Surface characterization by surface plasmon resonance technique

Simanchalo Panigrahi; Nikunja Behari Das; Aseel K. Hassan; Asim K. Ray

doi:10.1117/12.402590

9 October 2000 Surface characterization by surface plasmon resonance technique

Simanchalo Panigrahi, Nikunja Behari Das, Aseel K. Hassan, Asim K. Ray

Proceedings Volume 4221, Optical Measurement and Nondestructive Testing: Techniques and Applications; (2000) https://doi.org/10.1117/12.402590
Event: Optics and Optoelectronic Inspection and Control: Techniques, Applications, and Instruments, 2000, Beijing, China

Abstract

Metallic gold (Au) film of approximately 45nm thick was deposited on the glass slide by vacuum evaporation method under the vacuum 10^-6 Torr. Surface plasmon resonance (SPR) curve was taken in the form of reflected intensity R_p variation as a function of the angle of incidence (theta) for the three layered (glass-Au-air) system and the resulting SPR curve was well fitted by Fresnel's theory to find thickness and optical constants of Au film. The organic overlayers of tetra-undecyl-tetra p- nitrophenylazocalix(4) resorcinarene (Azo 1) compound was deposited by spin coating method. SPR measurements were taken in air as well as in pure water, for an overlayer containing Axo 1 spun on Au coated slides. The large change in the refractive index of water 1.33 as compared to that of air 1.00 causes large shifts in the SPR resonance angle (theta) _SPR. The exact determination of the optical parameters of a organic film can be possible by varying the dielectric medium interfacing the overlayer. SPR data for both media used throughout this work were fitted to Fresnel reflection theory for a four layered (glass-Au-Azol-air or water) system. By varying the Azo 1 film thickness during the fitting procedure different solutions have been obtained for the film dielectric constant and hence its refractive index. The refractive index versus thickness for both media were plotted and from the intersecting point of the two curves an exact solution has been found which gives film optical parameters of organic (Azo 1) overlayers.

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Simanchalo Panigrahi, Nikunja Behari Das, Aseel K. Hassan, and Asim K. Ray "Surface characterization by surface plasmon resonance technique", Proc. SPIE 4221, Optical Measurement and Nondestructive Testing: Techniques and Applications, (9 October 2000); https://doi.org/10.1117/12.402590

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KEYWORDS

Dielectrics

Gold

Surface plasmons

Reflection

Refractive index

Water

Metals

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