmonic resonances lasting over 250 days. Additionally, when Al nanodisks are exposed to a water environment, a strong corrosion effect shortens their lifetime to 5 days. The obtained results are of importance for further use of conventionally evaporated Al nanostructures for optical applications, as they should remain stable over a long period of time.

Organic Electronics, 2019

Highly efficient and foldable top-emission organic lightemitting diodes based on Ag-nanoparticles... more Highly efficient and foldable top-emission organic lightemitting diodes based on Ag-nanoparticles modified graphite electrode, Organic Electronics (2018), doi:

Physical Review B, 2017

Aluminum nanostructures have recently been at the focus of numerous studies due to their properti... more Aluminum nanostructures have recently been at the focus of numerous studies due to their properties including oxidation stability and surface plasmon resonances covering the ultraviolet and visible spectral windows. In this article, we reveal a new facet of this metal relevant for both plasmonics purpose and photo-thermal conversion. The field distribution of high order plasmonic resonances existing in two-dimensional Al structures is studied by nonlinear photoluminescence (nPL) microscopy in a spectral region where electronic interband transitions occur. The polarization sensitivity of the field intensity maps shows that the electric field concentration can be addressed and controlled ondemand. We use a numerical tool based on the Green dyadic method to analyze our results and to simulate the absorbed energy that is locally converted into heat. The polarization-dependent temperature increase of the Al structures is experimentally quantitatively measured, and is in an excellent agreement with theoretical predictions. Our work highlights Al as a promising candidate for designing thermal nanosources integrated in coplanar geometries for thermally assisted nanomanipulation or biophysical applications.

ACS Photonics, 2017

We use electron energy loss spectroscopy (EELS) to perform a comprehensive spectroscopy and mappi... more We use electron energy loss spectroscopy (EELS) to perform a comprehensive spectroscopy and mapping of the plasmonic modes sustained by aluminum nanotriangles. Behind the apparent simplicity of such structures, a rich variety of plasmonic modes is observed. Edge modes and pseudoradial breathing modes (pseudo-RBMs) are unveiled as they couple efficiently with the electron source. We propose analytical models confirmed by rigorous simulations to index both families of modes and describe their spatial symmetry. Edge modes could be indexed as nanoantenna modes, while pseudo-RBMs match triangular cavities ones. The dispersion relation of both modes is measured highlighting their different nature. Plasmonic resonances ranging from near-infrared (IR) to ultraviolet (UV) are obtained by varying the triangle sizes, and especially, we found pseudo-RBMs resonances in the UV region, making them interesting for UV applications.

Journal of Materials Chemistry B, 2017

The present work involves the design of a multifunctional system based on gold nanoshells (AuNSs)... more The present work involves the design of a multifunctional system based on gold nanoshells (AuNSs) decorated with lanthanide-based upconversion nanoparticles (UCNPs) intended as an optical heater and temperature probe at the nanoscale.

Materials Science and Engineering: B, 2003

We have investigated I-V characteristics at very low temperature on a micro-bridge in a Bi-2212 s... more We have investigated I-V characteristics at very low temperature on a micro-bridge in a Bi-2212 single crystal with columnar defects patterned by laser ablation. We have shown that the critical current I C presents a maximum when increasing the applied magnetic field. This maximum is located below the matching field at a filling fraction f = B Max /B = 0.8. The transverse Meissner effect (TME) has also been checked by tilting the magnetic field away from the tracks. Contrary to the low field regime (f < 0.8) where the vortex are strongly localized, the transverse component of the magnetic field is not screened anymore when the parallel one is higher than B Max. It suggests that the vortex system could be considered as a weak Bose glass with interstitial vortices. It suggests that the vortex system could be considered as a weak Bose glass with interstitial vortices. Finally, our results strongly support the existence of a typical vortex phase at low temperature and low magnetic field.

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII, 2011

ABSTRACT We propose a new method of local illumination based on the activation of glass substrate... more ABSTRACT We propose a new method of local illumination based on the activation of glass substrates, enables us to drive fluorescence investigations on biological sample at nanometric scale. This local fluorescence excitation is achieved through a non-radiative energy transfer. We demonstrate the potentiality of our technique through two biological relevant applications: imaging of the cell adhesion points and fluorescence correlation spectroscopy in a sub-diffracted volume (attoliter range).

Nano Letters, 2015

We demonstrate two-color nanoemitters that enable the selection of the dominant emitting waveleng... more We demonstrate two-color nanoemitters that enable the selection of the dominant emitting wavelength by varying the polarization of excitation light. The nanoemitters were fabricated via surface plasmon-triggered two-photon polymerization. By using two polymerizable solutions with different quantum dots, emitters of different colors can be positioned selectively in different orientations in the close vicinity of the metal nanoparticles. The dominant emission wavelength of the metal/polymer anisotropic hybrid nanoemitter thus can be selected by altering the incident polarization.