Concentric annular type topological super lens, method for acquiring structure thereof and manufacturing method

Abstract

The invention discloses a concentric annular type topological super-lens, a method for acquiring a structure thereof and a manufacturing method. The method for acquiring the structure comprises the following steps: taking the maximation of optical wave field energy density on a focal position corresponding to a preset numerical aperture as a target; and deducing a super lens main body which takes circular polarized wave or radiation polarized wave as stimulation, is arranged on an appointed base and has rotation symmetry; establishing a lossless titanium dioxide interpolation function in a symmetric plane of the super lens main body; solving a helmholtz equation of a transverse magnetic wave which takes the maximation of the optical wave field energy density on the focus as the target, thereby acquiring a surface structure of the convergent super lens main body; and rotating the surface structure of the convergent super lens main body around a symmetry axis, thereby acquiring the main body of the concentric annular type topological super-lens. By adopting a reverse deducing manner, the structure of the super lens main body is deduced, so that the numerical aperture of the super lens can be freely appointed according to the requirement, the super lens is small in volume, the process is simple, the manufacturing cost is low and the super lens is easily integrated and arrayed.

Description

technical field [0001] The invention relates to the field of micro-nano imaging technology, in particular to a concentric annular topological superlens and its structure acquisition method and manufacturing method. Background technique [0002] Since the metalens can break through the traditional optical diffraction limit and image or magnify sub-wavelength objects, with the further development of metalens technology, it can already magnify sub-wavelength objects, and its application field has expanded to biological DNA molecules. imaging and other fields. [0003] Therefore, sub-wavelength resolution imaging is a hot field in the development of imaging optics and nano-optics, and it is an important way to realize a new generation of optical microscopy and optical imaging technology. Subwavelength resolution imaging requires high numerical aperture lenses, but such lenses are bulky and expensive. After the concept of metalenses based on metasurfaces was proposed, it has be...

AI Technical Summary

Problems solved by technology

However, the nanostructures on this type of metalens have a large aspect ratio, a small pitch, and a huge number (1×10 7 pieces / mm2), which brings great difficulty to the design, manufacture and general application of this kind of metalens

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