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

Author

Listed:
  • Ruijuan Xu

    (North Carolina State University)

  • Iris Crassee

    (University of Geneva)

  • Hans A. Bechtel

    (Lawrence Berkeley National Laboratory)

  • Yixi Zhou

    (University of Geneva
    Capital Normal University)

  • Adrien Bercher

    (University of Geneva)

  • Lukas Korosec

    (University of Geneva)

  • Carl Willem Rischau

    (University of Geneva)

  • Jérémie Teyssier

    (University of Geneva)

  • Kevin J. Crust

    (Stanford University
    SLAC National Accelerator Laboratory)

  • Yonghun Lee

    (SLAC National Accelerator Laboratory
    Stanford University)

  • Stephanie N. Gilbert Corder

    (Lawrence Berkeley National Laboratory)

  • Jiarui Li

    (SLAC National Accelerator Laboratory
    Stanford University)

  • Jennifer A. Dionne

    (Stanford University)

  • Harold Y. Hwang

    (SLAC National Accelerator Laboratory
    Stanford University)

  • Alexey B. Kuzmenko

    (University of Geneva)

  • Yin Liu

    (North Carolina State University)

Abstract

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.

Suggested Citation

  • 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 , 2024. "Highly confined epsilon-near-zero and surface phonon polaritons in SrTiO3 membranes," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47917-x
    DOI: 10.1038/s41467-024-47917-x
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