Substrate-Mediated Hyperbolic Phonon Polaritons in MoO<sub>3</sub>

Jeffrey Schwartz
(Physical Measurement Laboratory, National Institute of Standards and Technology & Institute for Research in Electronics and Applied Physics, University of Maryland, College P)

Authors:

Jeffrey Schwartz
(Physical Measurement Laboratory, National Institute of Standards and Technology & Institute for Research in Electronics and Applied Physics, University of Maryland, College P)

Son Le
(Physical Measurement Laboratory, National Institute of Standards and Technology & Theiss Research)

Sergiy Krylyuk
(Material Measurement Laboratory, National Institute of Standards and Technology)

Curt Richter
(Physical Measurement Laboratory, National Institute of Standards and Technology)

Albert V. Davydov
(Material Measurement Laboratory, National Institute of Standards and Technology)

Andrea Centrone
(Physical Measurement Laboratory, National Institute of Standards and Technology)

Hyperbolic phonon polaritons (HPhPs) are hybrid excitations of light and coherent charge oscillations that exist in strongly optically anisotropic 2D materials (e.g., MoO₃). These polaritons propagate through the material’s volume with long lifetimes, enabling novel mid-infrared nanophotonic applications by compressing light to sub-diffraction dimensions. Here, the dispersion relations and HPhP lifetimes (several ps) in single-crystal α-MoO₃ are determined by Fourier analysis of real-space, nanoscale-resolution polariton images obtained with the photothermal induced resonance (PTIR) technique. Measurements of MoO₃ crystals deposited on periodic gratings showed longer HPhPs propagation lengths (≈ 2 ×) and lower optical compressions in suspended regions compared to regions in direct contact with the substrate. Additionally, PTIR data reveal polymeric contaminants, resulting from sample preparation, localized under parts of the MoO₃ crystals. This work enhances the ability to engineer nanophotonic devices by leveraging substrate morphology to control polariton propagation.

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Bulletin of the American Physical Society

APS March Meeting 2021

Volume 66, Number 1

Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA

Session M60: Experimental Optical Spectroscopic Measurements of 2D Materials II

Abstract: M60.00011 : Substrate-Mediated Hyperbolic Phonon Polaritons in MoO3

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Abstract: M60.00011 : Substrate-Mediated Hyperbolic Phonon Polaritons in MoO₃