Abstract
Conventional multicolor metaholograms suffer from the fundamental limitations of low resolution and irreducible noise because the unit structure functionality is still confined to a single wavelength. Here, we propose wavelength-decoupled metasurfaces that enables to control chromatic phase responses independently in a full range from 0 to 2π for each wavelength. The propagation phase associated with the geometric phase of rectangular dielectric nanostructures plays a critical role to embed a dual phase response into a single nanostructure. A multicolor metahologram is also demonstrated to verify the feasibility of our method that breaks through the fundamental constraints of conventional multicolor metaholograms. Our approach can be extended to achieve complete control of chromatic phase responses in the visible for general dual-wavelength diffractive optical elements.
Highlights
Conventional multicolor metaholograms suffer from the fundamental limitations of low resolution and irreducible noise because the unit structure functionality is still confined to a single wavelength
Design principles of achromatic metalenses are invalid for general applications such as multicolor metaholograms a because they require independent full-phase control by wavelengths
Many multicolor metaholograms have been demonstrated based on interleaved subarrays[36,37,38,39,40] and multiple positions[41,42,43], their unit structure functionality is still confined to a single wavelength resulting fundamental limitations of low resolution and irreducible noise
Summary
Conventional multicolor metaholograms suffer from the fundamental limitations of low resolution and irreducible noise because the unit structure functionality is still confined to a single wavelength. Design principles of achromatic metalenses are invalid for general applications such as multicolor metaholograms a because they require independent full-phase control by wavelengths. Many multicolor metaholograms have been demonstrated based on interleaved subarrays[36,37,38,39,40] and multiple positions[41,42,43], their unit structure functionality is still confined to a single wavelength resulting fundamental limitations of low resolution and irreducible noise. The experimentally demonstrated multicolor metahologram verifies our design principle overcoming fundamental limitations of conventional multicolor metaholograms, so our approach to designing wavelength-decoupled metasurfaces is capable of realizing general dual-wavelength optical devices
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