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.
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