论文标题
可使用无光刻相位变化材料超薄膜的可编程反射幅度的可重新配置的平面光学元件
Reconfigurable Flat Optics with Programmable Reflection Amplitude Using Lithography-Free Phase-Change Materials Ultra Thin Films
论文作者
论文摘要
我们在实验上证明了从简单的不公平的分层材料超薄膜的层次堆栈中显示出非常大的动态光学反射调制。具体而言，我们从理论上和实验上证明，在金属镜上正确设计的深层次波长gesbte（GST）膜可通过简单地切换相结晶材料的晶体状态，从而从非常强的反射（r> 80％）到完美的吸收（> 99,97％），从而产生近红外的光的动态调制。虽然调制的幅度可以导致高达10^6的光学对比度，但我们也可以积极地“写入”极值之间的中间反射水平，对应于GST层的部分结晶。我们进一步探索了几种分层系统设计，并提供指南，以量身定制波长效率范围，操作角度和结晶程度，从而导致完美吸收。
We experimentally demonstrate a very large dynamic optical reflection modulation from a simple unpatterned layered stack of phase-change materials ultrathin films. Specifically, we theoretically and experimentally demonstrate that properly designed deeply subwavelength GeSbTe (GST) films on a metallic mirror produce a dynamic modulation of light in the near-infrared from very strong reflection (R>80%) to perfect absorption (A > 99,97%) by simply switching the crystalline state of the phase-change material. While the amplitude of modulation can lead to an optical contrast up to 10^6, we can also actively "write" intermediate levels of reflection in between extreme values, corresponding to partial crystallization of the GST layer. We further explore several layered system designs and provide guidelines to tailor the wavelength efficiency range, the angle of operation and the degree of crystallization leading to perfect absorption.
