arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1903.02454physics.opticsphysics.app-ph
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全介质超颖表面中石墨烯与局域热点的强相互作用

Strong interaction between graphene and localized hot spots in all-dielectric metasurfaces

Shuyuan Xiao, Tingting Liu, Chaobiao Zhou, Xiaoyun Jiang, Le Cheng, Yuebo Liu, Zhong Li

摘要:

基于二维材料石墨烯的有源光子学在开发可调谐、紧凑、高效的光学器件方面引起了人们极大的兴趣。在此,我们将石墨烯集成到由硅分裂谐振器组成的Fano谐振全介质超颖表面中,系统地研究了近红外波段石墨烯与馈电间隙内高度局域化的热之间的强相互作用。数值结果表明,由于石墨烯的本征吸收与局域热点处增强的电场之间的耦合作用,集成石墨烯可以显著降低Fano共振。通过改变费米能级和石墨烯的层数来操纵表面电导率,Fano共振强度获得显著的调制,甚至被关闭。这项工作提供了一个很大的自由度,以定制在纳米尺度上的光-物质相互作用,并开辟了途径,主动可调和集成的纳米光子器件的应用,如光学生物传感,慢光和增强的非线性效应。

英文摘要:

The active photonics based on the two-dimensional material graphene has attracted enormous interests for developing the tunable and compact optical devices with high efficiency. Here we integrate graphene into the Fano-resonant all-dielectric metasurfaces consisting of silicon split resonators, and systematically investigate the strong interaction between graphene and the highly localized hot inside feed gaps in the near infrared regime. The numerical results show that the integrated graphene can substantially reduce the Fano resonance due to the coupling effect between the intrinsic absorption of graphene with enhanced electric field in the localized hotspot. With the manipulation of the surface conductivity via varying Fermi level and the layer number of graphene, the Fano resonance strength obtains a significant modulation and is even switched off. This works provides a great degree of freedom to tailor light-matter interaction at the nanoscale and opens up the avenues for actively tunable and integrated nanophotonic device applications, such as the optical biosensing, slow light and enhanced nonlinear effects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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