Phonon Polaritons and Epsilon Near Zero Modes in Sapphire Nanostructures Article Swipe

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Milad Nourbakhsh , Kiernan E. Arledge , Vincent R. Whiteside , Jiangang Ma ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2510.20724

Surface phonon polaritons (SPhPs) are promising candidates for enhanced light--matter interactions due to their efficient and low-loss light confinement features. In this work, we present unique light-matter interactions in saphhire within its Reststrahlen bands (RBs) across the long-wave infrared (LWIR) spectrum ($ω= 385$-$1050~\mathrm{cm}^{-1}$). Particularly, we investigated the nanocone-patterned sapphire resonator array, with specific attention to its in-plane and out-of-plane permittivity components. Through Fourier transform infrared spectroscopy measurement and full-wave photonic simulations, we identified a range of optical excitations in the RBs, including three SPhPs, two hyperbolic volume phonon polaritons (HVPhPs), and one epsilon-near-zero (ENZ) mode. The depth-resolved confocal Raman spectroscopy revealed strongly enhanced Raman signals on the nanostructured surface, suggesting the mode coupling between phonons and phonon-polaritons, which was further confirmed by the finite element modeling of polarizability. This exploratory study provides in-depth insights into the dynamics of LWIR phonon polaritons and ENZ modes in the nanostructured sapphire, indicating its great potential for innovative nanophotonic applications.

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Type: preprint
Landing Page: http://arxiv.org/abs/2510.20724
PDF: https://arxiv.org/pdf/2510.20724
OA Status: green
OpenAlex ID: https://openalex.org/W4416621893

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DOI: https://doi.org/10.48550/arxiv.2510.20724

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Title: Phonon Polaritons and Epsilon Near Zero Modes in Sapphire Nanostructures

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Type: preprint

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Publication year: 2025

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Publication date: 2025-10-23

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Authors: Milad Nourbakhsh, Kiernan E. Arledge, Vincent R. Whiteside, Jiangang Ma

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Landing page: https://arxiv.org/abs/2510.20724

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PDF URL: https://arxiv.org/pdf/2510.20724

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Cited by: 0

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