Abstract
In this paper, a tunable polarization-dependent terahertz (THz) metamaterial absorber based on liquid crystal (LC) is presented. The measurement results show that absorption peak is at 239.5 GHz for a TE-polarized wave and 306.6 GHz for a TM-polarized wave, without exerting the bias voltage on the LC layer. An increase in bias voltage affects the orientation of LC molecules and causes redshifted resonant frequencies. By adjusting the bias voltage from 0 to 10 V, frequency tunabilities of 4.7% and 4.1% for TE- and TM-polarized waves, respectively, were experimentally demonstrated. Surface current and power loss distribution was analyzed to explain the physical mechanism of the absorber, while the absorption dependence on geometrical parameters and incident angles was also studied in detail. According to the obtained results, the proposed absorber is shown here to be capable of achieving tunable polarization-dependent absorption, and to have potential application in terahertz polarization imaging, terahertz sensing, and polarization multiplexing.
Highlights
In the last decade, terahertz (THz) technology, which has great potential in sensing, imaging, and spectroscopy, has attracted attention [1,2]
The simulations were conducted by using the finite-element frequency-domain method, and the Results and Absorption
The simulations were conducted by using the finite-element method, and[21], the liquid crystal (LC)
Summary
Terahertz (THz) technology, which has great potential in sensing, imaging, and spectroscopy, has attracted attention [1,2]. Since Landy et al presented the concept of a metamaterial absorber (MA) in 2008 [6], MA has attracted great interest due to its enormous advantages such as low cost, small size, and ultrathin thickness. The polarization-dependent absorption is useful and demanded. The polarization information can further increase the depth accuracy of detected images [13] and is of great significance in remote sensing, biomedical imaging, and image sensors. Sakurai et al proposed an L-shaped polarization-dependent MA in the infrared region [14]
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