Complex Amplitude Modulation Method and Device Based on Huygens Metasurface

Abstract

The invention discloses a complex amplitude modulation method and device based on the Huygens metasurface, and the method comprises the steps: optimizing the height of a metasurface unit by changing the arm length and the arm width of a dielectric block, and selecting a preset working wavelength, so that an electrode harmonic peak and a dipole harmonic peak of the metasurface unit coincide with each other; gradually adjusting preset parameters in a first preset interval, and fixing other parameters to linearly adjust and control the target amplitude and obtain a first two-dimensional distribution map; gradually rotating a rotation angle between the metasurface unit and the X axis in a second preset interval so as to linearly regulate and control the target phase and obtain a second two-dimensional distribution map; and obtaining the complex amplitude distribution according to the preset parameters, the rotation angle, the first two-dimensional distribution map and the second two-dimensional distribution map, so as to obtain the modulation parameters corresponding to any complex amplitude according to the obtained geometric dimension information and rotation angle information of allthe metasurface units. The method is based on the metasurface designed based on the Huygens principles, and can be widely applied to the fields of light field shaping, integrated optoelectronic systems, holographic display and the like.

Description

technical field [0001] The invention relates to the field of micro-nano optics technology, in particular to a complex amplitude modulation method and device based on a Huygens metasurface. Background technique [0002] The holographic display realizes the true reproduction of the three-dimensional scene by reconstructing the wavefront information of the object light wave. The wavefront of the object light wave contains the complex amplitude information of the amplitude and phase when it propagates to the holographic imaging plane. At present, people have not developed a recording material that can simultaneously record the amplitude and phase. Therefore, decomposing the complex amplitude modulation into amplitude or phase information and then modulating is the current solution. The amplitude or phase information of the complex amplitude conversion is loaded onto the DMD (Digital Micromirror Device) or LCoS (Liquid Crystal on Silicon, liquid crystal on silicon device), and ...

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Problems solved by technology

[0005] In related technologies, a near-field surface plasmon complex amplitude modulation method based on metasurfaces mentions a method of realizing complex amplitude modulation by changing the nano-rectangular column structure and the rotation structure, but these works mentioned There are problems in the devices, some of which have low polarization conversion efficiency, and some have a great impact because of the non-linear variation of amplitude or phase with parameters, resulting in processing errors

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