Liquid medium superlens for aberration elimination

Abstract

The invention discloses a liquid medium superlens for aberration elimination, and belongs to the field of micro-nano optical imaging. The superlens comprises: an upper layer super-surface array, an upper layer superlens quartz substrate coated with an ITO conductive layer on a lower surface, a high-molecular polymer layer, a lower layer superlens quartz substrate coated with the ITO conductive layer on an upper surface, and a lower layer super-surface array, which are arranged from top to bottom in sequence; and a low dielectric constant liquid medium is attached to the high-molecular polymer layer, and the space between the high-molecular polymer layer and the upper layer superlens quartz substrate is filled with the low dielectric constant liquid medium. According to the liquid medium superlens disclosed by the invention, before the upper layer super-surface array adjusts the incident light wave, the gap between two liquid media is filled to form a spherical wave needed for focusing, and then the lower layer super-surface array eliminates the influence of an interference wave and outputs transmission light that can be focused. The wavefront phase of a transmitted wave is finally controlled by changing an external voltage, the original shortcomings of the super-surface are compensated, the effect of aberration elimination is achieved, and a super-lens optical system with wide application prospect and value is constructed.

Description

technical field [0001] The invention belongs to the field of micro-nano optical imaging, and in particular relates to a technical method for eliminating aberrations by combining a super-lens with a liquid medium. Background technique [0002] Because the metalens has many advantages such as thinness and easy adjustment, it will greatly optimize various indicators when it is used for imaging, such as reducing the quality of the optical system, expanding the range of focal length adjustment, improving the repeatability of lens design, and planarization and light weight. level increase, etc. And because of its singular characteristics based on the generalized Snell law of catadioptric reflection, it is easy to reasonably control the wavefront phase, so that it can obtain better performance than existing lenses. It is a popular choice for the design, manufacture and production of optical lenses in the future. [0003] Before an optical system is put into formal use, it is often...

AI Technical Summary

Problems solved by technology

In the specific design process of the metalens, the symmetrical structure of the array unit can be reasonably designed for the parallel light on the axis, and the wavefront phase of the outgoing light is constructed to be spherical, but it cannot overcome the coma aberration (produced by off-axis light source) and astigmatism (large Imaging difficulties caused by high-order aberrations such as meridional and sagittal deviations caused by the field of view), distortion (image scale imbalance caused by a large field of view)

The inability to control the wavefront phase in real time to meet the focusing requirements, or the large high-order aberrations caused by the symmetry of the array structure, is the technical bottleneck that plagues the planar single metalens to achieve a more perfect imaging effect

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