Tuesday, June 18, 2019

Abstract-Terahertz wave asymmetric transmission based on double-layer subwavelength dielectric grating

Jiang Qiu,  Juan Xu,  Fei Fan

https://www.spiedigitallibrary.org/journals/Optical-Engineering/volume-58/issue-6/067102/Terahertz-wave-asymmetric-transmission-based-on-double-layer-subwavelength-dielectric/10.1117/1.OE.58.6.067102.short?SSO=1


A double-layer subwavelength dielectric grating has been designed, fabricated, and characterized for terahertz (THz) wave asymmetric transmission. The subwavelength grating resonance effect and the first-order diffraction effect of the two different grating structures lead to the different light paths of the forward and backward waves, and thus the one-way transmission can be realized. The transmission and resonance properties of this grating with different polarization and propagation directions have been demonstrated experimentally and theoretically, which show that this is a nonmagnetic one-way transmission device with an extinction ratio of over 15 dB and insertion loss of lower than 5 dB at 1.45 THz. We provide an effective way to nonmagnetic THz asymmetric transmission devices operating at room temperature without rotating or converting the polarization state of incident wave.

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2019/$25.00 © 2019 SPIE

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