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<p>Phonon polaritons in anisotropic materials hold exceptional potential for manipulating light at the deep-subwavelength scale. In this study, we investigate the in-plane anisotropic phonon-polaritonic resonances in orthorhombic molybdenum trioxide (α-MoO<sub>3</sub>) nanostructures using scattering-type scanning near-field optical microscopy. By fabricating square-shaped resonators with varying crystallographic orientations, we experimentally demonstrate the tunability of phonon-polaritonic resonances in α-MoO<sub>3</sub>. Our findings reveal that the resonance frequency and interference patterns are strongly influenced by the structural alignment of the resonator. This study provides a pathway for nanoscale light confinement and control, offering valuable insights for advancing nanophotonic device engineering.</p> Graphical abstract <p></p>

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Nanospectroscopy of in-plane anisotropic phonon-polaritonic resonance in α-MoO3 nanostructures

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Siyu Wang,
  • Yuequan Wu,
  • Yanyu Zhao,
  • Delong Li,
  • Yupeng Zhang,
  • Youning Gong

摘要

Phonon polaritons in anisotropic materials hold exceptional potential for manipulating light at the deep-subwavelength scale. In this study, we investigate the in-plane anisotropic phonon-polaritonic resonances in orthorhombic molybdenum trioxide (α-MoO3) nanostructures using scattering-type scanning near-field optical microscopy. By fabricating square-shaped resonators with varying crystallographic orientations, we experimentally demonstrate the tunability of phonon-polaritonic resonances in α-MoO3. Our findings reveal that the resonance frequency and interference patterns are strongly influenced by the structural alignment of the resonator. This study provides a pathway for nanoscale light confinement and control, offering valuable insights for advancing nanophotonic device engineering.

Graphical abstract