ENHANCEMENT IN SENSITIVITY OF A SURFACE PLASMON RESONANCE SENSOR WITH Al_xGa_1-xAs, 70% Al

Abstract

The sensitivities of an aluminum gallium arsenide Al 0.7 Ga 0.3 As-based surface plasmon resonance (SPR) sensor with gold (Au) and silver (Ag) layers are numerically analyzed and compared at 633 nm wavelength for different thicknesses of the Al 0.7 Ga 0.3 As. As the thickness of Al 0.7 Ga 0.3 As increases, the sensitivity of aluminum gallium arsenide Al 0.7 Ga 0.3 As with a specific metal (Au or Ag) layer increases. Our calculations show that the sensitivities of the proposed sensors are 80.55% (Au film) and 34.74% (Ag film) higher than the conventional Au and Ag sensors successively. The aluminum gallium arsenide Al 0.7 Ga 0.3 As-based SPR sensor has the advantages of high angular sensitivity, narrow resonance widths, and low minimum reflectance, making it a much better choice for biosensing applications.

Optical biosensor based on enhanced surface plasmon resonance: theoretical optimization

“…Studying the power of the reflected electromagnetic wave from an N-layer structure displayed in Fig. 1A for a TM electromagnetic wave polarization, the reflectance (R), is obtained by Guerinik and Tayeboun (2020).…”

“…Abdulhalim et al improved the performance of the biosensor by combining a layer of high refractive index with the metallic sheet (Shalabney and Abdulhalim 2011;Lahav et al 2008). Guerinik et al introduced an Al x Ga 1−x As 70% Al on top of the gold/silver sheet as an SPR biosensor (Guerinik and Tayeboun 2020). Also, Chabot et al manufactured a responsive sensor by utilizing SPR (Chabot et al 2012).…”