论文标题
部分可观测时空混沌系统的无模型预测
Multi Spectral Switchable Infra-Red Reflectance Resonances in Highly Subwavelength Partially Oxidized Vanadium Thin Films
论文作者
论文摘要
相变材料有望实现可切换光学元件。在这项工作中，我们显示了高度次次波长部分氧化钒薄膜的近红外和长波红外波长的反射率共振。这些部分氧化的膜由使用拉曼光谱和四探针测量的多层二氧化钒和钒的多层组成。由于二氧化钒是一种相过渡材料，显示在68 C下绝缘体向金属相变，因此观察到的红外谐振可以用温度转换为高反射态。这些共振的波长是氧化持续时间的函数被动调节的。在近红外波长的红移中获得的反射率共振从1.78 um到2.68 UM，氧化持续时间增加，而长波长红外谐振蓝移则从12.68 um到9.96 um。为了找到反射率共振的起源，我们使用转移矩阵方法对反射光谱进行建模作为氧化持续时间的函数。提出的模型很好地捕获了双重反射率的共鸣。这些具有易于制造的无光刻多层结构的被动波长 - 可转换和可切换的共振对多光谱应用将有用，例如伪装，光谱选择性微量光计和热管理。
Phase transition materials are promising for realization of switchable optics. In this work, we show reflectance resonances in the near-infrared and long-wave infrared wavelengths in highly subwavelength partially oxidized Vanadium thin films. These partially oxidized films consist of a multilayer of Vanadium dioxide and Vanadium as shown using Raman spectroscopy and four-probe measurements. As Vanadium dioxide is a phase transition material that shows insulator to metal phase transition at 68 C, the observed infra-red resonances can be switched with temperature into a high-reflectance state. The wavelength of these resonances are passively tunable as a function of the oxidation duration. The obtained reflectance resonance at near-infrared wavelength red shifts from 1.78 um to 2.68 um with increasing oxidation duration while the long-wavelength infrared resonance blue shifts from 12.68 um to 9.96 um. To find the origin of the reflectance resonances, we model the reflectance spectra as a function of the oxidation duration using the transfer matrix method. The presented model captures the dual reflectance resonances reasonably well. These passive wavelength-tunable and switchable resonances with easy to fabricate lithography-free multilayer structure will be useful for multispectral applications such as camouflage, spectral selective microbolometer, and thermal management.
