Silicon nanobrick array structure and its design method applied to Fourier three-dimensional holography

Abstract

The invention discloses a silicon nanometer brick array structure applied to a Fourier three-dimensional holography and a design method therefor. The silicon nanometer brick array structure is an array formed by silicon nanometer brick units in arrangement; each silicon nanometer brick units comprise dielectric substrates and silicon nanometer bricks etched in the dielectric substrates; in the array, the lengths, widths and heights of all the dielectric substrates are equal; and the lengths, widths and heights of the silicon nanometer bricks are designed according to phase requirements. The silicon nanometer brick array structure enables linearly polarized lights parallel to the long edge direction of the nanometer bricks and the linearly polarized lights parallel to the wide-edge direction of the nanometer bricks to be subjected to holographic sheet diffraction to represent different holographic images; and a three-dimensional holographic effect with a high signal to noise ratio, a large viewing angle and good experiment can be observed based on a parallax effect through polarized glasses; and the silicon nanometer brick array structure is simple in process, and can be widely applied to the fields of display, sensing, anti-counterfeiting, information memory and the like.

Description

technical field [0001] The invention relates to the technical fields of micro-nano optics and optical holography, in particular to a silicon nano-brick array structure and a design method thereof applied to Fourier three-dimensional holography. Background technique [0002] Traditional holography uses a coherent light source to irradiate a real object, and then interferes with a reference light to form a hologram, and uses the reference light to irradiate the hologram to achieve diffraction reproduction. Computational holography can realize objects that do not exist in reality by optimizing the amplitude and phase distribution of holographic sheets, which is an important breakthrough in holographic technology. At present, computational holography focuses on realizing two-dimensional holograms, such as laser holographic keyboards, random light point generators, etc. To achieve three-dimensional computational holography, there are still many difficulties. Under the condition...

AI Technical Summary

Problems solved by technology

To achieve three-dimensional computational holography, there are still many difficulties

Under the condition that many approximate calculations need to be satisfied, some 3D computational holograms with simple patterns, poor visual effects, and even observation with a microscope have been reported. [1] , so 3D computational holography still has a lot of room for innovation and development

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