Physics

Highly confined epsilon-near-zero and surface phonon polaritons in SrTiO3 membranes

R. Xu, I. Crassee, et al.

This groundbreaking research conducted by Ruijuan Xu and colleagues confirms that transition metal perovskite oxide membranes can support surface phonon polaritons in the infrared range with remarkable efficiency and confinement. Experimental techniques like FTIR spectroscopy reveal exciting phenomena including mode splitting and highly confined propagative SPhPs, positioning oxide membranes at the forefront of infrared photonics and polaritonics.

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Abstract

Recent theoretical studies proposed that transition metal perovskite oxide membranes could enable surface phonon polaritons (SPhPs) in the infrared range with low loss and stronger subwavelength confinement than bulk crystals. This study experimentally confirms these predictions using FTIR spectroscopy and synchrotron infrared nanospectroscopy (SINS) on a 100 nm thick SrTiO3 membrane. Symmetric-antisymmetric mode splitting, epsilon-near-zero (ENZ) modes, Berreman modes, and highly confined propagating phonon polaritons were observed. Theoretical modeling supports the experimental findings, highlighting the potential of oxide membranes for infrared photonics and polaritonics.

Publisher

Nature Communications

Published On

Jun 04, 2024

Authors

Ruijuan Xu, Iris Crassee, Hans A. Bechtel, Yixi Zhou, Adrien Bercher, Lukas Korosec, Carl Willem Rischau, Jérémie Teyssier, Kevin J. Crust, Yonghun Lee, Stephanie N. Gilbert Corder, Jiarui Li, Jennifer A. Dionne, Harold Y. Hwang, Alexey B. Kuzmenko, Yin Liu

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