论文标题
2 $μ$ M波带达到85％的锡GST-TIN全光反射调制器
TiN-GST-TiN All-Optical Reflection Modulator for 2 $μ$m Waveband Reaching 85% Efficiency
论文作者
论文摘要
在这项研究中，我们提供了一个全光反射调制器，用于2 $ $ m的通信频段，利用纳米吉尔 - 阵列跨质面和一个相变的材料ge $ _2 $ _2 $ _2 $ _2 $ _2 $ _5 $ _5 $（GST）。可以通过使用光刺激来改变GST的相位来操纵结构的反射率。本文显示了有关GST的光学和光热建模技术的详细信息。数值研究表明，根据GST的开关状态，元结构从$ \ sim $ 99％的吸收到与操作光的相互作用非常差，最终具有85 \％调制深度，并且只有0.58 db插入损失，与操作光的相互作用非常差。由于光学响应的明显差异，我们可以证明高消光比为28 dB，值得称赞的FOM为49，到目前为止，在此波长窗口中，最佳调制性能是最佳的调制性能。此外，相变时反射率的实时跟踪表现出高速开关，每周循环的低能量在sub-nj的顺序上。因此，鉴于其整体性能，该设备将成为即将推出2美元的通信技术的光学调节器的范例。
In this study, we present an all-optical reflection modulator for 2$μ$m communication band exploiting a nano-gear-array metasurface and a phase-change-material Ge$_2$Sb$_2$Te$_5$ (GST). The reflectance of the structure can be manipulated by altering the phase of GST by employing optical stimuli. The paper shows details on the optical and opto-thermal modeling techniques of GST. Numerical investigation reveals that the metastructure exhibits a conspicuous changeover from $\sim$ 99% absorption to very poor interaction with the operating light depending on the switching states of the GST, ending up with 85\% modulation depth and only 0.58 dB insertion loss. Due to noticeable differences in optical responses, we can demonstrate a high extinction ratio of 28 dB and a commendable FOM of 49, so far the best modulation performance in this wavelength window. In addition, real-time tracking of the reflectance during phase transition manifests high-speed switching expending low energy per cycle, on the order of sub-nJ. Hence, given its overall performance, the device will be a paradigm for the optical modulators for upcoming 2 $μ$m communication technology.
