Abstract:
Many researchers have already proved their excellence in the fields of SPR based PCF sensor research work. In the last years, they have proposed great designs with high amplitude sensitivity. But the challenge for designing is that most of the designs exhibit high sensitivity with high loss or they exhibit low sensitivity with low loss. And most importantly the designs become complex in order to achieve high sensitivity. We tried to remove these restrictions and gain high sensitivity with a low loss in simple design where we succeeded. For our thesis paper, we proposed a circular shaped PCF sensor using the principles of SPR. In our proposed design, we compared between circular, elliptical and rectangular airholes for the same design and explored the best results for further investigation. The proposed design is surrounded by a thin Perfectly Matched Layer (PML). A thin gold layer is used as the plasmonic material. TiO2 layer is also used for better adhesion of the gold layer. COMSOL Multiphysics 5.3a and MATLAB was used for the research work. The technique used for the exploration is Finite Element Method (FEM). The proposed design shows highest confinement loss of 340dB/cm and maximum amplitude sensitivity of 1189.46 RIU-1. The wavelength sensitivity of the design is 13,000 nm/RIU. The design also achieved a sensor resolution of 7.69x10-6 which is remarkable. The investigation process covers a wider range of optical spectrum from 0.59 𝜇m to 1 𝜇m. The Refractive Index (RI) of the proposed design ranges from 1.33 to 1.4. For its high amplitude sensitivity and relatively low loss, the proposed design can be used for medical and bio-chemical research.
Description:
Supervised by
Prof. Dr. Mohammad Rakibul Islam
Professor,
Department of Electrical and Electronic Engineering,
Islamic University of Technology (IUT)
