Theoretical study of modulated multi-layer SPR device for improved refractive index sensing

International Conference on Advances in Materials and Manufacturing Applications 2017

Mohapatra, Saswat^1 ; Moirangthem, Rakesh S.^1

Nanophotonics Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad

826004, India^1

关键词: Ambient interfaces;    Biological sensors;    Multilayer structures;    Plasmonic sensors;    Refractive index sensing;    Sensing performance;    Theoretical investigations;    Theoretical study;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/310/1/012017/pdf
DOI  :  10.1088/1757-899X/310/1/012017

来源: IOP

【 摘 要 】

In the present work, a theoretical investigation of Surface Plasmon Resonance (SPR) properties of a multilayer film (Au-SiO2-Au) coated on a glass prism is being carried out. In this multilayer structure, each interface corresponds to multiple SPR modes. To obtain the maximum reflection dips in the SPR modes, the thickness of SiO2layer is optimized by varying it from 100-600 nm. Our calculation also reveals that SPR mode corresponding to Au-ambient interface is very sensitive to the changes in the surrounding medium, least affecting other SPR modes. The sensing performance of the proposed nano-plasmonic sensor is theoretically calculated using bulk refractive index sensing. Such multilayer SPR sensing device has advantages over conventional SPR devices in terms of their bulk sensitivity and self-referencing, claiming itself as a potential candidate for the development of highly sensitive biological sensor.