Fano resonances based on plasmonic square resonator with high figure of merits and its application in glucose concentrations sensing

被引:0
|
作者
Mohammad Reza Rakhshani
机构
[1] University of Zabol,Faculty of Engineering
来源
Optical and Quantum Electronics | 2019年 / 51卷
关键词
Sensors; Collective excitations; Biological and medical applications; Optical waveguides and couplers;
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学科分类号
摘要
A compact plasmonic structure is proposed employing symmetrical metal–insulator-metal (MIM) waveguides coupled to the square resonator for nano-sensing applications, especially for water glucose sensing. Finite difference time domain method is chosen to derivate the output characteristics and magnetic-field distributions. Outcomes illustrate the Fano resonance in the output characteristics can be simply managed by varying the inner and outer lengths and the refractive index of the square cavity. Also, between Fano resonance wavelength and resonator length, a linear behavior exists. These features suggest that physical parameters provide flexibility to propose the structure. Our plasmonic device produces a sensitivity and figure of merit of about 6400 nm/RIU and 1 × 104, respectively. By utilizing the mathematical model for water refractive index, we aim to develop a sensor structure to detect the glucose concentration in water. This designed sensor may discover significant applications in future nanosensing domain.
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