Journal
LASER & PHOTONICS REVIEWS
Volume 14, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202000149
Keywords
Cherenkov radiation; hyperbolic metamaterials; spatial nonlocality
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Funding
- Singapore Ministry of Education [MOE2018-T2-1-022 (S), MOE2016-T3-1-006 (RG174/16 (S)), MOE2016-T3-1-006, Tier 1 RG174/16 (S), MOE2018-T2-2-189 (S)]
- A*Star AME Programmatic Funds [A18A7b0058]
- National Research Foundation Singapore Competitive Research Program [NRF-CRP18-2017-02]
- National Science Foundation of China [61871127]
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Cherenkov radiation is generally believed to be threshold-free in hyperbolic metamaterials owing to the extremely large photonic density of states in classical local framework. Although recent advances in nonlocal and quantum plasmonics extend our understanding of light-matter interactions in metamaterials, how such effects influence Cherenkov radiation in hyperbolic metamaterials still remains unknown. Here, it is demonstrated that effects of nonlocality add a new degree of freedom to engineer Cherenkov thresholds in hyperbolic metamaterials. The interplay between finite structural dimensions and nonlocal nature of metallic electrons results in a nonzero Cherenkov threshold. Counterintuitively, such nonlocality-induced Cherenkov threshold can be significantly smaller than the classically predicted one if the metamaterial is designed to work around the epsilon-near-zero frequency. This phenomenon is attributed to the excitation of longitudinal plasmon modes which are absent in classical electromagnetic framework. These findings apply to a general class of hyperbolic materials, including metallodielectric layered structures, nanorod/nanoribbon arrays, hyperbolic van der Waals crystals, etc.
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