首页|Enhanced wide-angle third-harmonic generation in flat-band-engineered quasi-BIC metagratings
Enhanced wide-angle third-harmonic generation in flat-band-engineered quasi-BIC metagratings
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Nonlinear metasurfaces and photonic crystals provide a significant way to generate and manipulate nonlinear signals owing to the resonance-and symmetry-based light-matter interactions supported by the artificial structures.However,the nonlinear conversion efficiency is generally limited by the angular dispersion of optical resonances especially in nonparaxial photonics.Here,we propose a metagrating realizing a quasi-bound-state in the continuum in a flat band to dramatically improve the third harmonic generation(THG)efficiency.A superior operating angular range is achieved based on the interlayer and intralayer couplings,which are introduced by breaking the mirror symmetry of the metagrating.We demonstrate the relation of angular dispersion between the nonlinear and linear responses at different incident angles.We also elucidate the mechanism of these off-axis flat-band-based nonlinear conversions through different mode decomposition.Our scheme provides a robust and analytical way for nonparaxial nonlinear generation and paves the way for further applications such as wide-angle nonlinear information transmission and enhanced nonlinear generation under tight focusing.
nonlinear metasurfacesquasi-bound-state in the continuumangular dispersionthird harmonic generation efficiency
The Key Laboratory of Weak Light Nonlinear Photonics,Ministry of Education,School of Physics and TEDA Institute of Applied Physics,Nankai University,Tianjin 300071,China
School of Materials Science and Engineering,Smart Sensing Interdisciplinary Science Center,Nankai University,Tianjin 300350,China
The Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China
国家重点研发计划国家重点研发计划National Natural Science Fund for Dislinguished Young Scholar国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金
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