Optical Modulator Using Surface Plasmon Refraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge lies in manufacturing optical integrated circuits with high density due to the limitations imposed by light diffraction, making it difficult to reduce the size of optical devices below the wavelength of the used light, which restricts the miniaturization of optical devices and integrated circuits.
Innovation Solution
An optical modulator is designed using a dielectric layer and a metal layer where surface plasmon generation occurs, allowing light of different frequencies to exit at distinct refractive angles, enabling the adjustment of refractive angles based on the thickness and width of the metal layer, and facilitating the classification of light beams by refracting them at different angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional optical devices are used, then light processing function is achieved, but device size cannot be reduced below the wavelength of used light due to light diffraction limitation
Solution Approach 1:
The patent changes the fundamental operating parameters of optical devices by introducing surface plasmon resonance phenomena, which operate at the nanoscale rather than the diffraction-limited scale. This allows optical functionality to be achieved at dimensions below the wavelength of light, directly resolving the size limitation imposed by conventional optical diffraction
Solution Approach 2:
The patent replaces conventional mechanical/optical waveguide structures with surface plasmon polariton-based structures. This substitution enables light confinement and manipulation at the nanoscale level, overcoming the diffraction limitation that constrains traditional optical device sizing
2Quantity of substance
If optical device size is reduced to achieve high density integration, then integration density is improved, but manufacturing precision requirements increase due to nanoscale dimensions
Solution Approach 1:
The patent utilizes surface plasmon resonance, which is highly sensitive to nanoscale geometric parameters. By designing metal layer thickness and width at specific nanoscale dimensions (e.g., thickness ≥50 nm, width ≤1 μm), the device achieves both high integration density and manufacturability through standard semiconductor fabrication techniques
Solution Approach 2:
The patent employs localized surface plasmon resonance in specifically designed metal layer regions with controlled thickness and width. This local quality control allows precise manipulation of light at nanoscale dimensions while maintaining compatibility with existing manufacturing capabilities, balancing integration density with manufacturing precision
3Adaptability or versatility
If surface plasmon generation is used to refract light at different angles, then light classification capability is improved, but device structure complexity increases due to metal and dielectric layer configuration
Solution Approach 1:
The patent achieves light classification by varying the refractive angle based on wavelength through surface plasmon resonance. By adjusting metal layer parameters (thickness ≥50 nm, width ≤1 μm) and dielectric layer properties, different wavelengths are refracted at different angles, providing versatile light classification capability while maintaining a relatively simple layered structure
Solution Approach 2:
The patent designs the metal layer with specific geometric parameters that enable multiple functions: wavelength-dependent refraction for light classification, surface plasmon generation for enhanced light-matter interaction, and angular separation for spatial multiplexing. This multi-functionality reduces the need for separate components, thereby managing device complexity while improving adaptability
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 solution allows for the efficient classification and modulation of light beams across a wide angular range, enabling the creation of high-density optical integrated circuits by refracting light at different angles, thus overcoming the size limitations imposed by light diffraction.
Implementation Method 1
a first light of a first frequency and a second light of a second frequency that are incident upon the metal layer exit from the metal layer at different refractive angles due to surface plasmon generation
Data Source
AI summary
An optical modulator includes a dielectric layer and a metal layer arranged on the dielectric layer. In the optical modulator, a first light of a first frequency and a second light of a second frequency that are incident upon the metal layer exit from the metal layer at different refractive angles due to surface plasmon generation.