Multi-Layer Metalens Chromatic Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional refractive optical systems are challenging to manufacture in compact sizes and become complex when trying to control complex light wavefronts or light paths, leading to issues such as chromatic aberration.
Innovation Solution
A metalens with a metasurface comprising metaatoms formed in multiple layers, where the length between the center and edge of each layer decreases from the bottom to the top, is used to reduce or eliminate chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a refractive optical system is used, then it is easy to manufacture and the design is intuitive, but the system requires large thickness or multiple lenses making it difficult to manufacture in compact size
Solution Approach 1:
The patent transitions from conventional refractive optics operating in three-dimensional space to metasurfaces operating in two-dimensional space. The metalens is formed as a planar structure with metaatoms arranged on a surface, reducing the optical system from volumetric (3D) to planar (2D) configuration, thereby achieving compact size while maintaining optical functionality
Solution Approach 2:
The patent divides the continuous refractive optical system into discrete metaatoms arranged in specific patterns. Each metaatom acts as an independent optical element with specific phase modulation capabilities, allowing the system to achieve complex wavefront control through coordinated action of segmented elements rather than requiring a single bulky lens
2Ease of operation
If a refractive optical system is used, then the design is intuitive for simple optical systems, but the design becomes complicated for controlling complex light wavefront or light path
Solution Approach 1:
The patent controls light wavefronts by systematically varying parameters of metaatoms including their geometric dimensions (width, height, shape), material composition, and spatial arrangement. By changing these parameters, different phase delays and amplitude modulations are achieved, enabling complex wavefront control through parameter optimization rather than complex system architecture
Solution Approach 2:
The patent replaces the mechanical/refractive approach of shaping light through curved lens surfaces with an optical/diffractive approach using sub-wavelength metaatoms. Instead of relying on geometric refraction from thick lens elements, the system uses controlled light-matter interaction at the nanoscale to achieve wavefront modulation, simplifying the design process for complex optical functions
3Device complexity
If a single-layer metalens is used, then the structure is simple, but chromatic aberration cannot be reduced or eliminated
Solution Approach 1:
The patent employs a multi-layer metalens structure where metaatoms are arranged in multiple stacked layers. Each layer contains metaatoms with specific geometric configurations that contribute to the overall phase modulation. The layers are nested in the vertical dimension, with each layer's metaatoms working cooperatively to achieve chromatic aberration correction through cumulative phase control across different wavelengths
Solution Approach 2:
The patent uses metaatoms composed of multiple materials with different optical properties (refractive indices, absorption coefficients) arranged in composite structures. These composite metaatoms enable simultaneous control of phase and amplitude for different wavelengths, allowing chromatic aberration reduction through material diversity rather than structural complexity alone
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The metalens effectively reduces or eliminates chromatic aberration, enabling more compact and efficient optical systems with improved light modulation capabilities.
Implementation Method 1
A lens for focusing incident light on an image sensor is typically used as the optical system. The refractive optical system may control light wavefronts or light paths of transmitted or reflected light by adjusting a degree of light refraction that occurs due to a difference in refractive index of materials when light passes through different materials.
Data Source
AI summary
A metalens includes a substrate, and a metasurface provided on the substrate and including a plurality of metaatoms, where at least one of the plurality of metaatoms may include a plurality of layers.