Optical properties, bistability, and nonlinearity of evaporated ternary II-VI semiconductor thin films

Hans Joachim Eichler; Andreas Haase; Andreas Kummrow; Andreas G.W. Wappelt; Kestutis Jarasiunas; E. Gaubas; J. Cesnulevicius; V. Gudelis; A. Ruksnaitis

doi:10.1117/12.141008

4 March 1993 Optical properties, bistability, and nonlinearity of evaporated ternary II-VI semiconductor thin films

Hans Joachim Eichler, Andreas Haase, Andreas Kummrow, Andreas G.W. Wappelt, Kestutis Jarasiunas, E. Gaubas, J. Cesnulevicius, V. Gudelis, A. Ruksnaitis

Author Affiliations +

Proceedings Volume 1782, Thin Films for Optical Systems; (1993) https://doi.org/10.1117/12.141008
Event: Optical Systems Design '92, 1992, Berlin, Germany

Abstract

Ternary II-VI semiconductors, like CdS_xSe_1-x or Zn_xCd_1-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 CdS_0.69Se_0.31 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.

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Hans Joachim Eichler, Andreas Haase, Andreas Kummrow, Andreas G.W. Wappelt, Kestutis Jarasiunas, E. Gaubas, J. Cesnulevicius, V. Gudelis, and A. Ruksnaitis "Optical properties, bistability, and nonlinearity of evaporated ternary II-VI semiconductor thin films", Proc. SPIE 1782, Thin Films for Optical Systems, (4 March 1993); https://doi.org/10.1117/12.141008

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