Approach the angular sensitivity limit in surface plasmon resonance sensors with low index prism and large resonant angle

OPTICAL ENGINEERING(2010)

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Abstract
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. (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3431662]
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Key words
surface plasmons,sensors,biochemical optics
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