TY - JOUR
T1 - Superlight inverse Doppler effect
AU - Shi, Xihang
AU - Lin, Xiao
AU - Kaminer, Ido
AU - Gao, Fei
AU - Yang, Zhaoju
AU - Joannopoulos, John D.
AU - Soljačić, Marin
AU - Zhang, Baile
N1 - Publisher Copyright:
© 2018, The Author(s).
PY - 2018/10/1
Y1 - 2018/10/1
N2 - It has long been thought 1 that the inverse Doppler frequency shift of light 2–13 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 14–18 appears inside the Vavilov–Cherenkov cone if the velocity of the source v is larger than the phase velocity of light v p . By further developing their theory, we discover that an inverse Doppler frequency shift will arise if v > 2v p . 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.
AB - It has long been thought 1 that the inverse Doppler frequency shift of light 2–13 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 14–18 appears inside the Vavilov–Cherenkov cone if the velocity of the source v is larger than the phase velocity of light v p . By further developing their theory, we discover that an inverse Doppler frequency shift will arise if v > 2v p . 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.
UR - http://www.scopus.com/inward/record.url?scp=85049608273&partnerID=8YFLogxK
U2 - 10.1038/s41567-018-0209-6
DO - 10.1038/s41567-018-0209-6
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.letter???
AN - SCOPUS:85049608273
SN - 1745-2473
VL - 14
SP - 1001
EP - 1005
JO - Nature Physics
JF - Nature Physics
IS - 10
ER -