Metalens Optical Design Method for Diffractive Element Optimization
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Solution Overview
Problem
Conventional optical design methods struggle to effectively design configurations that include metalens due to the difficulty in accounting for the 'optical trap' effect and nonlinear refractive index changes, making it challenging to optimize the fine patterns required for efficient light diffraction and transmission.
Innovation Solution
An optical design method that involves setting initial step patterns for binary optics, calculating phase data based on specific wavelengths, identifying corresponding meta-atom patterns, and designing conventional lenses to facilitate the integration of metalens in optical systems, using vector models and finite element methods to accurately simulate light behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional optical design methods using equivalent refractive index method are used, then the design process is simple, but the accuracy of accounting for optical trap effect and nonlinear refractive index changes is insufficient
Solution Approach 1:
The patent introduces an intermediary computational model that bridges the gap between simple equivalent refractive index methods and complex first-principles simulations. This model incorporates optical trap effects and nonlinear refractive index changes as intermediate computational steps, allowing accurate physics-based calculations while maintaining a structured design workflow that is more manageable than full first-principles approaches.
Solution Approach 2:
The patent transforms the design approach by changing key parameters from static equivalent refractive index values to dynamic parameters that account for optical trap effects and nonlinear refractive index variations. This involves introducing wavelength-dependent refractive index calculations and optical trap effect coefficients as variable parameters that adapt to different operating conditions, thereby improving accuracy without requiring complete redesign of the computational framework.
2Volume of moving object
If fine patterns with wavelength or less dimensions are formed on flat substrate, then compact metalens can be achieved, but the processing difficulty and optimization complexity increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relationships between fine pattern geometries and their corresponding optical responses in lookup tables or pre-computed databases. During the actual design process, these pre-computed data are referenced to rapidly determine optimal pattern dimensions, avoiding the need to perform complex optimization calculations for each design iteration, thus reducing optimization complexity while maintaining compact metalens design capability.
Solution Approach 2:
The patent uses copying by creating simplified surrogate models or proxy representations of the complex fine pattern structures. These surrogate models capture the essential optical behavior of wavelength-scale patterns but with reduced computational complexity, allowing designers to work with simplified representations that can be easily optimized and then transferred to the actual metalens fabrication process.
3Reliability
If multiple exposure times are used to form metamaterial structure, then the lens action can be achieved, but the manufacturing process becomes more complex with twice or more exposures
Solution Approach 1:
The patent merges multiple exposure steps into a unified design framework by combining the optical effects of multiple exposures into a single equivalent pattern design. Instead of treating each exposure as a separate manufacturing step requiring independent optimization, the method integrates the cumulative optical effects into a unified computational model that determines the final pattern geometry, thereby achieving the desired lens action while simplifying the manufacturing process to a single exposure step.
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
This approach allows for the identification and design of fine patterns necessary for metalens, enabling efficient optical design and reducing the complexity of optimizing metalens performance within optical systems, thereby improving design efficiency and accuracy.
Implementation Method 1
The diffractive optical element (DOE) is an element that controls a light using a diffraction action
Implementation Method 2
conventional lenses that control a light using a refraction action
Implementation Method 3
conventional lenses that control a light using a refraction action and a reflection action
Data Source
AI summary
An optical design method attempting facilitation of optical design of a configuration including a metalens. The optical design method includes a setting step, a first calculating step, a first identifying step, a second calculating step, a second identifying step, and a designing step. The first calculating step calculates first phase data indicating a relation of a phase to a shape of a meta-atom based on a preliminarily set first wavelength. The first identifying step calculates a first phase pattern from a first step pattern and identifies a fine pattern indicating the shape of the meta-atom corresponding to the first phase pattern by referring to the first phase data. The second calculating step calculates second phase data different from the first phase data based on a preliminarily set second wavelength different from the first wavelength.