Optical Properties of Al-Doped ZnO Films in the Infrared Region and Their Absorption Applications

Nanoscale Research Letters
Hua ZhengLiang-Yao Chen

Abstract

The optical properties of aluminum-doped zinc oxide (AZO) thin films were calculated rapidly and accurately by point-by-point analysis from spectroscopic ellipsometry (SE) data. It was demonstrated that there were two different physical mechanisms, i.e., the interfacial effect and crystallinity, for the thickness-dependent permittivity in the visible and infrared regions. In addition, there was a blue shift for the effective plasma frequency of AZO when the thickness increased, and the effective plasma frequency did not exist for AZO ultrathin films (< 25 nm) in the infrared region, which demonstrated that AZO ultrathin films could not be used as a negative index metamaterial. Based on detailed permittivity research, we designed a near-perfect absorber at 2-5 μm by etching AZO-ZnO alternative layers. The alternative layers matched the phase of reflected light, and the void cylinder arrays extended the high absorption range. Moreover, the AZO absorber demonstrated feasibility and applicability on different substrates.

References

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Jan 12, 2016·Physical Chemistry Chemical Physics : PCCP·Ji-Ping XuLiang-Yao Chen
Sep 19, 2016·Nanoscale Research Letters·Chen-Hui ZhaiLiang-Yao Chen
Apr 27, 2017·Physical Chemistry Chemical Physics : PCCP·Da-Hai LiLiang-Yao Chen
Mar 7, 2016·Optics Express·Jia-Yu LinPo-Tsung Lee

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Citations

Mar 11, 2021·Applied Optics·Ashish Kumar ChowdharyDebabrata Sikdar
Apr 20, 2021·Nanotechnology·Debadrita PariaAmbarish Ghosh

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Methods Mentioned

BETA
infrared spectroscopy

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