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Three-dimensional Near-field Anatomy Reveals Geometric Resonance of Hyperbolic Phonon Polariton Micro-Structures | | Haomin Wang
; Jiahan Li
; James H. Edgar
; Xiaoji G. Xu
; | | Date: |
14 Aug 2019 | | Abstract: | Standing waves of defined momentum arise when the propagating wave is
confined by finite boundaries of suitable dimensions and symmetry. Phonon
polaritons, often supported by two-dimensional materials, are waves formed from
hybridization of collective phonon oscillations and electromagnetic field.
Polaritons propagate with short wavelengths and high field confinement and are
the basis for nano-photonic devices. Here, we perform near-field anatomy of
isotopically pure hexagonal boron nitride (h-11BN) micro-disk and a reflective
edge from three-dimensional near-field response cubes obtained by the peak
force scattering-type near-field optical microscopy (PF-SNOM). Momentum
quantization of polaritonic standing wave is revealed in situ from the
confinement of the circular microstructures. The distance between near-field
tip and sample can fine-tune the momentum of polaritons, and modifying the
superposition of polaritonic standing wave modes. The three-dimensional
near-field anatomy can be expanded to other polariton-supporting materials,
evaluating geometrical resonances in situ toward the betterment of
nano-photonic devices. | | Source: | arXiv, 1908.5230 | | Services: | Forum | Review | PDF | Favorites | |
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