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The ability of a naturally hyperbolic van der Waals material α-MoO3 to sustain hyperbolic phonon-polaritons allows extreme localization of the mid-infrared electromagnetic field on a subwavelength scale. We propose periodic nanohole arrays in exfoliated α-MoO3 nanoflakes to tune the wavelength of phonon-polariton resonances. We report on the optical properties of α-MoO3 nanohole arrays and their dependence on their geometry. Results have been confirmed using the finite-difference time-domain simulations and near-field mapping of phonon-polaritonic modes. We observe an unusual behavior of the transmission spectra in the fundamental absorption band, where the phononic absorption can be almost entirely alleviated.
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Mariia S. Stepanova, Zhaoxu Li, Mashnoon A. Sakib, Naveed Hussain, Hemantha K. Wickramasinghe, Maxim R. Shcherbakov, "Manipulating phonon-polariton resonances in patterned α-MoO3," Proc. SPIE PC12646, Metamaterials, Metadevices, and Metasystems 2023, PC126461T (6 October 2023); https://doi.org/10.1117/12.2677704