1D quasi-bound states in the continuum with large operation bandwidth in theω~k space for nonlinear optical applications  

作　　者：KAILI SUN HUI JIANG DMITRY ABYKOV VIEN VAN URIEL LEVY YANGJIAN CAI ZHANGHUA HAN 

机构地区：[1]Shandong Provincial Key Laboratory of Optics and Photonic Devices,Center of Light Manipulation and Applications,School of Physics and Electronics,Shandong Normal University,Jinan 250358,China [2]Image Processing Systems Institute—Branch of the Federal Scientific Research Centre“Crystallography and Photonics”of Russian Academy of Sciences,Samara 443001,Russia [3]Department of Electrical and Computer Engineering,University of Alberta,Edmonton,Alberta T6G 2V4,Canada [4]Department of Applied Physics,and Center for Nanoscience and Nanotechnology,The Hebrew University of Jerusalem,Jerusalem,Israel

出　　处：《Photonics Research》2022年第7期1575-1581,共7页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(11974221)。

摘　　要：The phenomenon of bound state in the continuum(BIC)with an infinite quality factor and lifetime has emerged in recent years in photonics as a new tool to manipulate light-matter interactions.However,most of the investigated structures only support BIC resonances at very few discrete points in theω~k space.Even when the BIC is switched to a quasi-BIC(QBIC)resonance through perturbation,its frequency will still be located within a narrow spectral band close to that of the original BIC,restricting their applications in many fields where random or multiple input frequencies beyond the narrow band are required.In this work,we demonstrate that a new set of QBIC resonances can be supported by using a special binary grating consisting of two alternatingly aligned ridge arrays with the same period and zero-approaching ridge width difference on a slab waveguide.These QBIC resonances are distributed continuously over a broad band along a line in theω~k space and can thus be considered as 1 D QBICs.With the Q factors generally affected by the ridge difference,it is now possible to arbitrarily choose any frequencies on the dispersion line to achieve significantly enhanced light-matter interactions,facilitating many applications where multiple input wavelengths are required;e.g.,sum or difference frequency generations in nonlinear optics.

关 键 词：QUASI NONLINEAR NARROW 

分 类 号：O437[机械工程—光学工程]