Michele Dipalo - Academia.edu (original) (raw)

Papers by Michele Dipalo

Research paper thumbnail of Spatially, Temporally, and Quantitatively Controlled Delivery of Broad Range of Molecules into Selected Cells through Plasmonic Nanotubes

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.

Research paper thumbnail of Multifunctional biosensing with three-dimensional plasmonic nanoantennas

Bio-MEMS and Medical Microdevices II, 2015

Research paper thumbnail of Hollow plasmonic antennas for broadband SERS spectroscopy

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.

Research paper thumbnail of Nanocrystalline diamond growth and device applications

Research paper thumbnail of Micromotors with asymmetric shape that efficiently convert light into work by thermocapillary effects

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.

Research paper thumbnail of High power nanocrystalline diamond RF MEMS- A combined look at mechanical and microwave properties

2008 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems, 2008

Research paper thumbnail of Out-of-Plane Plasmonic Antennas for Raman Analysis in Living Cells

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.

Research paper thumbnail of Stacked optical antennas for plasmon propagation in a 5 nm-confined cavity

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.

Research paper thumbnail of Fabrication of ZnO nanoflowers on gold coated pillars

Microelectronic Engineering, 2015

Research paper thumbnail of Thick nano-crystalline diamond overgrowth on InAlN/GaN devices for thermal management

2009 Device Research Conference, 2009

Research paper thumbnail of Hollow plasmonic antennas for broadband SERS spectroscopy

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.

Research paper thumbnail of Chemical sensor on daimond film

Research paper thumbnail of Chemischer Sensor auf Diamantschichten

Research paper thumbnail of Semiconductor device and method for manufacturing a semiconductor device

Research paper thumbnail of III-V nitride semiconductor device comprising a diamond layer

Research paper thumbnail of High power nanocrystalline diamond RF MEMS-A combined look at mechanical and microwave properties

Research paper thumbnail of Nanodiamond microbridges for RF applications

Research paper thumbnail of InAlN/GaN heterostructures for microwave power and beyond

2009 IEEE International Electron Devices Meeting (IEDM), 2009

Research paper thumbnail of Micro-/Nano-Technologies and Microelectronics for Neuroscience Research and Applications

Research paper thumbnail of 3D plasmonic hollow nanoantennas as tools for neuroscience applications

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.

Research paper thumbnail of Spatially, Temporally, and Quantitatively Controlled Delivery of Broad Range of Molecules into Selected Cells through Plasmonic Nanotubes

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.

Research paper thumbnail of Multifunctional biosensing with three-dimensional plasmonic nanoantennas

Bio-MEMS and Medical Microdevices II, 2015

Research paper thumbnail of Hollow plasmonic antennas for broadband SERS spectroscopy

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.

Research paper thumbnail of Nanocrystalline diamond growth and device applications

Research paper thumbnail of Micromotors with asymmetric shape that efficiently convert light into work by thermocapillary effects

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.

Research paper thumbnail of High power nanocrystalline diamond RF MEMS- A combined look at mechanical and microwave properties

2008 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems, 2008

Research paper thumbnail of Out-of-Plane Plasmonic Antennas for Raman Analysis in Living Cells

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.

Research paper thumbnail of Stacked optical antennas for plasmon propagation in a 5 nm-confined cavity

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.

Research paper thumbnail of Fabrication of ZnO nanoflowers on gold coated pillars

Microelectronic Engineering, 2015

Research paper thumbnail of Thick nano-crystalline diamond overgrowth on InAlN/GaN devices for thermal management

2009 Device Research Conference, 2009

Research paper thumbnail of Hollow plasmonic antennas for broadband SERS spectroscopy

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.

Research paper thumbnail of Chemical sensor on daimond film

Research paper thumbnail of Chemischer Sensor auf Diamantschichten

Research paper thumbnail of Semiconductor device and method for manufacturing a semiconductor device

Research paper thumbnail of III-V nitride semiconductor device comprising a diamond layer

Research paper thumbnail of High power nanocrystalline diamond RF MEMS-A combined look at mechanical and microwave properties

Research paper thumbnail of Nanodiamond microbridges for RF applications

Research paper thumbnail of InAlN/GaN heterostructures for microwave power and beyond

2009 IEEE International Electron Devices Meeting (IEDM), 2009

Research paper thumbnail of Micro-/Nano-Technologies and Microelectronics for Neuroscience Research and Applications

Research paper thumbnail of 3D plasmonic hollow nanoantennas as tools for neuroscience applications

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.