Phonon Polaritons and Epsilon Near Zero Modes in Sapphire Nanostructures
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2025
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| author | Nourbakhsh, Milad Arledge, Kiernan E. Whiteside, Vincent R. Ma, Jiangang Tischler, Joseph G. Weng, Binbin |
| author_facet | Nourbakhsh, Milad Arledge, Kiernan E. Whiteside, Vincent R. Ma, Jiangang Tischler, Joseph G. Weng, Binbin |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_20724 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phonon Polaritons and Epsilon Near Zero Modes in Sapphire Nanostructures Nourbakhsh, Milad Arledge, Kiernan E. Whiteside, Vincent R. Ma, Jiangang Tischler, Joseph G. Weng, Binbin Optics 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. |
| title | Phonon Polaritons and Epsilon Near Zero Modes in Sapphire Nanostructures |
| topic | Optics |
| url | https://arxiv.org/abs/2510.20724 |