Abstract:
We proffer in this research a distinctive, facile to fabricate, and highly sensitive photonic
crystal fiber (PCF) biosensor based on the phenomenon of surface plasmon resonance (SPR).
Our prototype has a strategic pattern of circular air holes inside the fiber, which leads to a
superior sensing performance. The evaluation of all the sensor characteristics has been
discharged by employing the finite element method (FEM) of COMSOL Multiphysics. The
gold (Au) layer just around the fiber acts as the plasmonic material. After the optimization of
all the fiber parameters, we derived a maximum amplitude sensitivity (AS) and wavelength
sensitivity (WS) of 2202.64 RIU− 1 and 140,500 nm/RIU, respectively, with a maximum
sensor resolution 7.11 × 10− 7
for wavelength and 4.54 × 10− 4
for amplitude. Moreover, the
maximum figure of merit (FOM) procured was 2285. The overall analyte sensing range is
from refractive indices 1.31 to 1.40, and the sensor has a fabrication tolerance limit of ±5%
for the gold layer variation and ±2.5% for both of the air holes. With its enhanced
performance in terms of sensitivity, we believe that this SPR-based PCF biosensor can
potentially contribute to the detection of unknown analytes and in applications of medical
diagnostics.
Description:
Supervised by
Prof. Dr. Mohammad Rakibul Islam,
Department of Electrical and Electronic Engineering (EEE)
Islamic University of Technology (IUT)
Board Bazar, Gazipur, Bangladesh
This thesis is submitted in partial fulfillment of the requirement for the degree of Bachelor of Science in Electrical and Electronic Engineering, 2024
