Quantization of Mode Shifts in Nanocavities Integrated with Atomically Thin Sheets

Nan Fang, Daiki Yamashita, Shun Fujii, Keigo Otsuka, Takashi Taniguchi, Kenji Watanabe, Kosuke Nagashio, Yuichiro K. Kato

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The unique optical properties of 2D layered materials are attractive for achieving increased functionality in integrated photonics. Owing to the van der Waals nature, these materials are ideal for integrating with nanoscale photonic structures. Here a carefully designed air-mode silicon photonic crystal nanobeam cavity for efficient control through 2D materials is reported. By systematically investigating various types and thicknesses of 2D materials, the authors are able to show that enhanced responsivity allows for giant shifts of the resonant wavelength. With atomically precise thickness over a macroscopic area, few-layer flakes give rise to quantization of the mode shifts. The dielectric constant of the flakes is extracted and found to be independent of the layer number down to a monolayer. Flexible reconfiguration of a cavity is demonstrated by stacking and removing ultrathin flakes. With an unconventional cavity design, these results open up new possibilities for photonic devices integrated with 2D materials.

Original languageEnglish
Article number2200538
JournalAdvanced Optical Materials
Issue number19
Publication statusPublished - 2022 Oct 4
Externally publishedYes


  • 2D materials
  • cavity mode modification
  • nanocavities
  • quantization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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