Affiliation:
1. Department of Electronics and Communication Engineering, NIT Warangal, Warangal, (T.S.), India
Abstract
Background:
Surface plasmon resonance (SPR) based fibre optic sensors are becoming increasingly
popular in biomedical applications. However, the sensor performance is degraded because of
low sensitivity with inadequate detection accuracy and figure of merit.
Objectives:
The first objective of this study is to design a D-shaped photonic crystal fibre (PCF) using
COMSOL multiphysics. The second objective is to enhance the performance of the designed sensor in
terms of sensitivity and detection accuracy using single and dual metal layer structures. In addition, the
performance of the proposed sensor is compared with the existing one.
Methods:
In this study, the performance of the PCF-SPR sensor is improved using a D-shaped photonic
crystal fibre (PCF) and two metals as grating layers. The work in this paper is divided into two parts. In
the first part, the gold metal layer with optimized thickness is used to achieve good sensitivity. In the
second part, the combination of gold and silver dual metal layers with optimized thickness is used to
achieve good detection accuracy. Moreover, the performance of the proposed sensor is compared to other
published D-shaped PCF sensors.
Results:
The proposed D-shaped PCF-SPR sensor is designed and simulated using COMSOL multiphysics.
The results in terms of sensitivity (S) and detection accuracy (DA) are obtained using a single metal
layer and dual metal layers with optimum thickness. Moreover, the transmission coefficient and loss
curve have been calculated using different refractive indices of the material. In addition, the simulation
results are validated for cancer detection using the proposed sensor.
Conclusion:
An improvement of the D-shaped PCF sensor for cancer detection is presented in terms of S
and DA using single or dual metal layer structures and COMSOL multiphysics. In a single metal layer
structure, only gold is used as a grating layer, and the thickness of the grating layer is optimized for
achieving high sensitivity. Similarly, a combination of gold and silver is used as the grating layer in the
dual metal layer structure for achieving a high DA. Moreover, the obtained results of the proposed PCFSPR
sensor are compared with the published results and found that the proposed sensor can be used with
a high degree of S and DA for biomedical applications and also can be used in the bio-sensing field.
Publisher
Bentham Science Publishers Ltd.
Cited by
1 articles.
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