Independently tunable triple Fano resonances in plasmonic waveguide structure and its applications for sensing

IF 1.1 4区 物理与天体物理 Q4 NANOSCIENCE & NANOTECHNOLOGY
Qiaohuan Wu, Yingqiu Zhang, Desheng Qu
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引用次数: 1

Abstract

Abstract. A surface plasmon polaritons (SPPs) waveguide structure composed of a metal–insulator–metal waveguide with a baffle, a special square cavity (SSC), and a ring cavity (RC), is proposed to realize independent tuning in triple Fano resonances. Using the finite element method, the magnetic field distributions and optical transmission spectra of the structure are analyzed in detail. The simulation results show that the structure achieves triple Fano resonances originated from two different mechanics. One of Fano resonances occurs in the RC, and the others occur in SSC. By regulating the structure parameters of the SSC and RC, these Fano resonances can be well tuning, and independently tuning is realized in multiple Fano resonances, which provides flexibility for the structure to be applied to optical devices. In addition, the structure exhibits great performances in refractive index sensing and biosensing. The maximum sensitivity of refractive index sensing achieves 2350 nm/RIU, and there is a good linear relationship between resonance wavelength and refractive index. Due to great sensitivity and independent tunability, the SPPs waveguide structure may be potentially used in micronano-optical devices, especially in optical on-chip sensor.
等离子体波导结构中独立可调谐三范诺共振及其传感应用
摘要提出了一种由带挡板的金属-绝缘体-金属波导、特殊方腔(SSC)和环形腔(RC)组成的表面等离子体激元(SPPs)波导结构,以实现三重Fano谐振的独立调谐。采用有限元方法,对该结构的磁场分布和光透射光谱进行了详细分析。仿真结果表明,该结构实现了源于两种不同力学的三次Fano共振。其中一个Fano共振发生在RC中,另一个发生在SSC中。通过调节SSC和RC的结构参数,可以很好地调谐这些Fano谐振,并且在多个Fano谐振中实现独立调谐,这为应用于光学器件的结构提供了灵活性。此外,该结构在折射率传感和生物传感方面表现出良好的性能。折射率传感的最大灵敏度达到2350nm/RIU,谐振波长与折射率之间存在良好的线性关系。由于SPP波导结构具有很高的灵敏度和独立的可调谐性,因此有可能用于微纳米光学器件,尤其是光学片上传感器。
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来源期刊
Journal of Nanophotonics
Journal of Nanophotonics 工程技术-光学
CiteScore
2.60
自引率
6.70%
发文量
42
审稿时长
3 months
期刊介绍: The Journal of Nanophotonics publishes peer-reviewed papers focusing on the fabrication and application of nanostructures that facilitate the generation, propagation, manipulation, and detection of light from the infrared to the ultraviolet regimes.
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