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Abstract

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.

Keywords:

electromagnetically induced transparency/
photonic crystal/
metamaterials/
electromagnetic diode

Authors and contacts

Corresponding author:Chen Yong-Qiang,yqchen@usts.edu.cn; Sun Yong,yongsun@tongji.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 91850206, 51607119, 11974261, 11804244), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 18KJA470004), and the Jiangsu Province Key Discipline of China’s 13th Five-Year Plan, China (Grant No. 20168765)

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Vol. 71, Issue 3 - 2022-02-05

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