1 September 2017 Modulators for MWIR detectors with liquid crystals
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Proceedings Volume 10455, 12th Conference on Integrated Optics: Sensors, Sensing Structures, and Methods; 1045506 (2017) https://doi.org/10.1117/12.2280700
Event: Twelfth Integrated Optics – Sensors, Sensing Structures and Methods Conference, 2017, Szczyrk-Gliwice, Poland
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.
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U. Chodorow, U. Chodorow, A. Kowalewski, A. Kowalewski, J. Herman, J. Herman, R. Mazur, R. Mazur, P. Morawiak, P. Morawiak, W. Piecek, W. Piecek, P. Kula, P. Kula, W. Gawron, W. Gawron, P. Martyniuk, P. Martyniuk, } "Modulators for MWIR detectors with liquid crystals", Proc. SPIE 10455, 12th Conference on Integrated Optics: Sensors, Sensing Structures, and Methods, 1045506 (1 September 2017); doi: 10.1117/12.2280700; https://doi.org/10.1117/12.2280700
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