A Fabry-Perot interference enhanced surface plasmon resonance (SPR) sensor was designed and analyzed
numerically. In this paper, a micro-fluidic channel with two parallel interfaces formed on the metal film of an angularinterrogated
SPR sensor was employed. The shift of the narrow reflection dips as a function of the refractive index
change of the fluid (angular sensitivity Sθ ) was very high. Meanwhile, the angular dip width δθFWHM was very narrow (<0.01°) and can be adjusted by changing the thickness of the resonant cavity. The corresponding intrinsic sensitivity IS = Sθ/δθFWHM higher than 105 RIU-1 around the resonant angle can be achieved.
Surface plasmon resonance (SPR) sensors have been studied thoroughly for the past two decades. However, we found that the angular sensitivity in a prism-coupled SPR sensor can be as high as 500 deg/refractive index unit (RIU), which is two times higher than the sensitivity that has ever been achieved in previous studies. Such a high angular sensitivity can be fully achieved by simply choosing a proper low-index prism and a sufficiently large resonant angle for the light signal at an appropriate wavelength with an optimal metal film thickness. A feasible implementation of such an SPR sensor design concept was also proposed, and an even higher sensitivity of 600 deg/RIU can be achieved.
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