基于非对称微波光子晶体的电磁二极管  

Electromagnetic diode based on asymmetric microwave photonic crystal

作　　者：陈永强 许光远 王军[1] 方宇 吴幸智 丁亚琼[2] 孙勇[3] Chen Yong-Qiang;Xu Guang-Yuan;Wang Jun;Fang Yu;Wu Xing-Zhi;Ding Ya-Qiong;Sun Yong(School of Physical Science and Technology,Suzhou University of Science and Technology,Suzhou 215009,China;Science of College,University of Shanghai for Science and Technology,Shanghai 200093,China;School of Physics Science and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]苏州科技大学物理科学与技术学院,苏州215009 [2]上海理工大学理学院,上海200093 [3]同济大学物理科学与工程学院,上海200092

出　　处：《物理学报》2022年第3期193-198,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:91850206,51607119,11974261,11804244);江苏省高校自然科学研究项目(批准号:18KJA470004);江苏省十三五重点学科(批准号:20168765)资助的课题。

摘　　要：通过引入具有类电磁诱导透明效应的超材料,非对称光子晶体谐振腔的透射特性得到了极大的优化,包括透射峰的品质因子和谐振腔模所对应的电磁场强度.品质因子的提高与非对称场强局域的增强有利于高性能电磁二极管的实现.我们在引入非线性材料的微带波导系统中验证了该方案.实验结果显示,此二极管在1.329 GHz的工作频率下可产生高达19.7 dB的透射对比度,同时输入功率强度仅为7 dBm.此外,我们提出的方案并没有大幅增加器件体积和剧烈降低信号透过率.这些特性的亚波长尺度实现将有益于集成光学回路的小型化.A subwavelength electromagnetic diode scheme in a microwave waveguide system is proposed by using an asymmetric photonic crystal(PC)cavity side-coupled with electromagnetically induced transparency like(EIT-like)metamaterials.It is found that the composite PC-EIT configuration can generate tenfold Q-factor enlargement,accompanied with enhanced nonreciprocal electromagnetic localization simultaneously.Further study of the measured one-way response exhibits excellent electromagnetic diode performance including 19.7 dB transmission contrast and 7 dBm operating power at a working frequency of 1.329 GHz.We emphasize that such high-contrast transmission and low-threshold diode actions are not at costs of greatly increasing volume and drastically reducing transmission.Our findings may benefit the design of compact nonreciprocal devices in the integrated optical nanocircuits.

关 键 词：类电磁诱导透明 光子晶体 超材料 电磁二极管 

分 类 号：TN31[电子电信—物理电子学] O734[理学—晶体学]