Highly sensitive plasmonic grating sensor with zinc oxide layer

Author's Department

Physics Department

Third Author's Department

Physics Department

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https://doi.org/10.1117/12.3043678

All Authors

Mostafa Sayed A. M. Faramawy Mohamed A. Swillam

Document Type

Research Article

Publication Title

Proceedings of SPIE the International Society for Optical Engineering

Publication Date

1-1-2025

doi

10.1117/12.3043678

Abstract

Surface Plasmon Polariton resonant sensors (SPPs) have found wide-ranging applications, particularly for nanoscale sensing. The SPP dispersion is determined by the properties of a limited number of suitable metals and cannot be arbitrarily tuned. The proposed biosensor is based on the surface plasmon polariton manipulated in the metamaterial surface. The plasmonic sensor utilizes a metal-air interface to detect and analyze various substances and phenomena in visible light range. Finite difference time domain (FDTD) method is used to calculate a reflected signal from the proposed structure with analyte material. The biosensor structure is a grating structure with a thin film of gold and a base layer of zinc oxide (ZnO). In this work, a plasmonic grating is proposed for sensing and detecting the refractive index changes in wavelength range between 300 nm and 700 nm. To test the performance of the plasmonic sensor, a commercial Lumerical software based on finite difference time domain (FDTD) has been used. The suggested design shows high sensitivity at λ = 664.452 nm, and it can be used for biosensing applications.

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