Van der Waals Decoration of Ultra-High-Q Silica Microcavities for χ⁽²⁾-χ⁽³⁾ Hybrid Nonlinear Photonics.

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

SUBMITTER: Fujii S 

PROVIDER: S-EPMC11010230 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature