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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 19 — Sep. 17, 2007
  • pp: 11952–11958

Ultra-sensitive surface absorption spectroscopy using sub-wavelength diameter optical fibers

F. Warken, E. Vetsch, D. Meschede, M. Sokolowski, and A. Rauschenbeutel  »View Author Affiliations


Optics Express, Vol. 15, Issue 19, pp. 11952-11958 (2007)
http://dx.doi.org/10.1364/OE.15.011952


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Abstract

The guided modes of sub-wavelength diameter air-clad optical fibers exhibit a pronounced evanescent field. The absorption of particles on the fiber surface is therefore readily detected via the fiber transmission. We show that the resulting absorption for a given surface coverage can be orders of magnitude higher than for conventional surface spectroscopy. As a demonstration, we present measurements on sub-monolayers of 3,4,9,10-perylene-tetracarboxylic dianhydride (PTCDA) molecules at ambient conditions, revealing the agglomeration dynamics on a second to minutes timescale.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(240.6490) Optics at surfaces : Spectroscopy, surface
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: August 15, 2007
Revised Manuscript: August 29, 2007
Manuscript Accepted: September 1, 2007
Published: September 5, 2007

Citation
F. Warken, E. Vetsch, D. Meschede, M. Sokolowski, and A. Rauschenbeutel, "Ultra-sensitive surface absorption spectroscopy using sub-wavelength diameter optical fibers," Opt. Express 15, 11952-11958 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-19-11952


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References

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  19. The offset accounts for the fact that spectrum B still contains a monolayer component and thus an admixture of spectrum A.

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