Journal
BIOSENSORS & BIOELECTRONICS
Volume 20, Issue 10, Pages 2177-2180Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2004.09.011
Keywords
surface plasmon resonance; optical phase
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We report a real-time differential phase measurement technique which can be implemented in optical surface plasmon resonance biosensors. The important feature of our design is that sensitivity has been greatly improved by measuring the differential phase change between the s and p-polarizations. Real-time measurement capability is achieved by using a phase extracting routine which continuously monitors the waveforms captured by two photo-detectors. Measurement capability of our setup is demonstrated through real-time monitoring of bovine serum albumin (BSA)/anti-BSA binding reaction. The estimated sensitivity of our current setup is 7.4 ng/ml. (c) 2004 Elsevier B.V. All rights reserved.
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