Low-power nonlinear enhanced electromagnetic transmission of a subwavelength metallic aperture
PHOTONICS RESEARCH(2018)
Abstract
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. (C) 2018 Chinese Laser Press
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Key words
subwavelength metallic aperture,electromagnetic transmission,low-power
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