Hyperbolic phonon polaritons with positive and negative phase velocities in suspended <b> <i>α</i> </b>-MoO3
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Published version
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2.83 MB
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Checksum (MD5)
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Author(s)
Shen, Jialiang
Zheng, Zhiren
Dinh, Thao
Wang, Chuanyu
Chen, Mingyuan
Chen, Pengyu
Ma, Qiong
Jarillo-Herrero, Pablo
Kang, Lixing
Dai, Siyuan
Date Issued
March 14, 2022
Journal
Applied Physics Letters
Publisher
AIP Publishing
Citation
Jialiang Shen, Zhiren Zheng, Thao Dinh, Chuanyu Wang, Mingyuan Chen, Pengyu Chen, Qiong Ma, Pablo Jarillo-Herrero, Lixing Kang, Siyuan Dai; Hyperbolic phonon polaritons with positive and negative phase velocities in suspended α-MoO3. Appl. Phys. Lett. 14 March 2022; 120 (11): 113101.
Version
Final published version
Abstract
Sample suspension is a valuable method to improve the mechanical, thermal, electronic, and optical properties of low-dimensional materials. In terms of confined light-matter waves—the polaritons, sample suspension can elongate the wavelength of polaritons with a positive phase velocity. Previous work demonstrates a wavelength elongation of ∼10% for hyperbolic phonon polaritons (HPPs) in uniaxial crystals of hexagonal boron nitride (hBN). In this work, we report the alteration of HPPs in biaxial α-phase molybdenum trioxide (α-MoO3) by sample suspension. Our combined infrared nano-imaging experiments and electromagnetic theory reveal a wavelength elongation > 60% and a propagation length increase > 140%, due to the simultaneous wavelength elongation and dissipation elimination in the suspended specimen. We have also examined HPPs in α-MoO3 with a negative phase velocity. The sample suspension shortens the HPP wavelength and simultaneously reduces the dissipation due to the unique permittivity tensor. The HPPs with improved figures of merits in the suspended specimen may be developed for nano-polaritonic circuits, biochemical sensing, emission engineering, and energy transfer.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
10.1063/5.0085224
