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Tunable Cherenkov Radiation of Phonon Polaritons in Silver Nanowire/Hexagonal Boron Nitride Heterostructures
journal contribution
posted on 2020-03-11, 18:43 authored by Yiran Zhang, Cheng Hu, Bosai Lyu, Hongyuan Li, Zhe Ying, Lele Wang, Aolin Deng, Xingdong Luo, Qiang Gao, Jiajun Chen, Jing Du, Peiyue Shen, Kenji Watanabe, Takashi Taniguchi, Ji-Hun Kang, Feng Wang, Yueheng Zhang, Zhiwen ShiPolaritons in two-dimensional
(2D) materials have shown their unique
capabilities to concentrate light into deep subwavelength scales.
Precise control of the excitation and propagation of 2D polaritons
has remained a central challenge for future on-chip nanophotonic devices
and circuits. To solve this issue, we exploit Cherenkov radiation,
a classic physical phenomenon that occurs when a charged particle
moves at a velocity greater than the phase velocity of light in that
medium, in low-dimensional material heterostructures. Here, we report
an experimental observation of Cherenkov phonon polariton wakes emitted
by superluminal one-dimensional plasmon polaritons in a silver nanowire
and hexagonal boron nitride heterostructure using near-field infrared
nanoscopy. The observed Cherenkov radiation direction and radiation
rate exhibit large tunability through varying the excitation frequency.
Such tunable Cherenkov phonon polaritons provide opportunities for
novel deep subwavelength-scale manipulation of light and nanoscale
control of energy flow in low-dimensional material heterostructures.
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radiation rate exhibitSuch tunable Cherenkov phonon polaritonslow-dimensional material heterostructuresTunable Cherenkov Radiationfuture on-chip nanophotonic devicesparticle movesboron nitride heterostructurePhonon Polaritonsenergy flowsubwavelength scalesPrecise controlphase velocitysilver nanowireexcitation frequency2 D polaritonsCherenkov radiation directionplasmon polaritonsCherenkov phonon polaritonnanoscale controlsubwavelength-scale manipulationCherenkov radiation
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