Tunable compact nanosensor based on Fano resonance in a plasmonic waveguide system

Ren Xiaobin; Ren Kun; Cai Yuanxue

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Tunable compact nanosensor based on Fano resonance in a plasmonic waveguide system

机译：基于FANO谐振在等离子体波导系统中的可调谐紧凑型纳米传感器

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An ultracompact plasmonic refractive index sensor based on Fano resonance is proposed. The sensor comprises a metal - insulator - metal waveguide with a stub and a side-coupled split-ring resonator. The effect of structural parameters on Fano resonance and the refractive index sensitivity of the system are analyzed in detail by investigating the transmission spectrum. Simulation results show that Fano resonance has different dependences on the parameters of the sensor structure. The reason is further discussed based on the field pattern. The peak wavelength and lineshape can be easily tuned by changing the key parameters. Furthermore, dual Fano resonance effects with different frequency intervals are obtained, which are mainly induced by the symmetry breaking of the structure. The proposed sensor yields sensitivity higher than 1.4 x 10(3) nm/RIU and a figure of merit of 1.2 x 10(5). The sensitivity and figure of merit can be further improved by optimizing the geometry parameters. (C) 2017 Optical Society of America

机译：提出了一种基于FANO谐振的超自然等离子体折射率传感器。传感器包括金属绝缘体 - 金属波导，具有短截线和侧耦合的分体环谐振器。通过研究传输光谱，详细分析了结构参数对FANO共振的影响和系统的折射率敏感性。仿真结果表明，扇形谐振对传感器结构的参数有不同的依赖性。基于现场模式进一步讨论了原因。通过改变关键参数，可以轻松调整峰值波长和线φ。此外，获得具有不同频率间隔的双扇形共振效应，其主要由结构的对称性断裂引起。所提出的传感器产生高于1.4×10（3）Nm / Riu的敏感性，以及1.2×10（5）的优点。通过优化几何参数，可以进一步提高灵敏度和优点。（c）2017年光学学会

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《Applied optics》 |2017年第31期|共9页
作者
Ren Xiaobin; Ren Kun; Cai Yuanxue;
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Tianjin Univ Sci &

Technol Sch Sci Tianjin 300222 Peoples R China;

Tianjin Univ Minist Educ Coll Precis Instrument &

Optoelect Engn Tianjin 300072 Peoples R China;

Tianjin Univ Sci &

Technol Sch Sci Tianjin 300222 Peoples R China;

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Tunable compact nanosensor based on Fano resonance in a plasmonic waveguide system

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