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24 August 2009Refractive index controllable coatings for optical detectors
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.
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Jun Shen, Sheng-zhao Wang, Xiao-dong Wang, Yuan Liu, 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);