Michele Dipalo - Academia.edu (original) (raw)
Papers by Michele Dipalo
Advanced materials (Deerfield Beach, Fla.), Jan 7, 2015
Universal plasmonic/microfluidic platform for spatial and temporal controlled intracellular deliv... more Universal plasmonic/microfluidic platform for spatial and temporal controlled intracellular delivery: The system can inject/transfect the desired amount of molecule with an efficacy close to 100%. Moreover, it is highly scalable from single cells to large ensembles without administering the molecule to the extracellular bath. The latter enables quantitative control over the amount of injected molecules.
Bio-MEMS and Medical Microdevices II, 2015
Beilstein Journal of Nanotechnology, 2015
The chemical environment of cells is an extremely complex and multifaceted system that includes m... more The chemical environment of cells is an extremely complex and multifaceted system that includes many types of proteins, lipids, nucleic acids and various other components. With the final aim of studying these components in detail, we have developed multiband plasmonic antennas, which are suitable for highly sensitive surface enhanced Raman spectroscopy (SERS) and are activated by a wide range of excitation wavelengths. The three-dimensional hollow nanoantennas were produced on an optical resist by a secondary electron lithography approach, generated by fast ion-beam milling on the polymer and then covered with silver in order to obtain plasmonic functionalities. The optical properties of these structures have been studied through finite element analysis simulations that demonstrated the presence of broadband absorption and multiband enhancement due to the unusual geometry of the antennas. The enhancement was confirmed by SERS measurements, which showed a large enhancement of the vibrational features both in the case of resonant excitation and out-of-resonance excitation. Such characteristics indicate that these structures are potential candidates for plasmonic enhancers in multifunctional opto-electronic biosensors.
Nature communications, 2015
The direct conversion of light into work allows the driving of micron-sized motors in a contactle... more The direct conversion of light into work allows the driving of micron-sized motors in a contactless, controllable and continuous way. Light-to-work conversion can involve either direct transfer of optical momentum or indirect opto-thermal effects. Both strategies have been implemented using different coupling mechanisms. However, the resulting efficiencies are always very low, and high power densities, generally obtained by focused laser beams, are required. Here we show that microfabricated gears, sitting on a liquid-air interface, can efficiently convert absorbed light into rotational motion through a thermocapillary effect. We demonstrate rotation rates up to 300 r.p.m. under wide-field illumination with incoherent light. Our analysis shows that thermocapillary propulsion is one of the strongest mechanisms for light actuation at the micron- and nanoscale.
2008 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems, 2008
Small (Weinheim an der Bergstrasse, Germany), Jan 26, 2015
Out-of-plane plasmonic nanoantennas protruding from the substrate are exploited to perform very s... more Out-of-plane plasmonic nanoantennas protruding from the substrate are exploited to perform very sensitive surface enhanced Raman scattering analysis of living cells. Cells cultured on three-dimensional surfaces exhibit tight adhesion with nanoantenna tips where the plasmonic hot-spot resides. This fact provides observable cell adhesion sites combined with high plasmonic enhancement, resulting in an ideal system for Raman investigation of cell membranes.
Scientific reports, 2015
The sub-wavelength concentration and propagation of electromagnetic energy are two complementary ... more The sub-wavelength concentration and propagation of electromagnetic energy are two complementary aspects of plasmonics that are not necessarily co-present in a single nanosystem. Here we exploit the strong nanofocusing properties of stacked optical antennas in order to highly concentrate the electromagnetic energy into a 5 nm metal-insulator-metal (MIM) cavity and convert free radiation into guided modes. The proposed nano-architecture combines the concentration properties of optical nanoantennas with the propagation capability of MIM systems, paving the way to highly miniaturized on-chip plasmonic waveguiding.
Microelectronic Engineering, 2015
2009 Device Research Conference, 2009
Beilstein Journal of Nanotechnology, 2015
The chemical environment of cells is an extremely complex and multifaceted system that includes m... more The chemical environment of cells is an extremely complex and multifaceted system that includes many types of proteins, lipids, nucleic acids and various other components. With the final aim of studying these components in detail, we have developed multiband plasmonic antennas, which are suitable for highly sensitive surface enhanced Raman spectroscopy (SERS) and are activated by a wide range of excitation wavelengths. The three-dimensional hollow nanoantennas were produced on an optical resist by a secondary electron lithography approach, generated by fast ion-beam milling on the polymer and then covered with silver in order to obtain plasmonic functionalities. The optical properties of these structures have been studied through finite element analysis simulations that demonstrated the presence of broadband absorption and multiband enhancement due to the unusual geometry of the antennas. The enhancement was confirmed by SERS measurements, which showed a large enhancement of the vibrational features both in the case of resonant excitation and out-of-resonance excitation. Such characteristics indicate that these structures are potential candidates for plasmonic enhancers in multifunctional opto-electronic biosensors.
2009 IEEE International Electron Devices Meeting (IEDM), 2009
CLEO: 2014, 2014
ABSTRACT 3D plasmonic nanoantennas were fabricated on active biodevices for in-vitro neuroscience... more ABSTRACT 3D plasmonic nanoantennas were fabricated on active biodevices for in-vitro neuroscience experiments. The technique consents to realize nanoantennas patterns suitable for neurons culture and that can be used concurrently as intracellular nanoelectrodes and spectroscopic probes.
