Manipulating phonon-polariton resonances in patterned α-MoO3

Mariia S. Stepanova; Zhaoxu Li; Mashnoon A. Sakib; Naveed Hussain; Hemantha K. Wickramasinghe; Maxim R. Shcherbakov

doi:10.1117/12.2677704

6 October 2023 Manipulating phonon-polariton resonances in patterned α-MoO₃

Mariia S. Stepanova, Zhaoxu Li, Mashnoon A. Sakib, Naveed Hussain, Hemantha K. Wickramasinghe, Maxim R. Shcherbakov

Proceedings Volume PC12646, Metamaterials, Metadevices, and Metasystems 2023; PC126461T (2023) https://doi.org/10.1117/12.2677704
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

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Abstract

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, and 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

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