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Method and device for generating three-dimensional array hollow light spot
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A technology of three-dimensional array and generation method, applied in optics, optical components, instruments, etc., can solve the problems of non-adjustable spot position and non-hollow spot intensity distribution
Inactive Publication Date: 2017-07-07
LUDONG UNIVERSITY
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Chinese invention patent [CN201410360641.8] discloses a method for generating array spot, but only produces two-dimensional square array spot, not three-dimensional array spot, and the position of the spot is not adjustable, and the intensity distribution of the spot is not hollow
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Embodiment 1
[0103] Select the number of rings N=80, the number of sub-rings M=8, corresponding to M=8, it is a three-dimensional square array, and the position parameter of each light spot is (Δx 1 ,Δy 1 ,Δz 1 )=[2μm, 2μm, 2μm]; (Δx 2 ,Δy 2 ,Δz 2 )=[-2μm, 2μm, 2μm]; (Δx 3 ,Δy 3 ,Δz 3 ) = [-2μm, -2μm, 2μm]; (Δx 4 ,Δy 4 ,Δz 4 )=[2μm,-2μm,2μm]; (Δx 5 ,Δy 5 ,Δz 5 )=[2μm, 2μm, 0μm]; (Δx 6 ,Δy 6 ,Δz 6 )=[-2μm, 2μm, 0μm]; (Δx 7 ,Δy 7 ,Δz 7 )=[-2μm,-2μm,0μm]; (Δx 8 ,Δy 8 ,Δz 8 )=[2 μm, −2 μm, 0 μm].
[0104] Figure 4 Shown is a schematic diagram of the device for generating a three-dimensional array of spots. A device for generating a three-dimensional array hollow spot, such as Figure 4 As shown, it includes a laser 1 , a pinhole filter 2 , a collimating lens 3 , a half-wave plate 4 , a spatial light modulator 5 , a light-wave converter 6 , a beam diameter changer 7 and an objective lens 8 . The spatial light modulator 5 is loaded with image 3 Phase shown Figure 10...
Embodiment 2
[0111] The phase diagram when M=9 array spots is selected, such as Figure 11 As shown, where the number of rings N=60, corresponding to the position parameters of 9 spots: (Δx 1 ,Δy 1 ,Δz 1 )=[2cos(π / 4)μm, 2sin(π / 4)μm,1μm], (Δx 2 ,Δy 2 ,Δz 2 )=[2cos(π / 2)μm, 2sin(π / 2)μm,1μm], (Δx 3 ,Δy 3 ,Δz 3 )=[2cos(3π / 4)μm, 2sin(3π / 4)μm,1μm], (Δx 4 ,Δy 4 ,Δz 4 )=[2cos(π)μm, 2sin(π)μm,1μm], (Δx 5 ,Δy 5 ,Δz 5 )=[2cos(5π / 4)μm, 2sin(5π / 4)μm,1μm], (Δx 6 ,Δy 6 ,Δz 6 )=[2cos(3π / 2)μm, 2sin(3π / 2)μm,1μm], (Δx 7 ,Δy 7 ,Δz 7 )=[2cos(7π / 4)μm, 2sin(7π / 4)μm,1μm], (Δx 8 ,Δy 8 ,Δz 8 )=[2cos(2π)μm, 2sin(2π)μm,1μm], (Δx 9 ,Δy 9 ,Δz 9 )=[0 μm, 0 μm, −1 μm].
[0112] Figure 12 It shows that when the parameter M=9 is selected and the light-wave converter composed of a helicalphase plate and a quarter-wave plate is selected, the light wave is loaded with a phase of topological charge n=1 and the polarization becomes a three-dimensional equation of left-handed circularly polarized light...
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Abstract
The invention relates to a method and device for generating a three-dimensional array hollow light spot. The device comprises a laser device, a pinhole filter, a collimator lens, a half-wave plate, a spatial light modulator, an optical wave converter, a beam diameter changer and a microobjective. In addition, the method includes: laser emitted by the laser device is converted into a linear polarization type plane wave; wave-front phase modulation is carried out on the linear polarization type plane wave; and then light after wave-front phase modulation is focused by an objective lens to generate an array light spot. The wave-front phases are in three-dimensional spatial position controllable array light spot phase distribution; and the light wave after wave-front phase modulation needs to be processed by modulation of circular polarization with a spiral phase or angular polarization without a spiral phase. The array light spot is formed by a plurality of hollow light spots arranged in three-dimensional space and each light spot can move precisely in the three-dimensional space. The method and device can be applied to array optical tweezers, super-resolution microscopic imaging and super-resolution nanometer lithography fields.
Description
technical field [0001] The invention relates to a method and device for generating an array spot, in particular to an array spot with a three-dimensional array structure, each spot position is adjustable, and the spot is a hollow structure, which can be used for array optical tweezers, super-resolution microscopic imaging In the field of super-resolution nanolithography. Background technique [0002] The so-called hollow spot means that the center of the spot after the beam is focused is a dark nucleus, where the light intensity is zero. Hollow spots are needed in the fields of optical tweezers technology, high-resolution imaging, and high-density optical storage. "high refractive index" microparticles, and can also capture "low refractive index" microparticles or living cells; In microscopic equipment, it is necessary to produce a hollow spot as lost light in order to obtain microscopic imaging smaller than the diffraction limit; in super-resolution nanofabrication techno...
Claims
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