Triangular Nanoparticle Based Plasmonic Biosensor | [Sindh University Research Journal • 2020]

Author(s):

1. M. CHANDIO: Department of Electronic Engineering, Quaid-e-Awam University of Engineering, Science,and Technology, Nawabshah. Pakistan

2. A. A. JAMALI: Department of Electronic Engineering, Quaid-e-Awam University of Engineering, Science,and Technology, Nawabshah. Pakistan

3. F. A. JOKHIO: Department of Computer Engineering, Quaid-e-Awam University of Engineering, Science, and Technology, Nawabshah, Pakistan

4. M. R. ANJUM: Department of Electronic Engineering, The Islamia University Bahawalpur, Pakistan

5. Z. A. ARAIN: Department of Telecommunication Engineering, Mehran UET, Jamshoro.,Pakistan

6. P. SOOTHAR: Department of Electronic Engineering, Mehran UET, Jamshoro, Pakistan

Abstract:

This paper presents the theoretical investigation of a novel metal-insulator-metal based plasmonic perfect absorber for biosensing applications. The electromagnetic simulations are performed using finite integration technique (FIT) based simulation softrware i.e. CST Microwave Studio. The electromagnetic analysis are useful in demonstrating the effect of field enhancement in the sensing region of a biosensor. It also depicts the spectral shift of field enhancementas a function of variations in the refractive indices of a sensing medium defined as a sensitivity of biosensor. If the spectral shift is high with a small variation in refractive index of a sensing medium, then sensor is said to be a highly sensitive. The sensitivity of a plasmonic sensors depend on the geometry of the structure. Here, a novel metal-insulator-metal based PPA structure is considered for analysis. The novel approach uses triangular gold nanoparticles at the vicinity of the sensing medium. Due to the sharp edges of the triangular nanoparticles, high field is enhanced towards the sensing medium as compared to the conventional metal-insulator-metal based PPA biosensors. The simulation results show effects of field enhancement, spectral shifts of the absorption in the sensitivity. Results are useful for the design of a novel PPA biosensor.

Page(s): 199-204

DOI: DOI not available

Published: Journal: Sindh University Research Journal, Volume: 52, Issue: 2, Year: 2020

Keywords:

Spectral Sensitivity , PPA , SPR biosensor , Triangular Nanoparticles , biosensing , LSPR biosensor

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