
Proceedings Paper
Liquid crystals for optical readout IR imagingFormat | Member Price | Non-Member Price |
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Paper Abstract
It has long been proven that pyro-optical properties can be used to develop high performance IR detectors without
making use of a microelectronic readout circuit. In this application, the sensing materials should have high pyro-optic
coefficient, or the refractive index of the materials should have strong dependence on temperature. Polymers showed
higher pyro-optic coefficient compared with that of most inorganic materials. Among the polymers, liquid crystals (LCs)
attracted more interests for their stronger temperature dependent optical characteristics.
In this study, 5CB and 3HHV LCs were selected as examples to investigate their pyro-optic properties for the
development of optical readout IR imaging devices.
Refractive indices of the 5CB LC for both ordinary and extrodinary light were characterized within the phase transition
temperature range. It was found that the no changed slightly with the variation of temperature, while the ne changed
dramatically with the change of temperature. For 5CB, when the temperature increased from 22°C to 34 °C, ne decreased
from 1.75 to 1.64 for wavelength of 632.8nm. Results for 3HHV were also reported and analyzed.
Another interesting property of the 5CB was that it showed obvious IR absorption in the wavelength range between 3
and 5 μm, which made them more promising for the application as IR sensing materials.
Paper Details
Date Published: 26 August 2010
PDF: 6 pages
Proc. SPIE 7780, Detectors and Imaging Devices: Infrared, Focal Plane, Single Photon, 77800M (26 August 2010); doi: 10.1117/12.858609
Published in SPIE Proceedings Vol. 7780:
Detectors and Imaging Devices: Infrared, Focal Plane, Single Photon
Eustace L. Dereniak; Randolph E. Longshore; Manijeh Razeghi; John P. Hartke; Ashok K. Sood; Paul D. LeVan, Editor(s)
PDF: 6 pages
Proc. SPIE 7780, Detectors and Imaging Devices: Infrared, Focal Plane, Single Photon, 77800M (26 August 2010); doi: 10.1117/12.858609
Show Author Affiliations
Weiguo Liu, Xi'an Technological Univ. (China)
Xiaoling Niu, Xi'an Technological Univ. (China)
Shaanxi Normal Univ. (China)
Shaanxi Normal Univ. (China)
Published in SPIE Proceedings Vol. 7780:
Detectors and Imaging Devices: Infrared, Focal Plane, Single Photon
Eustace L. Dereniak; Randolph E. Longshore; Manijeh Razeghi; John P. Hartke; Ashok K. Sood; Paul D. LeVan, Editor(s)
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