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Biosens Bioelectron. 2005 Apr 15;20(10):2177-80.

Real-time optical biosensor based on differential phase measurement of surface plasmon resonance.

Author information

1
Department of Electronic Engineering, Center for Advanced Research in Photonics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR of China, Hong Kong. hpho@ee.cuhk.edu.hk

Abstract

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.

PMID:
15741095
DOI:
10.1016/j.bios.2004.09.011
[Indexed for MEDLINE]
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