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Proceedings Paper

Optical properties, bistability, and nonlinearity of evaporated ternary II-VI semiconductor thin films
Author(s): Hans Joachim Eichler; Andreas Haase; Andreas Kummrow; Andreas G.W. Wappelt; Kestutis Jarasiunas; E. Gaubas; J. Cesnulevicius; V. Gudelis; A. Ruksnaitis
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Paper Abstract

Ternary II-VI semiconductors, like CdSxSe1-x or ZnxCd1-xS, were prepared by thermal evaporation of binary semiconductors from a double source. The influence of substrate temperature during thin film deposition and of thermal annealing in argon atmosphere on absorption edge steepness is studied. A high absorption edge steepness is advantageous to achieve large resonant optical nonlinearities, like absorption bistability and electronic nonlinearities. The position of the absorption edge can be tuned by choosing a proper film composition. Thermally induced optical bistability is demonstrated. Electronic nonlinearities are investigated in ns- and ps-pump-probe experiments. Fast bleaching with < 60 ps relaxation time is observed at the absorption edge. The maximum bleaching coefficient for CdS0.69Se0.31 films is 1.4 cm/kW at (lambda) equals 587 nm for pumping with (lambda) equals 377 nm. Annealing the films showed no effect on the relaxation time, but the bleaching coefficient was increased by a factor of five.

Paper Details

Date Published: 4 March 1993
PDF: 9 pages
Proc. SPIE 1782, Thin Films for Optical Systems, (4 March 1993); doi: 10.1117/12.141008
Show Author Affiliations
Hans Joachim Eichler, Technische Univ. Berlin (Germany)
Andreas Haase, Technische Univ. Berlin (Germany)
Andreas Kummrow, Technische Univ. Berlin (Germany)
Andreas G.W. Wappelt, Technische Univ. Berlin (Germany)
Kestutis Jarasiunas, Vilnius Univ. (Lithuania)
E. Gaubas, Vilnius Univ. (Lithuania)
J. Cesnulevicius, Vilnius Univ. (Lithuania)
V. Gudelis, Vilnius Univ. (Lithuania)
A. Ruksnaitis, Vilnius Univ. (Lithuania)

Published in SPIE Proceedings Vol. 1782:
Thin Films for Optical Systems
Karl H. Guenther, Editor(s)

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