Journal
NANOPHOTONICS
Volume 9, Issue 10, Pages 3435-3442Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0135
Keywords
Cherenkov radiation; light-matter interaction; metamaterials; plasmonics; spatial nonlocality
Categories
Funding
- Singapore Ministry of Education [MOE2018-T2-2-189 (S), MOE2017-T1-001-239 (RG91/17 (S))]
- A*STAR AME programmatic Grant [A18A7b0058]
- Ministry of Education, Singapore [MOE2016-T2-2-159, MOE2018-T2-1-176]
- National Research Foundation Singapore, Competitive Research Program [NRF-CRP18-2017-02]
- National Natural Science Foundation of China [11504252]
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Cherenkov radiation in natural transparent materials is generally forward-propagating, owing to the positive group index of radiation modes. While negative-index metamaterials enable reversed Cherenkov radiation, the forward photon emission from a swift charged particle is prohibited. In this work, we theoretically investigate emission behaviours of a swift charged particle in the nanometallic layered structure. Our results show that Cherenkov photons are significantly enhanced by longitudinal plasmon modes resulting from the spatial nonlocality in metamaterials. More importantly, longitudinal Cherenkov photons can be directed either forward or backward, stringently depending on the particle velocity. The enhanced flexibility to route Cherenkov photons holds promise for many practical applications of Cherenkov radiation, such as novel free-electron radiation sources and new types of Cherenkov detectors.
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