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Applied Optics

Applied Optics


  • Vol. 41, Iss. 16 — Jun. 1, 2002
  • pp: 3336–3342

Parallel Fluorescence Detection of Single Biomolecules in Microarrays by a Diffractive-Optical-Designed 2 x 2 Fan-Out Element

Hans Blom, Mathias Johansson, Anna-Sara Hedman, Liselotte Lundberg, Anders Hanning, Sverker Hård, and Rudolf Rigler  »View Author Affiliations

Applied Optics, Vol. 41, Issue 16, pp. 3336-3342 (2002)

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We have developed a multifocal diffractive-optical fluorescence correlation spectroscopy system for parallel excitation and detection of single tetramethylrhodamine biomolecules in microarrays. Multifocal excitation was made possible through the use of a 2 × 2 fan-out diffractive-optical element with uniform intensity in all foci. Characterization of the 2 × 2 fan-out diffractive-optical element shows formation of almost perfect Gaussian foci of submicrometer lateral diameter, as analyzed by thermal motion of tetramethylrhodamine dye molecules in solution. Results of parallel excitation and detection in a high-density microarray of circular wells show single-biomolecule sensitivity in all four foci simultaneously.

© 2002 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(170.1790) Medical optics and biotechnology : Confocal microscopy
(170.2520) Medical optics and biotechnology : Fluorescence microscopy
(300.2530) Spectroscopy : Fluorescence, laser-induced

Hans Blom, Mathias Johansson, Anna-Sara Hedman, Liselotte Lundberg, Anders Hanning, Sverker Hård, and Rudolf Rigler, "Parallel Fluorescence Detection of Single Biomolecules in Microarrays by a Diffractive-Optical-Designed 2 x 2 Fan-Out Element," Appl. Opt. 41, 3336-3342 (2002)

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