太赫兹磁光超表面非互易传输和隔离器件的研究

项目名称： 太赫兹磁光超表面非互易传输和隔离器件的研究

项目编号： No.61505088

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 范飞

作者单位： 南开大学

项目金额： 21万元

中文摘要： 高性能太赫兹（THz）隔离器的研制，可以高效地解决THz应用系统中存在的反射回波、辐射源保护、阻抗匹配、去耦降噪等问题，对提高THz系统信噪比和稳定性具有重要意义。本项目针对目前THz非互易单向传输及其器件隔离度低、插入损耗大等关键问题，提出了磁光超表面THz隔离器的研究方案。该方案将THz磁光材料引入到新型电磁人工微结构中，形成非对称磁光超表面，利用超表面结构增强磁光材料的磁光效应，有效地打破器件的时间反演对称性，以实现大幅面、高隔离度、低插入损耗的可调谐THz磁光超表面隔离器。本课题将着重研究THz磁光超表面非互易传输和主动调控的物理机理，以及隔离器的阻抗匹配原理和设计方法，设计、制备和测试InSb非对称超表面和填充磁流体的金属-磁光超表面两种结构的THz隔离器，实现隔离度大于40dB，插入损耗小于0.91dB的高性能THz单向传输。

中文关键词： 太赫兹技术；电磁超表面；隔离器；非互易传输；磁光器件

英文摘要： The development of high performance terahertz (THz) isolator can effectively solve problems of echo eliminating, source protection, impedance matching, decoupling and noise reduction in THz application systems, which has an important significance to improve signal to noise ratio and stability for THz systems. This project is aimed to the basic physics and related technical issues in THz nonreciprocal transmission and devices. To solve low isolation and high insertion loss in present THz isolators, we put forward a novel scheme based on magneto-optical metasurface. THz magneto-optical materials are introduced into electromagnetic artificial microstructure forming asymmetric magneto-optical metasurface. This structure can enhance magnetic optical effect of magneto-optical medium, and effectively break the time reversal symmetry of system to realize the high isolation nonreciprocal transmission. This project will specially focus on the physical mechanism of nonreciprocal transmission and active control of THz magneto-optical metasurface, and the principle of impedance matching for THz isolator. We will design, fabricate and measure two different THz isolators based on InSb asymmetric metasurface and ferrofluid filled metal-magneto metasurface with an isolation of more than 40dB and an insertion loss of less than 0.91dB.

英文关键词： Teraherz technology;Metasurface;Isolator;Nonreciprocal transmission;Magneto-optical device