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Title: Superlight inverse Doppler effect
Authors: Shi, Xihang
Lin, Xiao
Kaminer, Ido
Gao, Fei
Yang, Zhaoju
Joannopoulos, John D.
Soljačić, Marin
Zhang, Baile
Keywords: Doppler Effect
Issue Date: 2018
Source: Shi, X., Lin, X., Kaminer, I., Gao, F., Yang, Z., Joannopoulos, J. D., . . . Zhang, B. (2018). Superlight inverse Doppler effect. Nature Physics, 14(10), 1001-1005. doi:10.1038/s41567-018-0209-
Journal: Nature Physics
Series/Report no.: Nature Physics
Abstract: It has long been thought that the inverse Doppler frequency shift of light is impossible in homogeneous systems with a positive refractive index. Here we break this long-held tenet by predicting a previously unconsidered Doppler effect of light inside a radiation cone, the so-called Vavilov–Cherenkov cone, under specific circumstances. It has been known from the classic work of Ginzburg and Frank that a superlight (that is, superluminal) normal Doppler effect appears inside the Vavilov–Cherenkov cone if the velocity of the source v is larger than the phase velocity of light vp. By further developing their theory, we discover that an inverse Doppler frequency shift will arise if v> 2vp. We denote this as the superlight inverse Doppler effect. Moreover, we show that the superlight inverse Doppler effect can be spatially separated from the other Doppler effects by using highly squeezed polaritons (such as graphene plasmons), which may facilitate the experimental observation.
ISSN: 1745-2473
DOI: 10.1038/s41567-018-0209-6
Rights: © 2018 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. This paper was published in Nature Physics and is made available with permission of Macmillan Publishers Limited, part of Springer Nature.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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