基于MIM谐振腔内嵌金属方芯结构的可调谐Fano共振

设计了一种由内嵌金属方芯的金属-绝缘体-金属方形气腔以及两个侧耦合波导组成的耦合结构, 并采用有限元方法研究了该结构的传播特性.结果表明: 通过对气腔内金属方芯偏离角和偏离距离的调节可以获得并调制Fano共振; 该Fano共振由对称破缺或几何效应影响左右波导和谐振腔之间耦合区域中的场分布强度所致, 场分布模式的变化是由波导模和腔模之间的干涉引起的.此外, Fano共振的光谱位置和调制深度对偏差参数十分敏感, 通过计算不同偏差角及偏差距离下的折射率传感特性发现, 其折射率敏感度最高达1 508 nm/RIU, 品质因数最高达1 308.研究结果为设计更加灵活、简单、高效的片上等离子体纳米传感器提供了理论依据.

Abstract

A coupling structure which consists of a metal-insulator-metal resonator centered off from the metal square core and two side-coupled waveguides is designed. The propagation characteristics of the structure are studied by finite element method. The results show that the Fano resonance can be obtained and modulated by adjusting the deviation angle and deviation distance of the metal core in the cavity. The Fano resonance is caused by the symmetry breaking or geometric effect, which affects the intensity of the field distribution in the coupling region between the left and right waveguides and the cavity. The variation of field distribution mode is caused by the interference between the waveguide mode and the cavity mode. In addition, the spectral position and modulation depth of Fano resonance are very sensitive to the deviation parameters. By calculating the refractive index sensing characteristics under different deviation angles and deviation distances, the refractive index sensitivity is up to 1 508 nm/RIU, and the quality factor is up to 1 308. The research results provide a theoretical basis for designing more flexible, simple and efficient on-chip plasmonic nanosensors.

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何丙乾, 李永红, 曹雅楠, 岳凤英. 基于MIM谐振腔内嵌金属方芯结构的可调谐Fano共振[J]. 光子学报, 2018, 47(11): 1123003. HE Bing-qian, LI Yong-hong, CAO Ya-nan, YUE Feng-ying. Tunable Fano Resonance Based on Metal Square Core Structure Embedded in MIM Resonator[J]. ACTA PHOTONICA SINICA, 2018, 47(11): 1123003.

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