Multifocal quasi-Fibonacci zone plate and construction method thereof

A zone plate and multi-focus technology, applied in the field of multi-focus Fibonacci zone plate and its structure, can solve the problems of low axial main focus intensity and stable particle capture effect, etc., and achieve the effect of regular arrangement

Active Publication Date: 2018-02-23
YANGTZE UNIVERSITY
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Problems solved by technology

However, the intensity of the axial main focus of the Thue-Morse zone plate is

Method used

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  • Multifocal quasi-Fibonacci zone plate and construction method thereof
  • Multifocal quasi-Fibonacci zone plate and construction method thereof
  • Multifocal quasi-Fibonacci zone plate and construction method thereof

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[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0020] The invention relates to a multi-focus Fibonacci-like zonal plate, wherein the zonal plate is composed of transparent rings and opaque rings alternately according to the arrangement rules of Fibonacci-like binary (A / B) aperiodic sequence letters Composition, the phase at the transparent annulus is set to π, and the phase at the opaque annulus is set to 0; wherein, the zone plate has two main focal points with equal intensity along the axial direction, distributed around each main focal point There are multiple sub-foci, wherein the sub-foci located between two main foci have less intensity t...

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Abstract

The invention discloses a multifocal quasi-Fibonacci zone plate and a construction method thereof. The construction method comprises the steps of: acquiring a Fibonacci binary (A/B) aperiodic sequencebased on a recursion mode of Fibonacci numbers; and extending a recursion mode of the Fibonacci binary sequence to obtain a new recursion rule. According to the recursion rule, a new binary aperiodicsequence can be created, which is called a quasi-Fibonacci binary sequence. Based on the new sequence, the corresponding zone plate can be constructed by means of a transmittance function. The zone plate produces a series of focal points in the direction of an optical axis of an incident light beam, the focal points have the advantage of good polychromaticity, and imaging by means of the multifocal quasi-Fibonacci zone plate can reduce the color difference of the imaging; meanwhile, the multifocal quasi-Fibonacci zone plate has the plurality of focal points with relatively great intensities in the axial direction, can be used for binding and manipulating tiny objects, and can be used for constructing a three-dimensional optical trap array, so as to realize regular arrangement of particlesin a three-dimensional space.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a multi-focus Fibonacci-like zone plate and a construction method thereof. Background technique [0002] In photonics technology, diffractive optical elements are more flexible than geometric optical elements (such as: refracting prisms, pyramids, etc.). In addition, diffractive optical elements can also solve problems that traditional geometric optical elements cannot solve. A Fresnel zone plate composed of alternating transparent and opaque annular zones produces a principal focal point in the axial direction [Ref. 1]. This zone plate has very important applications in many scientific research fields, such as terahertz tomography[ References 2-4], Soft X-ray Microscopy [Refs 5-7], Photolithography [Refs 8], Optical Data Reading and Writing [Refs 9], Optical Tweezers [Refs 10-13 ]Wait. Although this traditional zone plate is still widely used, this type of zone plate ...

Claims

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Application Information

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IPC IPC(8): G02B5/18
CPCG02B5/1876
Inventor 程书博刘孟思
Owner YANGTZE UNIVERSITY
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