Journal
NANO LETTERS
Volume 20, Issue 4, Pages 2770-2777Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00419
Keywords
Cherenkov radiation; 2D materials; infrared nanoscopy; phonon polaritons
Categories
Funding
- National Key Research and Development Program of China [2016YFA0302001]
- National Natural Science Foundation of China [11774224, 11574204]
- National Thousand Youth Talents Plan
- Shanghai Thousand Talents Plan
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Elemental Strategy Initiative
- MEXT, Japan
- JSPS
- CREST, JST [JPMJCR15F3]
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Polaritons 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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