Phys.org May 14, 2021
Terahertz flat optics is a design concept for replacing conventional three-dimensional bulky optical components with two-dimensional ultra-thin optical components. However, high refractive index materials suitable for flat optics are frequently subject to high Fresnel reflections due to the cumbersome control of the relative permeability it requires. Researchers in Japan fabricated metasurface consisting of 80,036 pairs of cut metal wires on both the front and back of a 5 μm-thick polyimide film with a super-fine ink-jet printer using silver paste ink. They have experimentally shown that the metasurface is reflectionless, has a high refractive index, extremely low reflectance of high relative permittivity and the high relative permeability. The findings demonstrate that weak conductors as well as good conductors can be used in the design of reflectionless metasurfaces with a high refractive index in the terahertz waveband. The metasurface offers an accessible platform for terahertz flat optics in 6G wireless communications and imaging…read more. Open Access TECHNICAL ARTICLEÂ
…highly refractive index metasurfaces that may eventually be used in practical applications to send, receive, and manipulate light and radio waves in the terahertz waveband (THz). Credit: Takehito Suzuki, Tokyo University of Agriculture and Technology.