Affiliation:
1. Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China
2. ZJU‐Hangzhou Global Science and Technology Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang Zhejiang University Hangzhou 310027 China
3. International Joint Innovation Center ZJU‐UIUC Institute Zhejiang University Haining 314400 China
Abstract
AbstractEffectual free‐space optical metasurface is essential for telecommunication and information processing. However, the lack of efficient optical nonlinearity is still an obstacle to empower its full capability and practical applications. Metallic quantum wells (MQWs) with large nonlinear susceptibility may pave a new way. Here, such MQWs are implemented into a resonance configuration of the quasi bound state in the continuum (BIC) and an efficient tunable plasmonic metasurface is proposed. Such metasurface is composed of MQWs‐based nanostructure, which supports the tunable plasmonic quasi‐BIC. The tunability is controlled through substantial change in refractive index of MQWs induced by Kerr‐type nonlinearity, which leads to around 9 dB extinction ratio and extremely high modulation speed up to terahertz level. The quasi‐BIC with narrow linewidth is obtained through symmetry‐breaking of nanoelliptical elements, further enhancing the modulation depth. This work satisfies the ultrafast‐speed and high‐efficiency requirement of free‐space all‐optical metasurfaces, including the spatial light modulators in optical computing field.
Funder
Zhejiang University
National Key Research and Development Program of China
National Natural Science Foundation of China
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献