Definition: An achromatic lens can be defined as a lens which is made by a combination of two different types of lenses carrying different focal powers in a manner such that the images formed by the ...

Abstract: Metasurfaces have attracted extensive attention due to their excellent capabilities in wavefront manipulation. However, chromatic aberration, which is widely present in phase-modulated ...

Abstract: Inspired by optical metalens, terahertz (THz) metalenses have been developed rapidly in the last decade. Numerous functionalities, such as achromatic focusing and super-resolution imaging, ...

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