光学
波导管
低语长廊波浪
表面等离子共振
表面等离子体子
表面等离子体激元
分裂环谐振器
电介质
Q系数
超材料
波长
作者
Mahdiye Rahmatiyar,Majid Afsahi,Mohammad Danaie
出处
期刊:Plasmonics
[Springer Nature]
日期:2020-08-03
卷期号:15 (6): 2169-2176
被引量:38
标识
DOI:10.1007/s11468-020-01238-z
摘要
In this paper, a novel nanoscale refractive index sensor topology, which incorporates a ring resonator containing circular tapered defects coupled to a metal-insulator-metal (MIM) plasmonic waveguide with tapered defects, is proposed. For the proposed design, the effect of introduction of defects on transmittance value, shape of magnetic field, and sensor parameters such as sensitivity (S) and figure of merit (FOM) are investigated numerically and simulated using finite-difference time-domain (FDTD) method. By optimizing the ring radius and selecting the appropriate waveguide width, we have achieved a maximum sensitivity of 1295 nm per refractive index unit (RIU) and a fairly high FOM equal to 159.6 RIU−1. The structure can be used as a high accuracy refractive index sensor for refractive indices ranging from 1 to 1.65. Due to the small size, wide detection range, and the high detection resolution of the proposed sensor, it is a good choice for integrated bio-sensing applications.
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