Optical device

Abstract

An optical device having a first region and a second region surrounding the first region is provided. The optical device includes a substrate. The optical device also includes a first meta-structure disposed on the substrate and having a plurality of first peripheral pillars in the second region. The optical device further includes a second meta-structure disposed on the substrate and having a plurality of second peripheral pillars corresponding to the plurality of first peripheral pillars. Each of the second peripheral pillars has a first shifting distance with respect to a corresponding first peripheral pillar in the radiation direction from the center of the optical device to the edge of the optical device.

Description

technical field [0001] Embodiments of the present disclosure relate to an optical device, in particular to an optical device comprising at least two meta-structures. Background technique [0002] In general, conventional optical lenses such as color filters, condenser lenses, and beamsplitters must be combined to provide a specific function. In addition, to eliminate the chromatic effect (which degrades its performance in panchromatic imaging applications), designers must integrate multiple lenses with opposite dispersion. These traditional optical lenses can make the end equipment in which they are used bulky. [0003] In recent years, thin lenses with focusing effects, called meta-lenses, have been developed. A metalens has a nanostructure that uses high refractive index materials to change the optical phase. Compared with traditional optical lenses, this structure greatly improves the volume and weight. [0004] However, existing metalenses are not satisfactory in eve...

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Problems solved by technology

[0004] However, existing metalenses are not satisfactory in every respect

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