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7 March 2022 All-optical excitation and ultrafast modulation of plasmons in 2D materials
Eduardo J. C. Dias, Renwen Yu, F. Javier García de Abajo
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Proceedings Volume PC11999, Ultrafast Phenomena and Nanophotonics XXVI; PC119990M (2022) https://doi.org/10.1117/12.2609477
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
In this work, we take advantage of the strong temperature modulation of the graphene conductivity to propose an all-optical technique of excitation and manipulation of plasmons in graphene and thin metallic films, via the spatial patterning of the temperature of electrons in a graphene film, which can diffract a probe beam and directly excite plasmons. Additionally, we demonstrate the ability of graphene, thin metals films, and graphene-metal hybrid systems to undergo photothermal optical modulation with depth as large as >70% over a wide spectral range extending from the visible to the terahertz spectral domains. We envision the use of ultrafast pump laser pulses to raise the electron temperature of graphene during a picosecond timescale in which its mid-infrared plasmon resonances undergo dramatic shifts and broadenings, while visible and near-infrared plasmons in neighbouring metal films are severely attenuated by the presence of hot graphene electrons.
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Eduardo J. C. Dias, Renwen Yu, and F. Javier García de Abajo "All-optical excitation and ultrafast modulation of plasmons in 2D materials", Proc. SPIE PC11999, Ultrafast Phenomena and Nanophotonics XXVI, PC119990M (7 March 2022); https://doi.org/10.1117/12.2609477
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KEYWORDS
Plasmons
Graphene
Modulation
Metals
Ultrafast imaging
Photothermal effect
Acoustics
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