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Title: Nano-optical engineering of anisotropic phonon resonances in a hyperbolic α-MoO₃ metamaterial
Authors: Ye, Ming
Qiang, Bo
Zhu, Song
Dai, Mingjin
Wang, Fakun
Luo, Yu
Wang, Qian
Wang, Qi Jie
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2022
Source: Ye, M., Qiang, B., Zhu, S., Dai, M., Wang, F., Luo, Y., Wang, Q. & Wang, Q. J. (2022). Nano-optical engineering of anisotropic phonon resonances in a hyperbolic α-MoO₃ metamaterial. Advanced Optical Materials, 10(19), 2102096-.
Project: MOE2018-T2-1-176 
Journal: Advanced Optical Materials 
Abstract: Low-dimensional α-phase molybdenum trioxide (α-MoO3), a layered van-der-Waals (vdW) semiconductor, has emerged as an attractive natural hyperbolic material supporting mid-infrared hyperbolic phonon polaritons (PhPs), which exhibit strong spatial confinement and low loss. With the advantages of strong in-plane optical anisotropy, many efforts have been devoted to investigating the properties of hyperbolic PhPs in α-MoO3 using scanning near-field optical microscopy. However, the studies of far-field controlling of hyperbolic PhPs in α-MoO3 have been quite limited so far. This work reports the first experimental demonstration of far-field excitation and manipulation of hyperbolic phonon resonances in metamaterial structures consisting of α-MoO3 nanodisks and slabs. The excited phonon resonances show a maximum spatial confinement factor (free space wavelength/period) of 32 and a quality factor of 76. It is shown that the in-plane phonon resonances in α-MoO3 can be selectively excited in the two Reststrahlen bands featuring hyperbolic dispersion relations along its two crystal directions, by simply controlling the incident polarization. In addition, the relative strength of resonances along different in-plane crystal directions and the resultant field distributions can be continuously reconfigured by varying the incident polarization angle. These findings pave the way for future development of novel nanophotonic devices based on hyperbolic PhPs in vdW materials.
ISSN: 2195-1071
DOI: 10.1002/adom.202102096
Rights: © 2022 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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