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Broadband Coverage Optical Sensor with Liquid Crystalline Materials and Pyroelectrics

Published online by Cambridge University Press:  28 March 2011

Jingwen W. Zhang ,
Xiudong Sun  and
Hua Zhao
Jingwen W. Zhang
Affiliation:
Department of Physics, Harbin Institute of Technology, Harbin, China, 150001
Xiudong Sun
Affiliation:
Department of Physics, Harbin Institute of Technology, Harbin, China, 150001
Hua Zhao
Affiliation:
Department of Physics, Harbin Institute of Technology, Harbin, China, 150001
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Abstract

By utilizing a thin layer of supertwisted liquid crystal and potassium sodium strontium barium noibate crystal material with excellent pyroelectric effect, a broadband coverage optical sensing concept was proposed. Coating the pyroelectric substrate with a carbon layer of excellent absorption in the frequency range of interest, the intensity of an incident mid- or far-IR radiation can be converted to a corresponding intensity variation of a reflected near-IR beam via optical modulation of the liquid crystal film. As the result, the spatial intensity distribution of an incident mid- or far-IR radiation can thus be perceived directly by a low-cost semiconductor sensor/ sensor array. With flexible design of wave collecting arrangement, the broadband coverage sensor is suitable for viewing IR-giving objects with a large field-of-view.

Keywords

liquid crystalsensoroptical
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1293: Symposium L – Liquid-Crystal Materials—Beyond Displays , 2011 , mrsf10-1293-l03-04
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

1. Llord, J. M., “Thermal imaging systems”, Plenum Press, New York, 1975 Google Scholar
2. Rogalski, Antoni, “Infrared detectors: status and trends”, Progress in Quantum Electronics, 27 59–210 (2003)Google Scholar
3. Accetta, J. S., and Shumaker, D., “The infrared and electro-optical systems handbook”, Vol. 5:“Passive electro-optical systems,” edited by S. B. Campana, Vol. 7: “Countermeasure systems”, edited by D. Pollock, SPIE Optical Engineering Press, Washington (1993)Google Scholar
4. Cardimona, D. A., Huang, D. H., Le, C. T., Gingrich, H. S., and Serna, M. A., “Advanced IR detector devices and concepts for remote sensing”, proceedings of the SPIE Infrared Spaceborne Remote Sensing XI, San Diego, CA, August 2003, vol. 5152, pp 316–326.Google Scholar
5. Woodlard, D.L., et al. , “Terahertz frequency sensing and imaging: A time of reckoning future applications?”, Proc. IEEE, Vol. 93, No. 10, 1722–1743 (2005)Google Scholar
6. Zmuidzinas, J., and Richards, P. L., “Superconducting detectors and mixers for millimeter and submillimeter astrophysics”, Proc. IEEE, Vol. 92, No. 10, 1597–1616 (2004)Google Scholar
7. Siegel, P.H., “Terahertz technology”, IEEE Transactions on Microwave Theory and Techniques, Vol. 50, No. 3, 910–928 (2002)Google Scholar
8. DeLucia, F.C., “Science and technology in the submillimeter region,” Optics and Photonics News, August 2003 Google Scholar
9. Kawase, Kodo, et al. , “Non-destructive terahertz imaging of illicit drugs using spectral fingerprints”, Optics Express, Vol. 11, No. 20 (2003)Google Scholar
10. Federici, J. et al. , “Terahertz imaging using an interferometric array,” Appl. Phys. Lett., vol. 83, p. 2477 (2003)Google Scholar
11. Whatmore, R. W., “Pyroelectric ceramics and devices for thermal infrared detection and imaging”, Ferroelectrics, 118, 241–259 (1991)Google Scholar
12. Muralt, P., “Micromachined infrared detectors based on pyroelectric thin films”, Rep. Prog. Phys. 64, 1339–1388 (2001)Google Scholar
13. Dawlaty, H. M., Shivaraman, S., Strait, J., George, P., Chandrahekhar, M., Rana, F., Spensor, M. G., Keksler, D., and Chen, Y., “Measurement of the optical absorption spectra of epitaxial graphene from terahertz to visible”. Appl. Phys. Lett. 93, 131905 (2008)Google Scholar
14. Lueder, E., “Liquid crystal displays: Addressing schemes and electro-optical effect”, John Wiley and Sons Ltd, 2001 Google Scholar