Polarization Conversion Metasurface with Reconfigurable Performance

Achieving polarization conversion of electromagnetic (EM) waves with adjustability is essential for practical applications. Traditional reconfigurable metasurfaces are typically based on electric circuit which always require complicated biasing circuit. Here, we proposed a scheme that is capable of polarization conversion with shifted operating frequencies by adjusting the angle ß of the origami mechanically. To verify the feasibility of our design, we have designed an asymmetric meta-atom with a circular ring on the left and a square ring on the right, which can achieve dual-band polarization conversion. Numerical results show that dual polarization-conversion bands can be shifted from 4.2 and 6.3 GHz at ß=100 to 4.8 and 7.7 GHz at ß=800. By tuning ß within 10°~80°, the operation frequencies can be shifted continuously between above frequency interval. The maximum polarization conversion efficiency is more than 90% in both bands and occurs when ß=45°. When ß=100, the conversion efficiency reaches 9% and 5%. When ß=100, the conversion efficiency reaches 5% and 40%. Regulation range can reach more than 13%. Our mechanical tuning concept is flexible, easy to control and free of complicated biasing circuit, and thus it has potential applications in real-world.