Transparent AlON ceramic combined with VO2 thin film for infrared and terahertz smart window |
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Authors: | Bo Peng Qiwu Shi Wanxia Huang Shanshan Wang Jianqi Qi Tiecheng Lu |
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Affiliation: | 1. College of Materials Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, China;2. College of Physical Science and Technology, Sichuan University, Chengdu, Sichuan 610065, China |
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Abstract: | Transparent AlON ceramics are intriguing window materials with excellent mechanical strength and superb optical transparency from the near ultraviolet to the mid-infrared range. However, previous studies focused their investigations in the visible range; therefore, the application of transparent AlON ceramics to tunable windows has yet to be reported. In this work, a VO2 thin film with a characteristic semiconductor-metal phase transition (SMT) was fabricated on a transparent AlON ceramic, which exhibited remarkable tunable switching properties in the infrared and terahertz ranges. The transparent AlON ceramic was prepared by a two-step method, which included carbothermal reduction and pressureless sintering. The resulting ceramic exhibited high transparency of over 70% in the visible-infrared range and a notable THz transmission of 64.5–73.9% at 0.1–1.5?THz. The VO2 thin film was prepared on a transparent AlON ceramic using the sol-gel method and showed excellent optical and electric switching performance. The square resistance variance was close to four orders of magnitude, and an infrared switching ratio of over 40% was obtained. Furthermore, the combined structure showed an efficient THz switching ratio of approximately 70.9%. This study proposes a composite material combined with a transparent ceramic and a phase transition oxide and provides great insights into their application in infrared and terahertz smart windows as well as in switching devices. |
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Keywords: | Transparent AlON ceramic Phase transition IR switching THz switching |
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