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Metamaterial nonlinear and polarization-dependent bi-frequency THz switch
Journal of the Optical Society of America B ( IF 1.9 ) Pub Date : 2020-02-12 , DOI: 10.1364/josab.380364
Nahid Sharifi , Nosrat Granpayeh

In this work, we propose a novel metamaterial structure with two concentric split-ring resonators. The splits are filled by photoconductive Si. Illuminating the structure using an oblique optical pump with a wavelength of 800 nm, in addition to the normal THz signal wave, excites the structure by varying the Si conductivity. Also, by changing the direction of the incident TE wave by 90°, the transmission frequency is changed. Therefore, the structure operates as a switch at two different windows using two different methods. The response time of the photoconductive switch is less than 3 ps. The substrate was replaced by a more cost-effective and flexible material, polyimide, to achieve even more exciting results in broadening the switching windows. Also, the response time of this switch is less than 1 ps. Finally, for verification of the simulation results, a circuit model of the photoconductive switch is proposed, and the results comply very well with the simulation results. The proposed switch can be used in fast optical systems and networks.

中文翻译:

超材料非线性和极化相关双频太赫兹开关

在这项工作中,我们提出了一种具有两个同心开口环谐振器的新型超材料结构。缝隙由光导硅填充。除了正常的THz信号波之外,还使用波长为800 nm的倾斜光泵来照亮结构,通过改变Si的电导率来激发结构。另外,通过将入射TE波的方向改变90°,可以改变发送频率。因此,该结构使用两种不同的方法在两个不同的窗口处充当开关。光电导开关的响应时间小于3 ps。基板被更具成本效益和柔性的材料聚酰亚胺所取代,从而在扩大开关窗口方面获得了更加令人兴奋的结果。同样,此开关的响应时间小于1 ps。最后,为了验证仿真结果,提出了光电导开关的电路模型,其结果与仿真结果非常吻合。拟议的交换机可用于快速光学系统和网络。
更新日期:2020-03-02
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