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26 December 2024

» arxiv » cond-mat/0701264

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Ultra-sensitive surface absorption spectroscopy using sub-wavelength diameter optical fibers
F. Warken ; E. Vetsch ; D. Meschede ; M. Sokolowski ; A. Rauschenbeutel ;
Date:	12 Jan 2007
Subject:	Soft Condensed Matter
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.
Source:	arXiv, cond-mat/0701264
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