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
Tags
phonon polaritons
perovskite oxide membranes
infrared photonics
mode splitting
SPhPs
synchrotron infrared nanospectroscopy
ENZ modes
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