Meta-optics and bound states in the continuum

作     者：Kirill Koshelev Andrey Bogdanov Yuri Kivshar 

作者机构：Nonlinear Physics CentreAustralian National UniversityCanberra ACT 2601Australia ITMO UniversitySt. Petersburg 197101Russia 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2019年第64卷第12期

页      面：836-842页

核心收录：

学科分类：07[理学] 08[工学] 

基　　金：financial support from the Australian Research Council the Strategic Fund of the Australian National University the Alexander von Humboldt Foundation financial support by the Russian Science Foundation(grant 18-72-10140) financial support by the Ministry of Education and Science of the Russian Federation(3.1500.2017/4.6) support from the Foundation for the Advancement of Theoretical Physics and Mathematics ‘‘BASIS”(Russia) 

主　　题：Bound states in the continuum Meta-optics Second-harmonic generation Nanoresonator Metasurfaces 

摘      要：We discuss the recent advances in meta-optics and nanophotonics associated with the physics of bound states in the continuum(BICs). Such resonant states appear due to a strong coupling between leaky modes in optical guiding structures being supported by subwavelength high-index dielectric Mieresonant nanoantennas or all-dielectric metasurfaces. First, we review briefly very recent developments in the BIC physics in application to isolated subwavelength particles. We pay a special attention to novel opportunities for nonlinear nanophotonics due to the large field enhancement inside the particle volume creating the resonant states with high-quality(high-Q) factors, the so-called quasi-BIC, that can be supported by the subwavelength particles. Second, we discuss novel applications of the BIC physics to alldielectric optical metasurfaces with broken-symmetry meta-atoms when tuning to the BIC conditions allows to enhance substantially the Q factor of the flat-optics dielectric structures. We also present the original results on nonlinear high-Q metasurfaces and predict that the frequency conversion efficiency can be boosted dramatically by smart engineering of the asymmetry parameter of dielectric metasurfaces in the vicinity of the quasi-BIC regime.