Integrated nonlinear photonics with Van der Waals materials via multi-mode quasi-BICs
Listed in
This article is not in any list yet, why not save it to one of your lists.Abstract
Layered van der Waals (VdW) materials, with their exceptional optical and electronic properties, hold great promise for advancing photonic technologies. However, their integration into high-performance optical systems has been hindered by inefficient light-matter interactions over short interaction lengths. Here, we address this challenge by integrating VdW materials with multi-mode quasi-bound states in the continuum (quasi-BICs), creating a versatile platform to enhance light-matter interactions in compact and scalable photonic devices and thereby enabling record-breaking efficiency in nonlinear and quantum photonic processes. Leveraging vectorial beam excitation, we observe a 1.6 × 10 6 - fold enhancement in second harmonic generation when pump resonates with a high-Q quasi-BIC. The multiple high-Q resonances of quasi-BICs further enable record-high efficient sum-frequency generations in the photonic crystal slabs. In addition, we experimentally demonstrate difference frequency generation, producing vectorial idler light and facilitating parametric amplification of signal emissions under continuous-wave operation. This work establishes a scalable and versatile platform for integrated photonic and quantum technologies, providing new insights into the interplay between VdW materials and BICs for advanced optical applications.