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

Wolf, T.J.A.; Fischer, J.; Wegener, M.; Unterreiner, A.N.

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 Abb'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.


Zugehörige Institution(en) am KIT Institut für Angewandte Physik (APH)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2011
Sprache Englisch
Identifikator ISSN: 0146-9592
KITopen ID: 1000027143
HGF-Programm 43.14.01; LK 01
Erschienen in Optics Letters
Band 36
Heft 16
Seiten 3188 - 3190
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