Optical Chemical Sensing Using The Surface Plasmon Absorption Line

Li-Ming Zhang; D. Uttamchandani

doi:10.1117/12.949332

10 March 1989 Optical Chemical Sensing Using The Surface Plasmon Absorption Line

Li-Ming Zhang, D. Uttamchandani

Proceedings Volume 1012, In-Process Optical Measurements; (1989) https://doi.org/10.1117/12.949332
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

Surface plasmon waves are perpendicularly polarised electro-magnetic waves which exist at boundaries between metals and dielectrics. The interest in surface plasmons from a measurement point of view arises from the fact that they can be excited optically and that their Oopagation is a sensitive function of the complex dielectric constants of the materials forming the interface. For chemical sensing, an interface is formed between the analyte (the dielectric) and a thin metal film. Surface plasmons are excited at this interface using a diverging laser beam which is reflected off the metal/analyte interface. Analysis of the reflected light shows a narrow dark line corresponding to energy being coupled to the surface wave. The position of this absorption line changes when the refractive index of the analyte changes. In our measurements, the analyte is a solution of acetone in water. By increasing the concentration of this solution its refractive index changes. By using an appropriate detector, the change in the position of the absorption line has been detected. Measurements made to deduce the concentration of the analyte by this technique are reported.

Citation Download Citation

Li-Ming Zhang and D. Uttamchandani "Optical Chemical Sensing Using The Surface Plasmon Absorption Line", Proc. SPIE 1012, In-Process Optical Measurements, (10 March 1989); https://doi.org/10.1117/12.949332

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KEYWORDS

Surface plasmons

Metals

Dielectrics

Chemical analysis

Absorption

Interfaces

Sensors

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