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Broadband photon sieve based on wavefront coding technology

A wavefront coding, photonic sieve technology, applied in optics, optical components, diffraction gratings, etc., can solve problems such as low diffraction efficiency

Inactive Publication Date: 2015-08-26
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has low diffraction efficiency and only images the designed three wavelengths

Method used

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  • Broadband photon sieve based on wavefront coding technology

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment one: see attached figure 1 As shown, a broadband photon sieve based on wavefront encoding technology has a phase encoding plate, one surface of the phase encoding plate is a phase encoding surface 1, and the other surface is a plane, and there is a photon sieve 2 behind the plane, The phase encoding surface 1 is a cubic encoding surface, and the photon sieve diffracts the light passing through the cubic encoding surface for imaging.

[0031] The material of the phase encoding plate can be selected from PMMA plexiglass, and the back is close to the photon sieve surface. photon sieve attached figure 2 As shown, assuming that the incident light is parallel light, the incident light first passes through the phase encoding surface, and then is diffracted by the photon sieve surface to form an image.

[0032] The imaging principle is as follows:

[0033] The diffraction field of the photon sieve is formed by the superposition of the diffraction fields of all mi...

Embodiment 2

[0063] Embodiment 2: A broadband photon sieve based on wavefront encoding technology has a phase encoding plate, one surface of the phase encoding plate is a phase encoding surface, and the other surface is a plane, and the photon sieve is closely attached to the plane , the phase encoding surface is a logarithmic encoding surface, and the surface shape function of the logarithmic encoding surface is , where, , α is 40π, and β is 0.4, and the photon sieve diffracts the light passing through the phase encoding surface into an image.

[0064] The broadband photonic sieve of this embodiment was prepared with a diameter of 50 mm and a focal length of 500 mm. After testing, the bandwidth of the photon sieve was about 14 nm.

Embodiment 3

[0065] Embodiment 3: A broadband photon sieve based on wavefront encoding technology, has a phase encoding plate, one surface of the phase encoding plate is a phase encoding surface, and the other surface is a plane, and a photon sieve is attached to the plane behind , the phase encoding surface is an index encoding surface, and the surface shape function of the index encoding surface is , where, , α is 10π, β is 1.2, and the photon sieve diffracts the light passing through the phase encoding surface into an image.

[0066] The broadband photonic sieve of this embodiment was prepared with a diameter of 50 mm and a focal length of 500 mm. After testing, the bandwidth of the photon sieve was about 14 nm.

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Abstract

The invention discloses a broadband photon sieve based on wavefront coding technology. The photon sieve is characterized in that a phase coding plate is included, one surface of the phase coding plate is a phase coding surface, the other surface is a planar surface, a photon sieve clings to the planar surface, the phase coding surface is one selected from a triple coding surface, a logarithm coding surface and a sine coding surface, and the photon sieve carries out diffractive imaging via light of the phase coding surface. The wavefront coding technology is introduced into the photon sieve field innovatively, the phase coding plate is arranged in front of the photon sieve, wavefront coding is carried out on light entering the photon sieve, the sensitivity of the photon sieve to the wavelength is reduced, and the broadband is expanded.

Description

technical field [0001] The invention relates to an optical element, in particular to a photon sieve, especially a broadband photon sieve using wavefront coding technology. Background technique [0002] Photon sieve is a kind of diffractive optical element proposed by Kipp in 2001, which is similar to Fresnel zone plate, which makes the odd or even Fresnel zone transmit light, while making the adjacent zone opaque. The photon sieve designs the light-transmitting wave bands into light-transmitting microholes, and the microholes are located on the wave bands. The difference between the distance of light waves passing through the center of each microhole to the focus and the distance from the optical axis to the focus is an integer multiple of the wavelength, which can be Achieve focusing and imaging for high-resolution microscopy, spectral imaging, X-ray imaging, UV lithography, etc. [0003] As diffractive optical elements, photon sieves have large chromatic aberrations. Gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/18G02B27/44
CPCG02B5/18G02B27/44
Inventor 王钦华赵效楠许峰
Owner SUZHOU UNIV
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