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arXiv · 2207.00203

Hyperparametric oscillation via bound states in the continuum

Fuchuan Lei·Zhichao Ye·Krishna Twayana·Yan Gao·Marcello Girardi·Óskar B. Helgason·Ping Zhao·Victor Torres-Company
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Abstract

Optical hyperparametric oscillation based on the third-order nonlinearity is one of the most significant mechanisms to generate coherent electromagnetic radiation and produce quantum states of light. Advances in dispersion-engineered high-$Q$ microresonators allow for generating signal waves far from the pump and decrease the oscillation power threshold to submilliwatt levels. However, the pump-to-signal conversion efficiency and absolute signal power are low, fundamentally limited by parasitic mode competition and attainable cavity intrinsic $Q$ to coupling $Q$ ratio, i.e., $Q_{\rm i}/Q_{\rm c}$. Here, we use Friedrich-Wintgen bound states in the continuum (BICs) to overcome the physical challenges in an integrated microresonator-waveguide system. As a result, on-chip coherent hyperparametric oscillation is generated in BICs with unprecedented conversion efficiency and absolute signal power. This work not only opens a path to generate high-power and efficient continuous-wave electromagnetic radiation in Kerr nonlinear media but also enhances the understanding of microresonator-waveguide system - an elementary unit of modern photonics.

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Fuchuan Lei, Zhichao Ye, Krishna Twayana, Yan Gao, Marcello Girardi, Óskar B. Helgason, Ping Zhao, Victor Torres-Company. 2022-07-01. Hyperparametric oscillation via bound states in the continuum. https://doi.org/10.1103/physrevlett.130.093801

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