What is a microwave metamaterial?
Metamaterials are artificial structures with tailored meta-atoms at subwavelength scales to control electromagnetic waves at will. Working in the range from MHz to 100 GHz, microwave metamaterials are important metamaterials.
What is a Metasurface used for?
Metasurface optical holography It has been used to design planar optical functional elements such as ultrathin metasurface lens, metasurface waveplates, polarization beam splitter and so on. More generally, metasurface is capable of shaping the general and complex wavefront of light through holography techniques.
What is the difference between metamaterial and Metasurface?
Metasurfaces are thin-films composed of individual elements that have initially been developed to overcome the obstacles that metamaterials are confronted with. In contrast, active metasurfaces allow the dynamic control of its optical properties under external stimuli.
What is metamaterial made of?
Metamaterials are composite materials typically composed of arrays of small metallic resonators structured on the microscale or nanoscale (McPhedran, Shadrivov, Kuhlmey, & Kivshar, 2011; Walser, 2003).
How are metamaterials used to focus radio waves?
Device could improve satellite and molecular imaging. The orientation of 4,000 S-shaped units forms a metamaterial lens that focuses radio waves with extreme precision, and very little energy lost. In many respects, metamaterials are supernatural.
How are radio waves focused in a concave lens?
Concave lenses typically radiate radio waves like spokes from a wheel. In this new metamaterial lens, however, radio waves converge, focusing on a single, precise point — a property impossible to replicate in natural materials.
What can metamaterials be used for in the future?
Scientists are investigating metamaterials for their potential to engineer invisibility cloaks — materials that refract light to hide an object in plain sight — and “super lenses,” which focus light beyond the range of optical microscopes to image objects at nanoscale detail.