Abstract
Our recently developed method for combinatorial synthesis leads efficiently to linear arrays, where the location of a compound in the array encodes its complete synthetic history. Such arrays prepared using an optical fiber as a linear support can be probed with a fiber-guided pulse, allowing evanescent interaction with fluorescent probe molecules at the core-cladding interface. Optical time-of-flight distinction among output signals of fluorescent regions distributed along the fiber is carried out, allowing for the measurement of the location of the emitting fluorescent probes. A unique two-fiber, double-evanescent process overcomes limitations in spatial discrimination, due to fluorescence decay times in comparison to the speed of light. Investigation of an array of 102 fluorescent regions is described, with discussion of its features and limitations.
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