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

Jiang Qiu; Juan Xu; Fei Fan

doi:10.1117/1.OE.58.6.067102

6 June 2019 Terahertz wave asymmetric transmission based on double-layer subwavelength dielectric grating

Jiang Qiu, Juan Xu, Fei Fan

Author Affiliations +

Optical Engineering, Vol. 58, Issue 6, 067102 (June 2019). https://doi.org/10.1117/1.OE.58.6.067102

Abstract

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.

Citation Download Citation

Jiang Qiu, Juan Xu, and Fei Fan "Terahertz wave asymmetric transmission based on double-layer subwavelength dielectric grating," Optical Engineering 58(6), 067102 (6 June 2019). https://doi.org/10.1117/1.OE.58.6.067102

Received: 22 March 2019; Accepted: 17 May 2019; Published: 6 June 2019

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