Substrate-mediated hyperbolic phonon polaritons in MoO3

Hyperbolic phonon polaritons (HPhPs) are hybrid excitations of light and coherent lattice vibrations that exist in strongly optically anisotropic media, including two-dimensional materials (e.g., MoO ). These polaritons propagate through the material’s volume with long lifetimes, enabling novel mid-...

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Bibliographic Details
Published in:	Nanophotonics (Berlin, Germany) Vol. 10; no. 5; pp. 1517 - 1527
Main Authors:	Schwartz, Jeffrey J., Le, Son T., Krylyuk, Sergiy, Richter, Curt A., Davydov, Albert V., Centrone, Andrea
Format:	Journal Article
Language:	English
Published:	Berlin De Gruyter 15-02-2021 Walter de Gruyter GmbH
Subjects:	2D materials Anisotropic media Anisotropy Contaminants Crystal defects Fourier analysis hyperbolic materials Laboratories Lattice vibration Light Molybdenum oxides Molybdenum trioxide phonon polaritons Phonons photothermal induced resonance Polaritons Propagation Propagation (polymerization) Single crystals Substrates subwavelength optical confinement Two dimensional materials
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Summary:	Hyperbolic phonon polaritons (HPhPs) are hybrid excitations of light and coherent lattice vibrations that exist in strongly optically anisotropic media, including two-dimensional materials (e.g., MoO ). These polaritons propagate through the material’s volume with long lifetimes, enabling novel mid-infrared nanophotonic applications by compressing light to sub-diffractional dimensions. Here, the dispersion relations and HPhP lifetimes (up to ≈12 ps) in single-crystalline α-MoO are determined by Fourier analysis of real-space, nanoscale-resolution polariton images obtained with the photothermal induced resonance (PTIR) technique. Measurements of MoO crystals deposited on periodic gratings show longer HPhPs propagation lengths and lifetimes (≈2×), and lower optical compressions, in suspended regions compared with regions in direct contact with the substrate. Additionally, PTIR data reveal MoO subsurface defects, which have a negligible effect on HPhP propagation, as well as polymeric contaminants localized under parts of the MoO crystals, which are derived from sample preparation. This work highlights the ability to engineer substrate-defined nanophotonic structures from layered anisotropic materials.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
ISSN:	2192-8606 2192-8614
DOI:	10.1515/nanoph-2020-0640