Total space focus adjustable super-structure lens and design method thereof

Abstract

The invention discloses a total-space focus-adjustable super-structure lens and a design method thereof, the total-space focus-adjustable super-structure lens comprises a first super-structure surface, a second super-structure surface and a third super-structure surface, and emergent wave phases corresponding to nano antennas of the first super-structure surface meet a formula: P1 =-a ((x1 + d) 2 + y12), the emergent wave phase corresponding to each nano antenna on the second metasurface meets the formula: P2 = a ((x2 + d) 2 + y22) (a (x22 + y22)) phi 1, the emergent wave phase corresponding to each nano antenna on the third metasurface meets the formula: P3 =-(a (x32 + y32)) phi 2, a and d are constants, x1 and y1 are first plane coordinates corresponding to each nano antenna on the first metasurface, x2 and y 2 are second plane coordinates corresponding to the nano antennas on the second metasurface, x3 and y3 are third plane coordinates corresponding to the nano antennas on the third metasurface, phi < 1 > and phi < 2 > are angles under a cylindrical coordinate system, phi < 1 > = tan-1 (y2 / x2), and phi < 2 > = tan-1 (y3 / x3). The planar structure of the super-structure lens avoids spherical aberration and chromatic aberration, the numerical aperture is increased, the super-structure lens is small in size and beneficial to integration, and free adjustment of the full-space focus can be achieved.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to an all-space focus adjustable metalens and a design method thereof. Background technique [0002] Focus-tunable optical lenses are widely used in multi-focal plane microscopy and bifocal objectives due to their ability to achieve multi-focus adjustment. However, the existing focus-tunable optical lenses are based on microlenses. Further narrowing, on the other hand, the larger the focus adjustable range, the larger the space occupied by the mechanical movement of the microlens, resulting in a large volume of the existing focus adjustable optical lens. In addition, microlenses based on diffractive optical elements are limited in a narrow band, resulting in a small numerical aperture of existing focus-tunable optical lenses. [0003] Therefore, the prior art needs to be further improved. Contents of the invention [0004] In view of the above-mentioned deficiencies in the prio...

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Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an all-space focus adjustable metalens and its design method to solve the problems of large volume and small numerical aperture of existing focus adjustable optical lenses

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