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
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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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