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Broadband photon screen based on phase coding

A phase encoding and photonic sieve technology, which is applied in the field of broadband photonic sieves, can solve problems such as low diffraction efficiency, and achieve the effects of improving energy efficiency, widening bandwidth, and being easy to process.

Active Publication Date: 2015-12-09
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 screen based on phase coding
  • Broadband photon screen based on phase coding
  • Broadband photon screen based on phase coding

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Embodiment 1

[0031] Example 1: see figure 1 As shown, a phase-encoded broadband photon sieve with a diameter of D includes a transparent flat substrate and an opaque metal film plated on the transparent flat substrate. The opaque metal film is provided with ring-shaped distributed light Small holes, the position distribution of the light holes satisfies the equation , Where f is the focal length of the broadband photon sieve, n is the ring number of the light-passing annulus, λ is the working wavelength of the photon sieve, R is the radius of the broadband photon sieve, α is the third coding coefficient, k is the wave number, x m And y m Is the center position of the m-th small hole on the n-th pass-through ring belt, m=1,2,3 … num, where , , The hole radius .

[0032] In this embodiment, the third-order coding coefficient α is 20π.

[0033] In this embodiment, the transparent flat substrate is glass with a thickness of 2 mm.

[0034] In this embodiment, the opaque metal film is an opaque c...

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Abstract

The invention discloses a broadband photon screen based on phase coding. The diameter of the photon screen is D. The photon screen comprises a transparent panel substrate and a light-proof metal thin film plated on the transparent panel substrate. Light penetrating small holes are distributed in the light-proof metal thin film in a ring strip-shaped manner. The position distribution of the light penetrating small holes can be represented by the formula in the description, wherein f represents the focal length of the photon screen; n represents serial number of a light penetrating ring belt; lambda represents operating wavelength of the photon screen; R represents radius of the photon screen; alpha represents three times of coding coefficients; k represents wave number; x<m> and y<m> represent the central position of nth small hole in nth light penetrating ring strip; and m=1, 2, 3, ..., num. In the formula, the num, the r<n> and the radius of the small holes alpha<n> are represented by formulas in the description. According to the invention, the photon screen is provided with a coding function of a phase coding plate and the focusing function of a traditional photon screen, so sensibility to wavelength of the screen is largely reduced; bandwidth of the photon screen is extended without effects on resolution ration of the photon screen; and energy efficiency is also increased.

Description

Technical field [0001] The invention relates to an optical element, in particular to a photon screen, in particular to a phase-encoded broadband photon screen. Background technique [0002] In the prior art, the photon sieve is a diffractive optical element proposed by Kipp in 2001. It is similar to the Fresnel zone plate in that it transmits light through the odd or even Fresnel zone and makes adjacent waves With opaque. The photon sieve designs the light-transmitting band into light-transmitting micropores. The micropores are located on the waveband. The difference between the distance between the light wave passing through the center of each microhole and the distance reaching the focal point through the optical axis is an integer multiple of the wavelength Realize focusing and imaging, used in high-resolution microscope, spectral imaging, X-ray imaging, UV lithography, etc. [0003] As a diffractive optical element, the photon screen has great chromatic aberration. Generally...

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 王钦华赵效楠许峰胡敬佩
Owner SUZHOU UNIV
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