In recent years, terahertz metamaterials have attracted extensive attention because of their high sensitivity toelectromagnetic waves in biosensing application. In order to obtain high-quality factor resonance, we designed andfabricated single split-ring structures with the radius of 25.5 μm. In the experiment, we measured the terahertztransmission spectra when the angle between the open gap direction and the incident wave horizontal polarization is setto be 0, 30, 45, 60 and 90 degrees, respectively, and compared the effects of different angles on the transmissioncharacteristics. With the increase of the rotation angle, the frequency of sharpest resonance dip in the terahertztransmission spectra has a remarkable blue-shift. Furthermore, we further simulated the polarization conversioncharacteristics of the single splitting rings with different rotation angles. It is found that there is no polarizationconversion effect when the sample is placed at 0 and 90 degrees. When the sample is rotated by 30 degrees, 45 degreesand 60 degrees, polarization conversion is observed, with the highest conversion efficiency at 45 degrees. Our obtainedresults indicate that the terahertz metamaterials have great application prospects in biosensors.
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