Journal
OPTICS LETTERS
Volume 36, Issue 16, Pages 3188-3190Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.003188
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Funding
- Deutsche Forschungsgemeinschaft (DFG)
- State of Baden-Wurttemberg through the DFG-Center for Functional Nanostructures [A 1.04, C 3.02]
- Future and Emerging Technologies (FET) program
- European Commission [213390]
- Bundesministerium fur Bildung und Forschung
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We report on femtosecond pump-probe experiments on two different photoinitiators in solution. These two molecules have recently appeared as attractive candidates for far-field optical lithography based on stimulated-emission-depletion (STED) inspired approaches aiming at beating Abbe's diffraction limit. For the case of 7-diethylamino-3-thenoylcoumarin (DETC), we find that stimulated emission clearly dominates over excited-state absorption, whereas the opposite holds true for the case of isopropylthioxanthone. We argue that it is desirable that stimulated emission dominates over excited-state absorption as depletion mechanism in STED photoresists. Thus, DETC is an attractive corresponding photoinitiator. (C) 2011 Optical Society of America
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