Phys.org June 23, 2021
Superscattering effects, such as stopping wave propagation in an air channel, have not been verified from illusion devices physically because of the challenge of metamaterial design, fabrication, and material loss. Researchers in China have implemented a big metamaterial superscatterer, and experimentally demonstrated its superscattering effect at microwave frequencies by field-mapping technology. They confirmed that superscattering is originated from the excitation of surface plasmons. They experimentally showed that an invisible gateway integrated with superscatterer could stop electromagnetic waves in an air channel with a width much larger than the cutoff width of the corresponding rectangular waveguide. The results provide direct observation of superscattering effect of double negative metamaterials and invisible gateway for electromagnetic waves. According to the researchers it is an ideal platform for future designs of other illusion devices…read more. TECHNICAL ARTICLE 1 , 2 , Open Access 3
The invisible gateway realized by the researchers’ metamaterial superscatterer. Right: stopping coming wave into the gateway. Credit: Ye et al.