Sensing Performances of Gaussian-shaped and Double-Side Unsymmetrical Metallic Nano-Gratings

3rd Annual International Workshop on Materials Science and Engineering

Li, Haiying^1 ; Duan, Xuesong^1

School of Sciences, Hebei University of Technology, Tianjin, China^1

关键词: Figure of merit (FOM);    Multiple multipole programs;    Reflectance spectrum;    Reflection properties;    Refractive index sensitivity;    Resonant wavelengths;    Sensing performance;    Surface plasmon resonance sensor;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/250/1/012053/pdf
DOI  :  10.1088/1757-899X/250/1/012053

来源: IOP

【 摘 要 】

A new type of sensing structure which is composed of a Gaussian-shaped and double-side unsymmetrical metallic nano-grating is presented. The reflectance spectra as functions of incident wavelengths in various refrective index conditions are analyzed by means of multiple multipole program (MMP) method. Our numerical simulation results show that the refractive index sensitivity (RIS) ∼680 nm/RIU and the full-width at half-maximum (FWHM) ∼3.5 nm can be obtained. The figure of merit (FOM) is over 190 RIU-1. The resonant wavelength increases almost linearly with increasing of the refractive index of samples. These reflection properties not only give an insight into the physical mechanisms of the double-side unsymmetrical gratings, but also make this kind of nano-gratings more suitable to be used in the surface plasmon resonance (SPR) sensors.