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@article{Oue:2022:10.1103/PhysRevResearch.4.013064,
author = {Oue, D and Ding, K and Pendry, J},
doi = {10.1103/PhysRevResearch.4.013064},
journal = {Physical Review Research},
pages = {1--6},
title = {Cerenkov radiation in vacuum from a superluminal grating},
url = {http://dx.doi.org/10.1103/PhysRevResearch.4.013064},
volume = {4},
year = {2022}
}

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TY  - JOUR
AB  - Nothing can physically travel faster than light in vacuum. There are several ways proposed to bypass the light barrier and produce Cerenkov radiation ( CR) in vacuum. In this article, we theoretically predict CR in vacuum from a spatiotemporally modulated boundary. We consider the modulation of traveling wave type and apply a uniform electrostatic field on the boundary to generate electric dipoles. Since the induced dipoles stick to the interface, they travel at the modulation speed. When the grating travels faster than light, it emits CR. In order to quantitatively examine this argument, we need to calculate the field scattered at the boundary. We utilise a dynamicaldifferential method, which we developed in the previous paper, to quantitatively evaluate the field distribution in such a situation. We can confirm that all scattered fields are evanescent if the modulation speed is slower than light while some become propagating if the modulation is fasterthan light.
AU  - Oue,D
AU  - Ding,K
AU  - Pendry,J
DO  - 10.1103/PhysRevResearch.4.013064
EP  - 6
PY  - 2022///
SN  - 2643-1564
SP  - 1
TI  - Cerenkov radiation in vacuum from a superluminal grating
T2  - Physical Review Research
UR  - http://dx.doi.org/10.1103/PhysRevResearch.4.013064
UR  - https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.4.013064
UR  - http://hdl.handle.net/10044/1/93898
VL  - 4
ER  -

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