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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 9 — Mar. 20, 1999
  • pp: 1481–1487

Single-Molecule Analysis of Ultradilute Solutions with Guided Streams of 1-–m Water Droplets

Chung-yi Kung, Michael D. Barnes, Noah Lermer, William B. Whitten, and J. Michael Ramsey  »View Author Affiliations


Applied Optics, Vol. 38, Issue 9, pp. 1481-1487 (1999)
http://dx.doi.org/10.1364/AO.38.001481


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Abstract

We describe instrumentation for real-time detection of single-molecule fluorescence in guided streams of 1-μm (nominal) water droplets. In this technique, target molecules were confined to droplets whose volumes were comparable with illumination volumes in diffraction-limited fluorescence microscopy and guided to the waist of a cw probe laser with an electrostatic potential. Concentration detection limits for Rhodamine 6G in water were determined to be ~1 fM, roughly 3 orders of magnitude lower than corresponding limits determined recently with diffraction-limited microscopy techniques for a chemical separation of similar dyes. In addition to its utility as a vehicle for probing single molecules, instrumentation for producing and focusing stable streams of 1–2-μm-diameter droplets may have other important analytical applications as well.

© 1999 Optical Society of America

OCIS Codes
(180.0180) Microscopy : Microscopy
(180.1790) Microscopy : Confocal microscopy
(260.2510) Physical optics : Fluorescence
(350.3950) Other areas of optics : Micro-optics

Citation
Chung-yi Kung, Michael D. Barnes, Noah Lermer, William B. Whitten, and J. Michael Ramsey, "Single-Molecule Analysis of Ultradilute Solutions with Guided Streams of 1-–m Water Droplets," Appl. Opt. 38, 1481-1487 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-9-1481


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