Paratellurite Nanowires as a Versatile Material for THz Phonon Polaritons

Rafael Mayer

doi:10.1021/acsphotonics.4c01249

Paratellurite Nanowires as a Versatile Material for THz Phonon Polaritons

2024-09-20

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Stephanie N. Gilbert Corder

Emilson Ribeiro Viana

DOI：10.1021/acsphotonics.4c01249

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Polaritons, i.e., hybrid quasi-particles of light and matter resonances, have been extensively investigated due to their potential to enhance light-matter interactions. Although polaritonic applications thrive in the mid-infrared range, their extension to the terahertz (THz) range remains limited. Here, we present paratellurite (alpha-TeO2) nanowires, a versatile material acting as a platform for different types of phonon polaritons. Utilizing synchrotron infrared nanospectroscopy from 10 to 24 THz, we uncover the polaritonic properties of alpha-TeO2 nanowires, showcasing their dual functionality as both a Fabry-P & eacute;rot cavity and a waveguide for surface phonon polaritons. Furthermore, near-field measurements with a free-electron laser as a THz source reveal a localized optical contrast down to 5.5 THz, an indication of hyperbolic bands. Our findings complement the repertoire of polaritonic materials, with significant implications for advancing THz technologies.

Keywords:

synchrotron

IR nanospectroscopy

one-dimensionalmaterials

terahertz

s-SNOM

Paratellurite Nanowires as a Versatile Material for THz Phonon Polaritons

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