Meta lens and optical apparatus including the same

An imaging lens comprising a plurality of lens elements, the imaging lens comprising:

• a plurality of refractive lenses;
• a first meta lens provided in a position of a light path before a medium position along an arrangement order of the plurality of lens elements, the first meta lens comprising a first metasurface comprising a plurality of nanostructures, wherein the arrangement order is in a direction toward an image sensor corresponding to the imaging lens;
• a second meta lens, provided at a position of the light path after the medium position along the arrangement order of the plurality of lens elements,
• wherein the second meta lens comprises:
• a first lens surface;
• and
• a second lens surface opposite to the first lens surface,
• wherein at least one of the first lens surface and the second lens surface is a metasurface comprising a plurality of nanostructures having a sub-wavelength dimension,
• wherein the first lens surface has a first deflection property based on positions of incident light in at least some regions of the first lens surface and the second lens surface has a second deflection property based on positions of incident light in at least some regions of the second lens surface,
• wherein the first deflection property is different from the second deflection property,
• wherein the second meta lens has an integral structure comprising a substrate with a first surface and a second surface that is opposite to the first surface,
• wherein the second meta lens comprises:
• a second metasurface comprising a plurality of nanostructures arranged in a second shape distribution on the first surface, and
• a third metasurface comprising a plurality of nanostructures arranged in a third shape distribution that is different from the second shape distribution on the second surface, and
• wherein the second metasurface and the third metasurface are further configured such that the second meta lens does not have a refractive power with respect to light in a green wavelength band.

An imaging device comprising:

• an imaging lens comprising a plurality of lens elements;
• and
• an image sensor configured to convert an optical image formed by the imaging lens into an electric signal,
• wherein the imaging lens comprises:
• a plurality of refractive lenses;
• a first meta lens provided in a position of a light path before a medium position along an arrangement order of the plurality of lens elements, the first meta lens comprising a first metasurface comprising a plurality of nanostructures, wherein the arrangement order is in a direction toward the image sensor corresponding to the imaging lens;
• a second meta lens, provided at a position of the light path after the medium position along the arrangement order of the plurality of lens elements,
• wherein the second meta lens comprises:
• a first lens surface;
• and
• a second lens surface opposite to the first lens surface,
• wherein at least one of the first lens surface and the second lens surface is a metasurface comprising a plurality of nanostructures having a sub-wavelength dimension,
• wherein the first lens surface has a first deflection property based on positions of incident light in at least some regions of the first lens surface and the second lens surface has a second deflection property based on positions of incident light in at least some regions of the second lens surface,
• wherein the first deflection property is different from the second deflection property,
• wherein the first meta lens is configured to correct longitudinal chromatic aberrations of the imaging lens, and
• wherein the second meta lens is configured to correct lateral chromatic aberrations of the imaging lens.