期刊
OPTICS EXPRESS
卷 15, 期 19, 页码 11952-11958出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.15.011952
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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. (C) 2007 Optical Society of America.
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