Influence of electromagnetic (EM) waves polarization modes on surface plasmon resonance

Noor Faezah Murat,P Susthitha Menon,Awangku Abdul Rahman Awangku Yussuf,Wan Maisarah Mukhtar,Karsono Ahmad Dasuki,Affa Rozana Abdul Rashid,Mohamad Halim Abd Wahid

doi:10.1051/epjconf/201716201008

Noor Faezah Murat, P Susthitha Menon + Show 5 more

Open Access

https://doi.org/10.1051/epjconf/201716201008

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Abstract

Optical sensor based on surface plasmon resonance are widely used for various applications. In this paper, an optimization of EM waves polarization modes for the occurrence of SPR by using a modified optical waveguiding assembly has been discussed. A 633 nm of linearly polarized He-Ne laser was appointed as a light source. The polarization modes were controlled by rotating the position of He-Ne laser. It was found that the optimum SPR signal with reflectance, R = 0.21 a.u and SPR angle, θSPR = 48° can be obtained as the position of laser was rotated at 90°, with the presence of polarizer. The location of the critical angle was observed at θC = 46°. For the validation purpose, a simulation based on Fresnel equation was conducted where the percentage difference between the experimental and theoretical results were analyzed. The percentage difference between experimental and theoretical results for both θSPR and θC were 9.09% and 15.00% respectively. In conclusion, an excellent agreement between the theoretical and experimental findings proved the stability of this SPR setup, where the EM waves polarization can easily be controlled by manipulating the position of laser.

Highlights

Surface plasmon resonance (SPR) technique has been used as one of the optical detection due to its powerful device for monitoring interactions in biological system [1]
This can be concluded that SPR is a phenomenon that involving the interaction of matter and polarized light while surface plasmon polariton (SPP) is an excitation of photon in SPR
It can detect the small change of the refractive index on the metal surface by showing a sharp dip of curved which represent the minimum reflectance in SPR phenomenon [6]

Summary

Introduction

Surface plasmon resonance (SPR) technique has been used as one of the optical detection due to its powerful device for monitoring interactions in biological system [1]. SPR is an optical method for measuring the refractive index of very thin layers of material adsorbed on a metal [5]. This can be concluded that SPR is a phenomenon that involving the interaction of matter and polarized light while surface plasmon polariton (SPP) is an excitation of photon in SPR. It can detect the small change of the refractive index on the metal surface by showing a sharp dip of curved which represent the minimum reflectance in SPR phenomenon [6]. It happens when ppolarized light strikes a thin-film metal under the condition of total internal reflection (TIR) [7]

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