Refractive index controllable coatings for optical detectors

Jun Shen; Sheng-zhao Wang; Xiao-dong Wang; Yuan Liu; Xiao-guang Li

doi:10.1117/12.833909

24 August 2009 Refractive index controllable coatings for optical detectors

Jun Shen, Sheng-zhao Wang, Xiao-dong Wang, Yuan Liu, Xiao-guang Li

Proceedings Volume 7381, International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors; 73812C (2009) https://doi.org/10.1117/12.833909
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

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.

Citation Download Citation

Jun Shen, Sheng-zhao Wang, Xiao-dong Wang, Yuan Liu, and Xiao-guang Li "Refractive index controllable coatings for optical detectors", Proc. SPIE 7381, International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors, 73812C (24 August 2009); https://doi.org/10.1117/12.833909

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