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Proceedings Paper

Refractive index controllable coatings for optical detectors
Author(s): Jun Shen; Sheng-zhao Wang; Xiao-dong Wang; Yuan Liu; Xiao-guang Li
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Paper Abstract

SiO2 and SiO2-TiO2 composite nanoporous coating was successfully prepared via sol-gel method in this paper. By the control of the different porosity of SiO2 coating and content of TiO2 in the mixture, the refractive index of the coatings can be adjusted from 1.17 up to 2.20 continuously, which can be well matched with most of the optic materials used in versatile detectors. Meanwhile, the thickness of the crack free SiO2 and SiO2-TiO2 nano-composite coatings can be easily controlled by employing different experimental parameters. As a typical example, a coating with refractive index of 1.82 was prepared for a GaAs based IR detectors. In 2.5 - 6.0μm waveband, the maximum transmittance of GaAs substrate is increased from 56% for uncoated sample to 94% for coated sample, which agrees with the theoretical results quite well.

Paper Details

Date Published: 24 August 2009
PDF: 8 pages
Proc. SPIE 7381, International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors, 73812C (24 August 2009); doi: 10.1117/12.833909
Show Author Affiliations
Jun Shen, Tongji Univ. (China)
Sheng-zhao Wang, Tongji Univ. (China)
Xiao-dong Wang, Tongji Univ. (China)
Yuan Liu, Tongji Univ. (China)
Xiao-guang Li, Tongji Univ. (China)


Published in SPIE Proceedings Vol. 7381:
International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors
Xu-yuan Chen; Yue-lin Wang; Zhi-ping Zhou; Qing-kang Wang, Editor(s)

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