Location-dependent metasurface with specific structure in terahertz (THz) range is designed and demonstrated, whose unit cell consists of coupled resonators, respectively, on the front and back sides of the polyimide substrate. Two transmission dips in the transmission spectrum are excited by electromagnetic interaction between the front and back resonators. Changeable width of the transmission window can be observed while shifting the front resonator away from its original place. Besides, horizontal and vertical change rule of the structure are all present in this paper. This location-dependent design of metasurface shows potential application on terahertz modulator, filter and sensor.
Several types of multilayer metamaterial devices are studied to achieve cross-polarization conversion as well as subwavelength transmission enhancement. The surface current of three metamaterial layers reveals that the induced current around the apertures of the middle metal layer is the key to the physical mechanism. Furthermore, the simulated results show that the proposed devices have good performance on both the polarization conversion ratio and transmission rate. Lastly, a tunable cross-polarization conversion design is proposed and researched. These results can help to facilitate the development of high-sensitivity sensors and terahertz technology.
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