Common-path interferometric detection of protein monolayer on the BioCD.

Common-path interferometric detection of protein monolayer on the BioCD. Research Abstract Details 

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Common-path interferometric detection of protein monolayer on the BioCD. Abstract Text:

Xuefeng Wang,Ming Zhao,D D Nolte,Xuefeng Wang,Ming Zhao,D D Nolte,

The bio-optical compact disk (BioCD) is an optical biosensor that performs common-path molecular interferometry of patterned proteins on a disk spinning at high speed. The common-path configuration makes it ultrastable and allows surface height precision below 10 pm. In this paper we show that two complementary interferometric quadrature conditions exist simultaneously that convert the modulus and phase of the reflection coefficient, modulated by protein patterns on the disk surface, into intensity modulation at the detector. In the far field they separate into spatially symmetric and antisymmetric intensity modulation in response to the local distribution of protein. The antisymmetric response is equivalent to differential phase-contrast detection, and the symmetric response is equivalent to in-line (IL) common-path interferometry. We measure the relative sensitivities of these orthogonal channels to printed protein patterns on disk structures that include thermal oxide on silicon and Bragg dielectric stacks. The scaling mass sensitivity of the IL channel on oxide on silicon was measured to be 0.17 pg/mm.

Common-path interferometric detection of protein monolayer on the BioCD. Publishing Authors By Initials

X Wang,M Zhao,DD Nolte,X Wang,M Zhao,DD Nolte,

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Common-path interferometric detection of protein monolayer on the BioCD. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Applied optics

VOLUME: 46

Page Numbers: 7836-49

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ISSN: 0003-6935

DAY: 10

MONTH: Nov

YEAR: 2007

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LANGUAGE: eng

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Country: United States

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MEDLINETA: Appl Opt

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