Variable-focus super lens based on polymer network liquid crystal and preparation method

Abstract

The invention provides a variable-focus super lens based on polymer network liquid crystal and a preparation method. The variable-focus super lens comprises a first substrate layer, a super-lens layer, a polymer network liquid crystal layer and a second substrate layer which are sequentially arranged in the direction of an incident light path, wherein the first substrate layer comprises a first base and a first conductive layer located on a side face, facing the second substrate layer, of the first base, the super-lens layer comprises a plurality of nano resonance units which are periodicallydistributed according to a sequence, the super-lens layer is formed on the first conductive layer, the polymer network liquid crystal layer comprises polymer network liquid crystal filled between thesuper-lens layer and the second substrate layer, the second substrate layer comprises a second base, a second conductive layer located on a side face, facing the first substrate layer, of the second base, and a liquid crystal alignment layer formed on the second conductive layer. Based on combination of the liquid crystal material and a super lens, the function of the variable-focus super lens isrealized, and the application range of the super lens is expanded.

Description

technical field [0001] The invention relates to the field of micro-nano optics, in particular to a variable-focus superlens based on polymer network liquid crystals and a preparation method thereof. Background technique [0002] In recent years, based on metasurfaces, researchers have designed various metalenses with novel functions. Different from traditional optical lenses, metalenses are composed of subwavelength periodic resonant units, which have extraordinary electromagnetic properties that natural materials do not have. By using a thickness much smaller than the wavelength, an arbitrary phase gradient can be generated to achieve beam focusing. Precisely regulated, it is a veritable ultra-thin lens. [0003] A metalens is composed of electromagnetic resonance units whose scale is much smaller than the working wavelength. The key to controlling the wavefront phase is to properly introduce the phase gradient. At present, there are three main methods to introduce phase ...

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Problems solved by technology

This is difficult to meet the application requirements that require real-time adjustment of the focal length to achieve dynamic imaging

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