Spectrometer-free electron probe of ultrafast thermal dynamics in optically excited samples

Vahagn Mkhitaryan; Eduardo Dias; Fabrizio Carbone; Javier García de Abajo

doi:10.1364/CLEO_QELS.2021.FTh1K.3

Conference on Lasers and Electro-Optics
OSA Technical Digest (Optica Publishing Group, 2021),
paper FTh1K.3
•https://doi.org/10.1364/CLEO_QELS.2021.FTh1K.3

Spectrometer-free electron probe of ultrafast thermal dynamics in optically excited samples

Vahagn Mkhitaryan, Eduardo Dias, Fabrizio Carbone, and Javier García de Abajo

CLEO: QELS_Fundamental Science 2021

San Jose, California United States
9–14 May 2021
ISBN: 978-1-943580-91-0

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Near-field Imaging and Enhanced Sensing (FTh1K)

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V. Mkhitaryan, E. Dias, F. Carbone, and J. G. de Abajo, "Spectrometer-free electron probe of ultrafast thermal dynamics in optically excited samples," in Conference on Lasers and Electro-Optics, J. Kang, S. Tomasulo, I. Ilev, D. Müller, N. Litchinitser, S. Polyakov, V. Podolskiy, J. Nunn, C. Dorrer, T. Fortier, Q. Gan, and C. Saraceno, eds., OSA Technical Digest (Optica Publishing Group, 2021), paper FTh1K.3.

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Abstract

Cutting edge electron microscopes allow to probe the optical excitations in nanostructures with subangstrom spatial and femtosecond temporal resolution. In this study we discuss the prospects of probing the ultrafast out-of-equilibrium dynamics of plasmonic excitations in graphene and graphite samples. We show that, the plasmon excitation dynamics in nanostructured graphene and graphite can be traced through energy integrated and momentum resolved spectra of inelastically scattered electrons in contrast to more traditional energy-resolved spectroscopy approach, where highly-monochromatized electron beams and electron spectrometers with sufficient energy resolutions are essential.

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