Optical Material with Minute Resonators for Negative Refractive Index
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Solution Overview
Problem
Current optical materials, such as conventional optical glass, have relative permeability of 1 and refractive indices greater than 1, limiting their application in achieving negative refractive indices for visible and infrared light, and existing methods for creating meta-materials with negative refractive indices face challenges in precision and stability when producing split-ring resonators.
Innovation Solution
The development of an optical material comprising minute resonators made of conductors with a width similar to or smaller than the illumination light wavelength, covered by an insulator or semiconductor protective film, allowing for relative permeability different from 1, and the creation of optical liquids and elements by mixing or solidifying these resonators, enabling negative refractive indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical glass is used, then the material has a relative permeability of 1 and refractive index greater than 1, but it cannot achieve negative refractive index required for certain optical applications
Solution Approach 1:
The patent employs composite materials consisting of metallic resonators (such as split-ring resonators) embedded in a dielectric matrix. This composite structure enables the material to exhibit negative refractive index by combining the resonant properties of metals with the structural stability of dielectrics, thereby achieving refractive indices less than 1 including negative values that conventional optical glass cannot provide.
Solution Approach 2:
The patent changes the fundamental electromagnetic parameters of the optical material by introducing resonant structures with specific geometries and dimensions. By adjusting the size, shape, and arrangement of metallic resonators, the effective permittivity and permeability of the composite material can be tuned to achieve desired negative refractive indices at specific frequencies.
2Reliability
If split-ring resonators are used to achieve negative refractive index, then the relative permeability becomes negative, but the manufacturing precision and structural stability are compromised
Solution Approach 1:
The patent utilizes thin-film fabrication techniques to create metallic resonator structures. By depositing metal layers in thin-film form and patterning them through standard semiconductor manufacturing processes, the resonators achieve the required precision without requiring complex assembly steps, thereby improving both manufacturing precision and structural stability.
Solution Approach 2:
The patent replaces mechanical assembly methods with direct lithographic patterning and thin-film deposition processes. Instead of manually assembling complex resonator structures, the resonators are formed in a single integrated process using photolithography and sputtering/deposition techniques, significantly enhancing manufacturing precision and repeatability.
3Reliability
If metallic resonators are used to achieve negative refractive index, then the optical properties are improved, but the production cost and manufacturing complexity increase
Solution Approach 1:
The patent designs resonator structures that can be fabricated using standard, widely-available thin-film deposition and lithography equipment already present in semiconductor and display manufacturing facilities. This universal approach allows the same manufacturing infrastructure to produce both conventional and metamaterial optical components, reducing additional capital investment and simplifying production.
Solution Approach 2:
The patent combines multiple resonator units into periodic arrays or supercells that can be fabricated as single integrated structures. By merging individual resonator fabrication steps into unified lithographic patterns, the manufacturing process is simplified while maintaining the complex electromagnetic response required for negative refractive index.
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 production of optical materials with relative permeability different from 1, achieving stable structures with negative refractive indices, suitable for applications in the infrared and visible regions, and enables high-precision mass production using photolithography.
Implementation Method 1
a plurality of minute resonators each of which is formed of a conductor having a width approximately same as or smaller than a wavelength of the illumination light
Implementation Method 2
a protective film which is formed of an insulator or a semi-conductor, wherein each of the minute resonators is covered by the protective film
Data Source
AI summary
An optical member to be arranged in an optical path of a light, includes an optical medium made of an insulator or a semiconductor; a first element provided at a first position in the optical medium and made of a first electric conductor having a width approximately same as or smaller than a wavelength of the light, the first position being a position in the optical path; and a second element provided at a second position, in the optical medium, different from the first position, and made of a second electric conductor having a width approximately same as or smaller than the wavelength of the light, the second position being a position in the optical path.