All-Dielectric Flat Lens Fabrication with Low Refractive Index
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Solution Overview
Problem
Traditional optical lenses are limited by strict geometric relationships and high refractive index materials, leading to bulky size and low transmission for visible light, hindering miniaturization and integration in optoelectronic technologies.
Innovation Solution
A method for fabricating an all-dielectric flat lens with low refractive index using dielectric pillars with a refractive index not less than 2.5, arranged in a periodic pattern on a substrate, to achieve phase modulation and improve transmission in the visible light range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optical lenses use high refractive index materials (metal or dielectric), then the lens can achieve refractive imaging, but the transmission for visible light becomes low and absorption becomes large
Solution Approach 1:
The patent changes the refractive index parameter of the lens material from high (metal or high-index dielectric) to low (specifically 1.45-2.5 range), which fundamentally alters the light-matter interaction to reduce absorption and improve transmission while maintaining imaging capability through metasurface phase modulation
Solution Approach 2:
The patent employs composite material structures combining dielectric substrate material with dielectric pillar structure material, both selected from low refractive index materials, to achieve the desired optical properties of high transmission and low absorption in the visible light range
2Reliability
If traditional optical lenses use strict geometric relationships and natural optical materials, then refractive/reflective imaging can be implemented, but the lens becomes bulky and design freedom is limited
Solution Approach 1:
The patent divides the continuous lens profile into discrete dielectric pillar units arranged in a periodic pattern, where each pillar acts as an independent phase modulation element, enabling digital-like design freedom and simplification of the optical path
Solution Approach 2:
The patent replaces the traditional mechanical/geometric lens profile (curved surfaces, thick materials) with a metasurface structure consisting of sub-wavelength dielectric pillars, substituting geometric refraction with resonant phase modulation to achieve thin, lightweight imaging
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 method enables the creation of a lightweight, high-transmission all-dielectric flat lens with improved portability and integration capabilities, specifically enhancing transmission in the visible light range from 480 nm to 780 nm.
Implementation Method 1
A method of fabricating an all-dielectric flat lens with low refractive index... selecting a dielectric substrate material and a lens structure material from an all-dielectric material with low refractive index... calculating a phase modulation corresponding to each pillar unit
Data Source
AI summary
A method is disclosed of fabricating all-dielectric flat lens with low refractive index comprising: selecting dielectric substrate material and lens structure material; determining incident wavelength; calculating phase modulation corresponding to each pillar unit; periodically sampling circular area of dielectric substrate with radius to obtain plurality of sampling points; calculating phase modulation required at position of each sampling point; obtaining pillar corresponding to each sampling point; arranging different dielectric pillars with low refractive index and same thickness are arranged on dielectric substrate, thereby obtaining all dielectric flat lens with low refractive index. Also disclosed is method of fabricating all-dielectric flat lens with low refractive index that fabricates plane divergent lens with high transmission in wavelength range of visible light, and providing all-dielectric flat lens with low refractive index to improve transmission in visible light region through using dielectric with low refractive index to replace metal and dielectric with high refractive index.