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

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

doi:10.1038/s41467-024-47917-x

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

Journal Article · Tue Jun 04 00:00:00 EDT 2024 · Nature Communications

DOI:https://doi.org/10.1038/s41467-024-47917-x· OSTI ID:2403486

^[1]; Crassee, Iris ^[2]; ^[3]; Zhou, Yixi ^[4]; Bercher, Adrien ^[2]; ^[2]; Rischau, Carl Willem ^[2]; ^[2]; Crust, Kevin J. ^[5]; Lee, Yonghun ^[6]; ^[3]; ^[6]; ^[7]; ^[6]; ^[2]; ^[1]

North Carolina State University, Raleigh, NC (United States)
Univ. of Geneva (Switzerland)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Univ. of Geneva (Switzerland); Capital Normal University, Beijing (China). Beijing Key Laboratory of Nano-Photonics and Nano-Structure (NPNS)
Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States)
Stanford Univ., CA (United States)

Recent theoretical studies have suggested that transition metal perovskite oxide membranes can enable surface phonon polaritons in the infrared range with low loss and much stronger subwavelength confinement than bulk crystals. Such modes, however, have not been experimentally observed so far. Here, using a combination of far-field Fourier-transform infrared (FTIR) spectroscopy and near-field synchrotron infrared nanospectroscopy (SINS) imaging, we study the phonon polaritons in a 100 nm thick freestanding crystalline membrane of SrTiO₃ transferred on metallic and dielectric substrates. We observe a symmetric-antisymmetric mode splitting giving rise to epsilon-near-zero and Berreman modes as well as highly confined (by a factor of 10) propagating phonon polaritons, both of which result from the deep-subwavelength thickness of the membranes. Theoretical modeling based on the analytical finite-dipole model and numerical finite-difference methods fully corroborate the experimental results. Our work reveals the potential of oxide membranes as a promising platform for infrared photonics and polaritonics.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515

OSTI ID:: 2403486

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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