Modulators for MWIR detectors with liquid crystals

U. Chodorow; A. Kowalewski; J. Herman; R. Mazur; P. Morawiak; W. Piecek; P. Kula; W. Gawron; P. Martyniuk

doi:10.1117/12.2280700

1 September 2017 Modulators for MWIR detectors with liquid crystals

U. Chodorow, A. Kowalewski, J. Herman, R. Mazur, P. Morawiak, W. Piecek, P. Kula, W. Gawron, P. Martyniuk

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.

Citation Download Citation

U. Chodorow, A. Kowalewski, J. Herman, R. Mazur, P. Morawiak, W. Piecek, P. Kula, W. Gawron, and 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); https://doi.org/10.1117/12.2280700

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