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Title: Broadband enhancement of cherenkov radiation using dispersionless plasmons
Authors: Hu, Hao
Lin, Xiao
Liu, Dongjue
Chen, Hongsheng
Zhang, Baile
Luo, Yu
Issue Date: 2022
Source: Hu, H., Lin, X., Liu, D., Chen, H., Zhang, B. & Luo, Y. (2022). Broadband enhancement of cherenkov radiation using dispersionless plasmons. Advanced Science, 9(26), e2200538-.
Project: MOE 2018-T2-2-189 (S) 
MOE2018-T2-1-022 (S) 
NRF-CRP22-2019- 0006 
Journal: Advanced Science 
Abstract: As one of leading technologies in detecting relativistic particles, Cherenkov radiation plays an essential role in modern high-energy and particle physics. However, the limited photon yield in transparent dielectrics makes efficient Cherenkov radiation only possible with high-energy particles (at least several MeV). This restriction hinders applications of Cherenkov radiation in free-electron light source, bio-imaging, medical therapy, etc. Broadband enhancement of Cherenkov radiation is highly desired for all these applications, but still widely acknowledged as a scientific challenge. To this end, we report a general approach to enhance the photon yield of Cherenkov radiation using dispersionless plasmons. Broadband dispersionless plasmons can be realized by exploiting either the acoustic nature of terahertz plasmons in a graphene-based heterostructure or the nonlocal property of optical plasmons in a metallodielectric structure. When coupled to moving electrons, such dispersionless plasmons give rise to a radiation enhancement rate more than two orders of magnitude (as compared with conventional Cherenkov radiation) over an ultrabroad frequency band. Moreover, since the phase velocity of dispersionless plasmons can be made as small as the Fermi velocity, giant radiation enhancements can be readily induced by ultralow-energy free electrons (e.g. with a kinetic energy down to 3 electronvolts), without resorting to relativistic particles.
ISSN: 2198-3844
DOI (Related Dataset): 10.21979/N9/KTP1QL
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2022 The Authors. Advanced Science published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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