Efficient plasmonic emission by the quantum Čerenkov effect from hot carriers in graphene

Kaminer, Ido and Katan, Yaniv Tenenbaum and Buljan, Hrvoje and Shen, Yichen and Ilić, Ognjen and López, Josué J. and Wong, Liang Jie and Joannopoulos, John D. and Soljačić, Marin (2016) Efficient plasmonic emission by the quantum Čerenkov effect from hot carriers in graphene. Nature Communications, 7. Art.No.11880. ISSN 2041-1723

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Graphene plasmons have been found to be an exciting plasmonic platform, thanks to their high field confinement and low phase velocity, motivating contemporary research to revisit established concepts in light–matter interaction. In a conceptual breakthrough over 80 years old, Čerenkov showed how charged particles emit shockwaves of light when moving faster than the phase velocity of light in a medium. To modern eyes, the Čerenkov effect offers a direct and ultrafast energy conversion scheme from charge particles to photons. The requirement for relativistic particles, however, makes Čerenkov emission inaccessible to most nanoscale electronic and photonic devices. Here we show that graphene plasmons provide the means to overcome this limitation through their low phase velocity and high field confinement. The interaction between the charge carriers flowing inside graphene and the plasmons enables a highly efficient two-dimensional Čerenkov emission, giving a versatile, tunable and ultrafast conversion mechanism from electrical signal to plasmonic excitation.

Item Type: Article
Date: 13 June 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: This work is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/). The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material.
Divisions: Faculty of Science > Department of Physics
Publisher: Nature Publishing Group
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 30 Oct 2017 17:02
Last Modified: 30 Nov 2017 12:27
URI: http://digre.pmf.unizg.hr/id/eprint/5649

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