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Opt Lett. 2011 Aug 15;36(16):3188-90. doi: 10.1364/OL.36.003188.

Pump-probe spectroscopy on photoinitiators for stimulated-emission-depletion optical lithography.

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  • 1Institut fïr Physikalische Chemie, Karlsruhe Institute of Technology (KIT), D-76128 Karlsruhe, Germany. thomas.wolf@kit.edu

Abstract

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.

© 2011 Optical Society of America

PMID:
21847203
[PubMed]
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