Article van der Waals Decoration of Ultra-High-Q Silica Microcavities for χ(2)–χ(3) Hybrid Nonlinear Photonics

Shun Fujii ; Nan Fang ; Daiki Yamashita ; Daichi Kozawa SAMURAI ORCID (National Institute for Materials Science) ; Chee Fai Fong ; Yuichiro K. Kato

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Shun Fujii, Nan Fang, Daiki Yamashita, Daichi Kozawa, Chee Fai Fong, Yuichiro K. Kato. van der Waals Decoration of Ultra-High-Q Silica Microcavities for χ(2)–χ(3) Hybrid Nonlinear Photonics. Nano Letters. 2024, 24 (14), 4209-4216. https://doi.org/10.1021/acs.nanolett.4c00273
SAMURAI

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(abstract)

Optical nonlinear processes are indispensable in a wide range of applications, including ultrafast lasers, microscopy, and quantum information technologies. Among the diverse nonlinear processes, second-order effects usually overwhelm the higher-order ones, except in centrosymmetric systems, where the second-order susceptibility vanishes to allow the use of the third-order nonlinearity. Here we demonstrate a hybrid photonic platform whereby the balance between second- and third-order susceptibilities can be tuned flexibly. By decorating ultra-high-Q silica microcavities with atomically thin tungsten diselenide, we observe cavity-enhanced second-harmonic generation and sum-frequency generation with continuous-wave excitation at a power level of only a few hundred microwatts. We show that the coexistence of second- and third-order nonlinearities in a single device can be achieved by carefully choosing the size and location of the two-dimensional material. Our approach can be generalized to other types of cavities, unlocking the potential of hybrid systems with controlled nonlinear susceptibilities for novel applications.

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Keyword: two-dimensional materials, ultra-high-Q microcavities, second-harmonic generation, nonlinear optics, transition metal dichalcogenides

Date published: 2024-04-10

Publisher: American Chemical Society (ACS)

Journal:

  • Nano Letters (ISSN: 15306984) vol. 24 issue. 14 p. 4209-4216

Funding:

  • RIKEN
  • Japan Society for the Promotion of Science JP22H01893
  • Japan Society for the Promotion of Science JP22K14623
  • Japan Society for the Promotion of Science JP22K14624
  • Japan Society for the Promotion of Science JP22K14625
  • Japan Society for the Promotion of Science JP23H00262

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1021/acs.nanolett.4c00273

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Updated at: 2024-08-22 08:30:13 +0900

Published on MDR: 2024-08-22 08:30:14 +0900

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