Advanced materials (Deerfield Beach, Fla.), Jan 7, 2015
Universal plasmonic/microfluidic platform for spatial and temporal controlled intracellular deliv... more Universal plasmonic/microfluidic platform for spatial and temporal controlled intracellular delivery: The system can inject/transfect the desired amount of molecule with an efficacy close to 100%. Moreover, it is highly scalable from single cells to large ensembles without administering the molecule to the extracellular bath. The latter enables quantitative control over the amount of injected molecules.
Bio-MEMS and Medical Microdevices II, 2015
Beilstein Journal of Nanotechnology, 2015
The chemical environment of cells is an extremely complex and multifaceted system that includes m... more The chemical environment of cells is an extremely complex and multifaceted system that includes many types of proteins, lipids, nucleic acids and various other components. With the final aim of studying these components in detail, we have developed multiband plasmonic antennas, which are suitable for highly sensitive surface enhanced Raman spectroscopy (SERS) and are activated by a wide range of excitation wavelengths. The three-dimensional hollow nanoantennas were produced on an optical resist by a secondary electron lithography approach, generated by fast ion-beam milling on the polymer and then covered with silver in order to obtain plasmonic functionalities. The optical properties of these structures have been studied through finite element analysis simulations that demonstrated the presence of broadband absorption and multiband enhancement due to the unusual geometry of the antennas. The enhancement was confirmed by SERS measurements, which showed a large enhancement of the vibrational features both in the case of resonant excitation and out-of-resonance excitation. Such characteristics indicate that these structures are potential candidates for plasmonic enhancers in multifunctional opto-electronic biosensors.
Nature communications, 2015
The direct conversion of light into work allows the driving of micron-sized motors in a contactle... more The direct conversion of light into work allows the driving of micron-sized motors in a contactless, controllable and continuous way. Light-to-work conversion can involve either direct transfer of optical momentum or indirect opto-thermal effects. Both strategies have been implemented using different coupling mechanisms. However, the resulting efficiencies are always very low, and high power densities, generally obtained by focused laser beams, are required. Here we show that microfabricated gears, sitting on a liquid-air interface, can efficiently convert absorbed light into rotational motion through a thermocapillary effect. We demonstrate rotation rates up to 300 r.p.m. under wide-field illumination with incoherent light. Our analysis shows that thermocapillary propulsion is one of the strongest mechanisms for light actuation at the micron- and nanoscale.
2008 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems, 2008
Small (Weinheim an der Bergstrasse, Germany), Jan 26, 2015
Out-of-plane plasmonic nanoantennas protruding from the substrate are exploited to perform very s... more Out-of-plane plasmonic nanoantennas protruding from the substrate are exploited to perform very sensitive surface enhanced Raman scattering analysis of living cells. Cells cultured on three-dimensional surfaces exhibit tight adhesion with nanoantenna tips where the plasmonic hot-spot resides. This fact provides observable cell adhesion sites combined with high plasmonic enhancement, resulting in an ideal system for Raman investigation of cell membranes.
Scientific reports, 2015
The sub-wavelength concentration and propagation of electromagnetic energy are two complementary ... more The sub-wavelength concentration and propagation of electromagnetic energy are two complementary aspects of plasmonics that are not necessarily co-present in a single nanosystem. Here we exploit the strong nanofocusing properties of stacked optical antennas in order to highly concentrate the electromagnetic energy into a 5 nm metal-insulator-metal (MIM) cavity and convert free radiation into guided modes. The proposed nano-architecture combines the concentration properties of optical nanoantennas with the propagation capability of MIM systems, paving the way to highly miniaturized on-chip plasmonic waveguiding.
Microelectronic Engineering, 2015
2009 Device Research Conference, 2009
Beilstein Journal of Nanotechnology, 2015
The chemical environment of cells is an extremely complex and multifaceted system that includes m... more The chemical environment of cells is an extremely complex and multifaceted system that includes many types of proteins, lipids, nucleic acids and various other components. With the final aim of studying these components in detail, we have developed multiband plasmonic antennas, which are suitable for highly sensitive surface enhanced Raman spectroscopy (SERS) and are activated by a wide range of excitation wavelengths. The three-dimensional hollow nanoantennas were produced on an optical resist by a secondary electron lithography approach, generated by fast ion-beam milling on the polymer and then covered with silver in order to obtain plasmonic functionalities. The optical properties of these structures have been studied through finite element analysis simulations that demonstrated the presence of broadband absorption and multiband enhancement due to the unusual geometry of the antennas. The enhancement was confirmed by SERS measurements, which showed a large enhancement of the vibrational features both in the case of resonant excitation and out-of-resonance excitation. Such characteristics indicate that these structures are potential candidates for plasmonic enhancers in multifunctional opto-electronic biosensors.
2009 IEEE International Electron Devices Meeting (IEDM), 2009
CLEO: 2014, 2014
ABSTRACT 3D plasmonic nanoantennas were fabricated on active biodevices for in-vitro neuroscience... more ABSTRACT 3D plasmonic nanoantennas were fabricated on active biodevices for in-vitro neuroscience experiments. The technique consents to realize nanoantennas patterns suitable for neurons culture and that can be used concurrently as intracellular nanoelectrodes and spectroscopic probes.