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Journal of Biomedical Optics

Evanescent-imaging-ellipsometry-based microarray reader
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Paper Abstract

We describe the development of a label-less ellipsometric imaging microarray reader. The ability of the ellipsometric microarray reader to measure binding of sample to microarray surface is verified using oligonucleotide complementary DNA (cDNA) microarrays. Polarized light illuminates the microarray surface through a glass substrate at an angle beyond the critical angle and changes in the polarization of totally internally reflected light resulting from binding events on the microarray surface are measured. This polarization change is used to measure the thickness of biomolecules bound to the microarray. A prototype ellipsometric imaging microarray reader is constructed and calibrated, and the performance is evaluated with cDNA microarrays. The microarray reader measures changes in refractive index changes as small as 0.0024 and thickness changes as small as 0.28 nm. The optimization of angle of incidence and substrate refractive index necessary to achieve high sensitivity is also described. This ellipsometric technique offers an attractive alternative to fluorescence-microarray readers in some genomic, proteomic, diagnostic, and sensing applications.

Paper Details

Date Published: 1 January 2006
PDF: 9 pages
J. Biomed. Opt. 11(1) 014028 doi: 10.1117/1.2166407
Published in: Journal of Biomedical Optics Volume 11, Issue 1
Show Author Affiliations
Srivatsa Venkatasubba Rao, Intelligent Optical Systems, Inc. (United States)
Neil A. Beaudry, College of Optical Sciences/The Univ. of Arizona (United States)
Yanming Zhao, College of Optical Sciences/The Univ. of Arizona (United States)
Russell A. Chipman, College of Optical Sciences/The Univ. of Arizona (United States)

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