Abstract
A terahertz broadband polarization converter based on the metasurface of a double-split ring resonator is proposed. The structural parameters of this device have been optimized in numerical simulations. The results show that in the frequency range from 0.49 to 1.88 THz (bandwidth of 1.39 THz) the proposed device rotates incident linearly polarized waves through 90°. The polarization conversion rate is more than 80%. The coefficient of reflection for cross polarization is greater than 90% with a transmission loss of 1 dB. The surface current distribution of this structure was simulated and analyzed at three frequencies that give high conversion rates of the polarization. The mechanism underlying this high conversion rate is presented, and the dependence of the conversion rate on incident angle and polarization angle is stimulated and analyzed. The results show that the conversion performance of this device is good for incidence angles ranging from 0 to 30° and polarization angles ranging from − 10 to 10°. Compared with previous designs, the polarization converter has a simple structure and a broad operational bandwidth. It has potential applications in the field of terahertz polarization modulation.
Highlights
Terahertz technology has important applications in areas such as spectral analysis, [1, 2] imaging, [3, 4] safety inspection, [5, 6] and communication [7]
Most of the molecular vibration frequencies are in the terahertz band, so terahertz spectroscopy can be used as an important means of material recognition such as gunpowder, drug and so on
The research on devices operating with terahertz waves, such as polarization converters, [8] filters, [9] and lenses, [10] is gradually garnering a lot of attention
Summary
Terahertz technology has important applications in areas such as spectral analysis, [1, 2] imaging, [3, 4] safety inspection, [5, 6] and communication [7]. Because of the specific characteristics of crystals, polarization devices have inherent drawbacks such as low conversion rates and narrow band widths. A terahertz polarization converter based on the hyper-surface of a doubleopen resonant ring is described that achieves an efficient polarization conversion over a wide band in the terahertz region of frequencies. When both incidence and polarization angles change in a certain frequency range, the converter maintains a high polarization transformation that offers a certain value in applications
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