Abstract

The surface plasmon resonance (SPR) phenomenon has commonly been applied in bio-chemical sensors [1]. There are two major coupling mechanisms, a prism or a grating coupler. The grating-coupled sensor chip can be fabricated by low cost nano-imprinting technique [2]. For the detection method, intensity or phase of incident light can be used. In our previous study, we report a phase detection method for the SPR sensor can be tuned by simply rotating the an-alyzer in a heterodyne interferometer (HI) system [3]. In this paper, we apply this method in an image type measurement to a grating- coupled SPR (GCSPR) sensor by using liquid crystal (LC) phase-shift interferometry (PSI) [4]. A prism-coupled SPR using PSI has been reported [5]. Comparing with our previous HI system, the major advantage of the image type PSI system can perform multi-channel measurement.

© 2015 Japan Society of Applied Physics, Optical Society of America