Composite spiral zone plate and construction method thereof

Abstract

The invention discloses a composite spiral zone plate and a construction method thereof. The composite spiral zone plate is constructed through the following method: determining a parameter of a firstspiral zone plate and the parameter of an annular first filter disc, compositing the first spiral zone plate and the first filter disc to form a first inner ring part through coaxially sheltering; determining the parameter of a second spiral zone plate, and compositing the second spiral zone plate and a second filter disc which is formed previously and accords with the inner ring part to form anexternal ring part through coaxially sheltering; and coaxially embedding the inner part in the external ring part, and adjusting the number of spiral wave zones of the second spiral zone plate to enable an optical vortex formed by the external ring part to have the same strength with the optical vortex formed by the inner ring part. The composite spiral zone plate constructed according to the method provided by the invention has two optical vortexes with the same strength, axial positions of the two optical vortexes can be freely adjusted according to corresponding parameters thereof, and consequently, the constructed complex spiral zone plate can realize high-capacity optical information storage and optical communication and realize axial multi-plane dynamic operation to particles in a three-dimensional light photography technology, and so on.

Description

Technical field [0001] The invention relates to optoelectronic technology, in particular to a composite spiral wave zone plate and a construction method thereof. Background technique [0002] Multiple optical vortices have many applications in different fields. Multiple optical vortices on the optical axis can be used to simultaneously capture particles, and array vortices with fractional topological charges can be used for optical sorting. [0003] Spiral photos can be used to generate optical vortices. The interfering double vortex light with two opposite unequal topological charges can be used to generate wheelchair and ring light at the focal plane. The spiral zone plate can produce light vortices in the focal plane. The square spiral zone plate can produce different focused light vortices. The spiral zone plate can be used in the field of soft X-ray microscopy. The spiral zone plate can be used to measure the rotating Doppler effect of plane-polarized light with a spiral w...

AI Technical Summary

Problems solved by technology

However, these phase-type devices are difficult to fabricate

All in all, the above-mentioned devices cannot simply generate two equal-intensity optical vortices in the axial direction

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