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14 results on '"Fatti, Natalia del"'

3. Experimental Measurement of the Thermal Boundary Resistance at the Interface of Carbon Nanotubes with Ultrafast Optical Spectroscopy*

Author

Casto, Alessandro, primary, Vittucci, Margherita, additional, Bellussi, Francesco Maria, additional, Diego, Michele, additional, Vialla, Fabien, additional, Crut, Aurelien, additional, Fasano, Matteo, additional, Vallée, Fabrice, additional, Fatti, Natalia Del, additional, Banfi, Francesco, additional, and Maioli, Paolo, additional

Published
2023
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4. Optically active cross-band transition in double-walled carbon nanotube and its impact on Raman resonances

Author

Agence Nationale de la Recherche (France), Universidad de Zaragoza, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Diputación General de Aragón, European Commission, Gobierno de Aragón, Bulgarian National Science Fund, Paillet, Matthieu, Popov, Valentin N., Tran, Huy Nam, Blancon, Jean Christophe, Levshov, Dmitry I., Arenal, Raúl, Parret, Romain, Ayari, Anthony, San Miguel, Alfonso, Vallèe, Fabrice G., Fatti, Natalia del, Zahab, Ahmed Azmi, Sauvajol, Jean Louis, Agence Nationale de la Recherche (France), Universidad de Zaragoza, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Diputación General de Aragón, European Commission, Gobierno de Aragón, Bulgarian National Science Fund, Paillet, Matthieu, Popov, Valentin N., Tran, Huy Nam, Blancon, Jean Christophe, Levshov, Dmitry I., Arenal, Raúl, Parret, Romain, Ayari, Anthony, San Miguel, Alfonso, Vallèe, Fabrice G., Fatti, Natalia del, Zahab, Ahmed Azmi, and Sauvajol, Jean Louis

Abstract

Double-walled carbon nanotubes (DWNTs), often regarded as the simplest one-dimensional (1D) van der Waals moiré superlattices, are the ideal structures to explore the interlayer coupling, including mechanical and electronical coupling, at the nanoscale in 1D systems. By combining spatial modulation spectroscopy (SMS) and resonant Raman scattering (RRS) experiments on well-identified individual free-standing DWNTs with the calculations of their optical absorption by using the recursion method with non-orthogonal tight-binding (NTB) basis functions, we are able to unambiguously assign the nature, namely mirror transition or cross transition, of each optical transitions in DWNTs. Our study identifies and allows to determine the conditions of the mixing of the electronic states leading to the appearance of cross transitions in the optical absorption of DWNTs, beyond of the so-called Koshino's criteria previously derived. On the other hand, the striking behavior of the resonant excitation profile (REP) of the Raman active modes around the cross transition reveals the strong sensitivity of the modes intensity on the electronic interlayer coupling in DWNTs, emphasizing the relevance of Raman spectroscopy for studying the electronic and mechanical coupling at the nanoscale.

Published
2022

6. Ultrafast electron dynamics and optical nonlinearities in metal nanoparticles

Author

Voisin, Christophe, Fatti, Natalia Del, Christofilos, Dimitris, and Vallee, Fabrice

Subjects
Chemistry, Physical and theoretical -- Research, Electrons -- Research, Metallic elements -- Electric properties, Metallic elements -- Optical properties, Chemicals, plastics and rubber industries
Abstract

The results of high-sensitivity femtosecond pump-probe experiments are used for discussing the femtosecond optical response of noble metal nanoparticles and its connection to the ultrafast electron dynamics. It is observed that the electron-electron energy exchanges are not affected by confinement for sizes larger than 10nm.

Published
2001

7. Surface Plasmon Resonance of an Individual Nano-Object on an Absorbing Substrate: Quantitative Effects of Distance and 3D Orientation

Author

Pertreux, Etienne, primary, Lombardi, Anna, additional, Florea, Ileana, additional, Spuch-Calvar, Miguel, additional, Gómez-Graña, Sergio, additional, Ihiawakrim, Dris, additional, Hirlimann, Charles, additional, Ersen, Ovidiu, additional, Majimel, Jérôme, additional, Tréguer-Delapierre, Mona, additional, Hettich, Mike, additional, Maioli, Paolo, additional, Crut, Aurélien, additional, Vallée, Fabrice, additional, and Fatti, Natalia Del, additional

Published
2015
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8. Direct measurement of the absolute absorption spectrum of individual semiconducting single-wall carbon nanotubes

Author

Blancon, Jean-Christophe, primary, Paillet, Matthieu, additional, Tran, Huy Nam, additional, Than, Xuan Tinh, additional, Guebrou, Samuel Aberra, additional, Ayari, Anthony, additional, Miguel, Alfonso San, additional, Phan, Ngoc-Minh, additional, Zahab, Ahmed-Azmi, additional, Sauvajol, Jean-Louis, additional, Fatti, Natalia Del, additional, and Vallée, Fabrice, additional

Published
2013
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10. Surface Plasmon Resonance of an Individual Nano‐Object on an Absorbing Substrate: Quantitative Effects of Distance and 3D Orientation.

Author

Pertreux, Etienne, Lombardi, Anna, Florea, Ileana, Spuch‐Calvar, Miguel, Gómez‐Graña, Sergio, Ihiawakrim, Dris, Hirlimann, Charles, Ersen, Ovidiu, Majimel, Jérôme, Tréguer‐Delapierre, Mona, Hettich, Mike, Maioli, Paolo, Crut, Aurélien, Vallée, Fabrice, and Fatti, Natalia Del

Abstract

Modification of the plasmonic response of a metal nano‐object due to interaction with a substrate is experimentally investigated measuring the quantitative optical extinction spectra of individual nano‐objects with various elongated shapes (bipyramids and rods) deposited on a dielectric (silica) or absorbing (carbon) membrane. Apart from the expected dependence of the nanoparticle surface plasmon resonance (SPR) frequency on the nature of the substrate, large substrate and particle shape dependent modifications of its SPR width are demonstrated. These dependencies are ascribed to strong localization of the electromagnetic field associated with the longitudinal SPR of an elongated nano‐object around its tips, leading to different interaction with the substrate depending on the particle shape and 3D orientation relative to the substrate. Both parameters have been precisely determined by electron tomography, permitting excellent reproduction of the experimental data. Experiments performed on silver‐encapsulated bipyramids, whose shape evolves from a pyramidal one towards a cylindrical one, further confirm this effect. [ABSTRACT FROM AUTHOR]

Published
2016
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