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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.

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.

DOI: 10.1364/OL.36.003188
Zitationen: 40
Web of Science
Zitationen: 37
Zugehörige Institution(en) am KIT Institut für Angewandte Physik (APH)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2011
Sprache Englisch
Identifikator ISSN: 0146-9592
KITopen-ID: 1000027143
HGF-Programm 43.14.01 (POF II, LK 01)
Photonics crystals and metamaterials
Erschienen in Optics Letters
Band 36
Heft 16
Seiten 3188 - 3190
Nachgewiesen in Scopus
Web of Science
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