Vafapour Zohreh
J Opt Soc Am A Opt Image Sci Vis. 2018 Mar 1;35(3):417-422. doi: 10.1364/JOSAA.35.000417.
Recently reported metamaterial (MM) analogs of electromagnetically induced reflectance (EIR) enable a unique route to endow classical optical structures with aspects of quantum optical systems. This method opens up many fascinating prospects on novel optical components, such as slow light units, highly sensitive sensors, and nonlinear devices. Here we designed and simulated a microwave MM made from aluminum thin film to mimic the EIR system. High reflectance of about 99 percent and also a large group index at the reflectance window of about 243 are demonstrated, which mainly arise from the enhanced coupling between radiative and nonradiative elements. The interaction between the elements of the unit cell, induced directly or indirectly by the incident electromagnetic wave, leads to a reflectance window, resembling the classical analog of EIR. This reflectance window, caused by the coupling of radiative-nonradiative modes, can be continuously tuned in a broad frequency regime. The strong normal phase dispersion in the vicinity of this reflectance window results in the slow light effect. This scheme provides an alternative way to achieve tunable slow light in a broad frequency band and can find important applications in active and reversibly tunable slow light devices.
最近报道的电磁诱导反射（EIR）的超材料（MM）类似物为赋予经典光学结构量子光学系统的特性提供了一条独特途径。该方法为新型光学元件开辟了许多迷人的前景，如慢光单元、高灵敏度传感器和非线性器件。在此，我们设计并模拟了一种由铝薄膜制成的微波MM，以模拟EIR系统。结果表明，在约243的反射窗口处，反射率高达约99%，并且具有较大的群折射率，这主要源于辐射和非辐射元件之间增强的耦合。由入射电磁波直接或间接引起的晶胞单元内各元件之间的相互作用，产生了一个反射窗口，类似于经典的EIR类似物。这种由辐射-非辐射模式耦合引起的反射窗口可以在很宽的频率范围内连续调谐。在该反射窗口附近强烈的正常相位色散导致了慢光效应。该方案为在宽频带内实现可调谐慢光提供了一种替代方法，并且在有源和可逆可调谐慢光器件中具有重要应用。
