Highly confined epsilon-near-zero and surface phonon polaritons in SrTiO 3 membranes.

Autor: Xu R; Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27606, USA., Crassee I; Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland., Bechtel HA; Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., Zhou Y; Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland.; Beijing Key Laboratory of Nano-Photonics and Nano-Structure (NPNS), Department of Physics, Capital Normal University, Beijing, China., Bercher A; Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland., Korosec L; Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland., Rischau CW; Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland., Teyssier J; Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland., Crust KJ; Department of Physics, Stanford University, Stanford, CA, 94305, USA.; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA., Lee Y; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.; Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA., Gilbert Corder SN; Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., Li J; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.; Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA., Dionne JA; Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA., Hwang HY; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.; Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA., Kuzmenko AB; Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland. Alexey.Kuzmenko@unige.ch., Liu Y; Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27606, USA. yliu292@ncsu.edu.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Jun 04; Vol. 15 (1), pp. 4743. Date of Electronic Publication: 2024 Jun 04.
DOI: 10.1038/s41467-024-47917-x
Abstrakt: 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 SrTiO 3 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.
(© 2024. The Author(s).)
Databáze: MEDLINE
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