材料科学
折射率
超材料
纳米尺度
灵敏度(控制系统)
生物传感器
光学
棱镜
等离子体子
时域有限差分法
红外线的
光电子学
纳米技术
电子工程
物理
工程类
作者
M. A. Baqir,Ali Farmani,Tehreem Fatima,Muhammad Qamar Raza,Saleem Farooq Shaukat,Ali Mir
出处
期刊:Applied Optics
[The Optical Society]
日期:2018-10-30
卷期号:57 (31): 9447-9447
被引量:113
摘要
A plethora of research in recent years has been reported on biosensing in the surface plasmon resonant systems. However, very little research has reported a tunable and highly sensitive biosensor in a nanoscale platform. In this regard, we propose a nanoscale hyperbolic metamaterial (HMM)-based prism coupled waveguide sensor (PCWS) in the near-infrared range. The HMM layer makes up one of the constituents of the PCWS—comprised of a periodically arranged assembly of silver nanostrips. The structure is numerically simulated by the finite difference time domain method. It is demonstrated that the sensitivity of the reflected light can be tuned through the refractive index (RI) of the solution. Moreover, the effects of alteration of constituents of PCWS on the sensitivity have been analyzed. Results show that the sensitivity of PCWS can be harnessed by altering the thickness, slant angle of HMM layer, volume fraction (f) of metal in the HMM layer, and the incidence angle of light. For this purpose, the structure is numerically simulated by the finite difference time domain method. In the optimum design of the proposed sensor, the maximum value of sensitivity is achieved as high as S=3450 nm/refractive index unit with θ=10° and ϕ=10° and a metamaterial thickness of 250 nm. Moreover, the structure has a nanoscale footprint of 600 nm×400 nm×200 nm.
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