Light trapping is a constant pursuit in photonics because of its importance in science and technology.Many mechanisms have been explored,including the use of mirrors made of materials or structures that forbid outgoing waves,and bound states in the continuum that are mirror-less but based on topology.Here we report a compound method,combining lateral mirrors and bound states in the continuum in a cooperative way,to achieve a class of on-chip optical cavities that have high quality factors and small modal volumes.Specifically,light is trapped in the transverse direction by the photonic band gap of the lateral hetero-structure and confined in the vertical direction by the constellation of multiple bound states in the continuum.As a result,unlike most bound states in the continuum found in photonic crystal slabs that are de-localized Bloch modes,we achieve light-trapping in all three dimensions and experi-mentally demonstrate quality factors as high as Q=1.09 × 106 and modal volumes as low as V =17.74(λ0/n)3 in the telecommunication regime.We further prove the robustness of our method through the statistical study of multiple fabricated devices.Our work provides a new method of light trapping,which can find potential applications in photonic integration,nonlinear optics and quantum computing.

Zihao Chen;Xuefan Yin;Jicheng Jin;Zhao Zheng;Zixuan Zhang;Feifan Wang;Li He;BO Zhen;Chao Peng

State Key Laboratory of Advanced Optical Communication Systems and Networks,Department of Electronics & Frontiers Science Center for Nano-optoelectronics,Peking University,Beijing 100871,China;Department of Physics and Astronomy,University of Pennsylvania,Philadelphia,PA 19104,USA;Peng Cheng Laboratory,Shenzhen 518055,China

科学通报（英文版）

[1]Zihao Chen;Xuefan Yin;Jicheng Jin;Zhao Zheng;Zixuan Zhang;Feifan Wang;Li He;BO Zhen;Chao Peng-.Observation of miniaturized bound states in the continuum with ultra-high quality factors)[J].科学通报（英文版）,2022(04):359-366

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