太赫兹辐射
蓝宝石
材料科学
单斜晶系
热液循环
薄膜
光电子学
透射率
退火(玻璃)
二氧化二钒
光学
分析化学(期刊)
纳米技术
结晶学
激光器
晶体结构
复合材料
化学
物理
地质学
地震学
色谱法
作者
Ruike Wang,Hai Wang,Zhi-qiang An,Jingsuo He,Cunlin Zhang,Guoping Pan,Xiang Li
摘要
We investigate the terahertz optical properties of VO2 (M) films synthesized hydrothermally on a c-sapphire substrate by a two-step method. The terahertz transmittance is greater than 70% for the insulating state of monoclinic VO2 films, and the average modulation depth approaches 94% for frequencies of 0.2–2.0 THz. A sample prepared using 450 °C postannealing undergoes a sharp insulator–metal transition around 61 °C at 1.5 THz with a 97% modulation depth. Furthermore, the effects of the postannealing temperature on the structure, morphology, and phase-transition properties of VO2 film/c-sapphire samples are presented. The results show that the hydrothermal synthesis of VO2 polymorphs has potential applications in the terahertz wavelength range.
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