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Liquid-crystal-optical-phased-array-based three-dimensional independent control methods for light beam focal points

A technology of liquid crystal optics and independent control, which is applied in the cross field of liquid crystal optics, applied optics and diffractive optics, and can solve the problems of high power consumption and heavy weight

Inactive Publication Date: 2011-07-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of large power consumption and heavy weight caused by mechanical inertia in the existing method, and the defect that the control mode is passive control, the present invention proposes a three-dimensional independent control method of beam focus based on liquid crystal optical phased array

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  • Liquid-crystal-optical-phased-array-based three-dimensional independent control methods for light beam focal points
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  • Liquid-crystal-optical-phased-array-based three-dimensional independent control methods for light beam focal points

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specific Embodiment approach 1

[0059] Specific implementation mode one: combine figure 1 and image 3 To illustrate this embodiment, the method for three-dimensional independent control of the beam focus based on liquid crystal optical phased array in this embodiment is the aperture division method, and its steps are as follows:

[0060] Step 1: Set the grating of the liquid crystal optical phased array 11; first divide the effective aperture of a liquid crystal optical phased array 11 into n sub-apertures 12, wherein n is a natural number, and then form a two-dimensional period on each sub-aperture 12 Variable blazed grating 13 and variable focus lens phase grating 14;

[0061] Since two one-dimensional period variable blazed gratings can be orthogonally extended to a two-dimensional period variable blazed grating, the phase of the two-dimensional period variable blazed grating 13 described here is:

[0062] formula one

[0063] In formula one, and represent the one-dimensional periodic variable b...

specific Embodiment approach 2

[0084] Specific implementation mode two: combination figure 2 , Figure 4 and Figure 5 Describe this embodiment, the steps of the method for three-dimensional independent control of beam focus based on liquid crystal optical phased array in this embodiment are as follows:

[0085] Step 1: setting the grating of the liquid crystal optical phased array 11; forming a two-dimensional isosceles triangular phase grating 15 and a two-dimensional lens phase grating or lens array grating 16 on the liquid crystal optical phased array 11,

[0086] The phase transmittance function of the two-dimensional isosceles triangular phase grating 15 is expressed as follows:

[0087] t 1 (x, y) = t 1 (x)t 1 (y) Formula 9

[0088] The grating periods of the one-dimensional isosceles triangular phase grating in the x direction and the one-dimensional isosceles triangular phase grating in the y direction are both T, and each grating period has a height of φ h isosceles triangle;

[0089] Qua...

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Abstract

The invention relates to liquid-crystal-optical-phased-array-based three-dimensional independent control methods for light beam focal points, and belongs to the technical field of the intersection of liquid crystal optics, application optics and diffraction optics. By the methods, the problems of large power consumption and weight caused by mechanical inertia in the conventional method are solved, and the defect that a control mode is passive control is overcome. In one of the two methods, an effective aperture of a liquid crystal optical phased array is divided into a plurality of sub-apertures, and a composite phase grating formed by combining a two-dimensional period variable sparkling grating and a focus-variable lens phase grating is formed on each sub-aperture; in the other method, a composite phase grating formed by combining a two-dimensional isosceles triangle phase grating and a two-dimensional lens phase grating or a lens array grating is formed on each sub-aperture; and in the two methods, the phase control focal points of the composite phase gratings are adjusted to move arbitrarily in a mode of no mechanical inertia in three-dimensional space. Therefore, by the methods, the problem caused by the mechanical inertia is solved, and the three-dimensional independent control without the mechanical inertia on light beams can be realized actively.

Description

technical field [0001] The invention belongs to the cross technical fields of liquid crystal optics, applied optics and diffractive optics. Background technique [0002] The method of using liquid crystal optical phased array to programmably control the movement of single beam focus or multi-beam focus without mechanical inertia in three-dimensional space is of great significance for the application of three-dimensional optical tweezers, laser direct writing, optical interconnection and other fields. In particular, the application prospect of three-dimensional multi-optical tweezers is great. Using this technology, single-optical optical tweezers can realize three-dimensional manipulation of a single particle. Multi-optical tweezers can simultaneously capture multiple particles in different positions in space, and the captured particles A three-dimensional operation performed independently by each particle. [0003] At present, the existing methods for realizing three-dimen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13G02B5/18
Inventor 张建王东甘雨吴丽莹刘翔程欣
Owner HARBIN INST OF TECH