Low-power nonlinear enhanced electromagnetic transmission of a subwavelength metallic aperture
When a dielectric meta-atom is placed into a subwavelength metallic aperture, 20-fold enhanced electromagnetic transmission through the aperture is realized at the meta-atom’s resonant frequency. Additionally, when the incident electromagnetic power increases, thermal energy gathered by the meta-atom, which is converted from electromagnetic losses, can cause the meta-atom’s temperature to increase. Because of the high temperature coefficient of the meta-atom’s resonant frequency, this temperature increase causes a blueshift in the transmission peak. Therefore, this frequency-dependent enhanced electromagnetic transmission even produces a nonlinear effect at low incident powers. Over an incident power range from 0 to 20 dBm, measured and simulated spectra near the meta-atom’s resonant frequency show distinctly nonlinear transmission.
基金项目：National Natural Science Foundation of China (NSFC)10.13039/501100001809 (61675103, 51862027, 51532004); Natural Science Foundation of Inner Mongolia10.13039/501100004763 (2018JQ03); State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University (THU)10.13039/501100004147 (KF201702).
Saiyu Liu：Department of Applied Physics, Inner Mongolia University of Science & Technology, Baotou 014010, China
Ke Bi：State Key Laboratory of Information Photonics and Optical Communications & School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
Ming Lei：State Key Laboratory of Information Photonics and Optical Communications & School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
Ji Zhou：State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Yunsheng Guo, Saiyu Liu, Ke Bi, Ming Lei, and Ji Zhou, "Low-power nonlinear enhanced electromagnetic transmission of a subwavelength metallic aperture," Photonics Research 6(12), 1102-1106 (2018)