Polarization multiplexing short-focus beam expansion projection system and method based on micro-nano structure

Abstract

The invention provides a projection system and method. The projection system comprises a light signal generation apparatus used for loading each sub image circularly based on a preset sequence and generating signal light carrying with information of each sub image, a polarizing apparatus used for converting the signal light into polarized light, a micro-nano antenna array used for converting eachbeam of polarized light into multiple beams of emergent light of different polarized states, and a polarization analyzer used for outputting the emergent light of one polarized state corresponding toeach sub image to an image surface, wherein all the above components are arranged along a light path in sequence; and each polarized state is determined according to a preset rule. The projection method comprises the steps of loading each sub image circularly based on a preset sequence and generating signal light carrying with information of each sub image; converting the signal light into polarized light; converting each beam of polarized light into multiple beams of emergent light of different polarized states; and outputting the emergent light of one polarized state, determined according tothe preset rule, corresponding to each sub image to the image surface. By virtue of the projection system and method provided by the invention, the size of the projection system is reduced.

Description

technical field [0001] The present invention relates to the technical field of applied optics, and more particularly, to a projection system and method. Background technique [0002] At present, as a development direction of new ultra-thin optical structures, micro-nano structures are widely used in polarizers, vector beam construction, planar lens construction, holographic display, etc. Using the electromagnetic response characteristics of nanoscale structural units that are close to the wavelength scale of incident light, the phase and amplitude modulation functions of incident light can be realized to obtain functions such as beam polarization state conversion, beam convergence and divergence, and holographic image display. It is precisely because the micro-nano structure is similar to the wavelength scale of light waves that it can get rid of the defect of excessively large scale of traditional optical components, and it is applied to the micro-structured optical system,...

AI Technical Summary

Problems solved by technology

Existing projection systems use a large number of traditional optical components including optical waveguides, prism groups, lens groups, etc. The overall volume is large and the structure is complex. During the projection display process, many parameters need to be adjusted and are greatly affected by the environment.

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