Coding Method for Metal Thin Film Computational Hologram
A technology of computational holography and coding method, applied in the field of metal thin film computational hologram coding, can solve the problem that metal thin film holograms are not very suitable, and achieve the effects of good reproduction image quality, great flexibility and high diffraction efficiency
Active Publication Date: 2018-06-01
ANHUI NORMAL UNIV
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Therefore, it is not very suitable to use the Roman coding method to make metal thin film holograms.
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[0037] The present invention is a kind of coding method that is applicable to the calculation hologram of metal thin film, comprises the following steps:
[0038] 1) Calculate the number of sampling points according to the cut-off frequency of the target image f(x,y), discretize the target image into matrix data of M*N size, and calculate the discrete Fourier transform spectrum F(u,v);
[0039] 2) Divide the hologram into units of M*N size;
[0040] 3) Encode the amplitude A(u,v) and phase Φ(u,v) of the Fourier transform spectrum F(u,v) with metal nanorods, and sample the length L of the metal nanorods to encode the amplitude A(u,v) v), the rotation angle of the metal rod is used to encode the phase Φ(u, v).
[0041] The encoding method of the amplitude is: the width of each unit nanorod is 50nm, and the length Among them, max(A) represents the maximum value of Fourier spectrum A(u, v), λ is the illumination wavelength, and Amn is the amplitude of the mnth unit.
[0042] T...
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The invention discloses an encoding method of a metal film computer-generated hologram. The method includes the steps of firstly, acquiring the sampling number according to the cut-off frequency of a target image f (x, y), discretizing the target image into matrix data of the size of M*N, and calculating discrete Fourier transform spectrum F (u, v); secondly, dividing the hologram into units of the size of M*N; thirdly, using a metal nano rod to encode the amplitude A (u, v) and phase phi (u, v) of the discrete Fourier transform spectrum F (u, v), using the length L of the sampling metal nano rod to encode the amplitude A (u, v), and using the rotation angle of the metal rod to encode the phase phi (u, v). The encoding method has the advantages that the problems of hologram production by using metal films are solved, the encoded hologram is high in diffraction efficient and good in reproductive image quality, the length of the metal nano rod is used to encode the amplitude, the rotation angle of the metal rod is used to encode the phase, the method is simple in principle and convenient to adjust, and high flexibility in hologram design is achieved.
Description
technical field [0001] The invention relates to the technical field of optical holography, in particular to a metal thin film calculation holographic encoding method. Background technique [0002] Computational holograms refer to the use of computers to generate holograms according to a certain encoding method. It does not require the real existence of object waves and reference light waves. It can be generated only by using a computer, and it is very convenient to use. In computational holography, the input information is a spatial complex signal, and in the final stage of reproduction, the complex spatial wavefront must be synthesized in an optical form, and the intermediate transmission or storage medium (also called a transmission channel) is a computational hologram. Therefore, imitating the communication system, the process of transforming the complex signal into the transmittance change function of the calculated hologram is called the encoding process. [0003] We k...
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IPC IPC(8): G03H1/08
CPCG03H1/0866
Inventor 石建平赵小童黄万霞吴彬左则文
Owner ANHUI NORMAL UNIV