Abstract

The phenomenon of surface plasmon resonance (SPR) is used for detection of biomolecules, medical diagnostics and gas analysis [1]. SPR is an optical phenomenon in which TM polarized light beam excites the surface plasmon polaritons (SPP) at metal-dielectric interface. These polaritons could be excited by grating coupling. Generally, gold (Au), aluminum (Al), and silver (Ag) are used as SPR active material. For a good sensor, very narrow SPR reflection spectrum is required. Al grating offers narrower SPR spectrum but it is chemically less stable. While Au grating is chemically more stable but does not provide narrow SPR spectrum.

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