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Proceedings Paper

Modulators for MWIR detectors with liquid crystals
Author(s): U. Chodorow; A. Kowalewski; J. Herman; R. Mazur; P. Morawiak; W. Piecek; P. Kula; W. Gawron; P. Martyniuk
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Paper Abstract

In this paper a two liquid crystal (LC) modulators for mid-wave infrared radiation (MWIR) are presented. A two electrooptical effects (EOE) in liquid crystalline structures have been utilized for MWIR modulation: electric field induced cholesteric - nematic (Ch-N*) phase transition (ChN mode) and switching of the twisted-nematic (TN) structure (TN mode). At the Ch-N* mode an intensity modulation depth was of order of 15% but there wasn’t a dark state. In case of the modulation induced at TN mode was near full. These modulators are quite slow, switching times are order of a few hundreds of milliseconds for Ch-N* mode electrooptical effect and dozens of minutes in case of TN mode.

Paper Details

Date Published: 1 September 2017
PDF: 5 pages
Proc. SPIE 10455, 12th Conference on Integrated Optics: Sensors, Sensing Structures, and Methods, 1045506 (1 September 2017); doi: 10.1117/12.2280700
Show Author Affiliations
U. Chodorow, Military Univ. of Technology (Poland)
A. Kowalewski, Military Univ. of Technology (Poland)
J. Herman, Military Univ. of Technology (Poland)
R. Mazur, Military Univ. of Technology (Poland)
P. Morawiak, Military Univ. of Technology (Poland)
W. Piecek, Military Univ. of Technology (Poland)
P. Kula, Military Univ. of Technology (Poland)
W. Gawron, Vigo Systems S.A. (Poland)
P. Martyniuk, Military Univ. of Technology (Poland)


Published in SPIE Proceedings Vol. 10455:
12th Conference on Integrated Optics: Sensors, Sensing Structures, and Methods
Przemyslaw Struk; Tadeusz Pustelny, Editor(s)

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