title: Two-dimensional biosensor arrays based on surface plasmon resonance phase imaging.
abstract: We present a biosensor design based on capturing the two-dimensional (2D) phase image of surface plasmon resonance (SPR). This 2D SPR imaging technique may enable parallel label-free detection of multiple analytes and is compatible with the microarray chip platform. This system uses our previously reported differential phase measurement approach, in which 2D phase maps obtained from the signal (P) and reference (S) polarizations are compared pixel by pixel. This technique greatly improves detection resolution as the subtraction step can eliminate measurement fluctuations caused by external disturbances as they essentially appear in both channels. Unlike conventional angular SPR systems, in which illumination from a range of angles must be used, phase measurement requires illumination from only one angle, thus making it well suited for 2D measurement. Also, phase-stepping introduced from a moving mirror provides the necessary modulation for accurate detection of the phase. In light of the rapidly increasing need for fast real-time detection, quantification, and identification of a range of proteins for various biomedical applications, our 2D SPR phase imaging technique should hold a promising future in the medical device market.
authors.affiliation: Center for Advanced Research in Photonics, The Chinese University of Hong Kong, China.
authors.forename: C L
authors.initials: CL
authors.lastname: Wong
authors.forename: H P
authors.initials: HP
authors.lastname: Ho
authors.forename: T T
authors.initials: TT
authors.lastname: Yu
authors.forename: Y K
authors.initials: YK
authors.lastname: Suen
authors.forename: Winnie W Y
authors.initials: WW
authors.lastname: Chow
authors.forename: S Y
authors.initials: SY
authors.lastname: Wu
authors.forename: W C
authors.initials: WC
authors.lastname: Law
authors.forename: W
authors.initials: W
authors.lastname: Yuan
authors.forename: W J
authors.initials: WJ
authors.lastname: Li
authors.forename: S K
authors.initials: SK
authors.lastname: Kong
authors.forename: Chinlon
authors.initials: C
authors.lastname: Lin
mesh_terms: D001704:Biopolymers / Q000032:analysis*; D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D020411:Oligonucleotide Array Sequence Analysis / Q000295:instrumentation* / Q000379:methods; D055095:Optics and Photonics / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods
chemical_list: D001704:Biopolymers