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arXiv · 2204.03923

Electron microscopy probing electron-photon interactions in SiC nanowires with ultra-wide energy and momentum match

Jinlong Du·Jin-hui Chen·Yuehui Li·Ruochen Shi·Mei Wu·Yun-Feng Xiao·Peng Gao
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Abstract

Nanoscale materials usually can trap light and strongly interact with it leading to many photonic device applications. The light-matter interactions are commonly probed by optical spectroscopy, which, however, have some limitations such as diffraction-limited spatial resolution, tiny momentum transfer and non-continuous excitation/detection. In this work, using scanning transmission electron microscopy-electron energy loss spectroscopy (STEM-EELS) with ultra-wide energy and momentum match and sub-nanometer spatial resolution, we study the optical microcavity resonant spectroscopy in a single SiC nanowire. The longitudinal Fabry-Perot (FP) resonating modes and the transverse whispering-gallery modes (WGMs) are simultaneously excited and detected, which span from near-infrared (~ 1.2 {\mu}m) to ultraviolet (~ 0.2 {\mu}m) spectral regime and the momentum transfer can be ranging up to 108 cm{^{-1}}. The size effects on the resonant spectra of nanowires are also revealed. Moreover, the nanoscale decay length of resonant EELS is revealed, which is contributed by the strongly localized electron-photon interactions in the SiC nanowire. This work provides a new alternative technique to investigate the optical resonating spectroscopy of a single nanowire structure and to explore the light-matter interactions in dielectric nanostructures, which is also promising for modulating free electrons via photonic structures.

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Jinlong Du, Jin-hui Chen, Yuehui Li, Ruochen Shi, Mei Wu, Yun-Feng Xiao, Peng Gao. 2022-04-08. Electron microscopy probing electron-photon interactions in SiC nanowires with ultra-wide energy and momentum match. https://doi.org/10.1021/acs.nanolett.2c01672

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