Multilayer Dielectric Metal Grating for Tunable Wavelength Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical devices lack the flexibility to adjust the transmitted or reflected wavelength region effectively, limiting their versatility in applications such as forming colored images different from white or black.
Innovation Solution
A display body comprising an optical device with a multilayer structure including dielectric and metal layers, arranged in a specific grating configuration that allows for adjustable wavelength transmission and reflection through plasmon resonance, enabling images of different colors to be displayed based on observation conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional optical device structure is used, then the device is simple to manufacture, but the degree of freedom of adjusting the transmitted or reflected wavelength region is limited
Solution Approach 1:
The optical device is divided into multiple functional layers including dielectric layers and metal layers, each with specific optical properties. The dielectric layers and metal layers are segmented into distinct periodic structures with different periods, allowing independent optimization of each layer's contribution to the overall spectral response. This segmentation enables precise control over wavelength transmission and reflection characteristics.
Solution Approach 2:
The patent employs a composite structure combining dielectric materials and metal materials in alternating layers. This composite approach leverages the complementary optical properties of dielectrics (low absorption, high reflection at certain wavelengths) and metals (plasmon resonance, high absorption at specific frequencies) to achieve broad and tunable spectral control that neither material type could provide alone.
2Adaptability or versatility
If a multilayer structure with dielectric and metal layers is implemented, then the wavelength region can be adjusted effectively, but the manufacturing complexity increases
Solution Approach 1:
The dielectric layers and metal layers are arranged in periodic structures with different periods. This periodicity allows the use of standard photolithography and deposition techniques to create repeating patterns across the entire device area, simplifying the manufacturing process while maintaining precise control over optical properties. The periodic structures enable scalable production through replication of identical unit cells.
Solution Approach 2:
The patent controls the optical characteristics by adjusting key parameters such as the period, thickness, and material composition of each layer. By varying these parameters during the design and manufacturing stages, the transmitted and reflected wavelength regions can be tuned to match specific application requirements without fundamentally changing the overall device architecture or manufacturing process.
3Adaptability or versatility
If the optical device uses fixed wavelength transmission/reflection, then the structure is simpler, but the versatility for different applications is reduced
Solution Approach 1:
The optical device is designed with multiple dielectric layers and metal layers, each contributing different optical functions. This multi-functional structure allows a single device to perform multiple roles: filtering specific wavelength regions, reflecting unwanted wavelengths, and transmitting desired wavelengths. The device can be configured to serve different applications by adjusting the number, period, and material composition of the layers without requiring fundamentally different device architectures.
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 solution enhances the ability to adjust the wavelength region, allowing for images of different colors to be visually recognized depending on observation conditions, thereby increasing product authentication and design properties.
Implementation Method 1
arranged in a specific grating configuration that allows for adjustable wavelength transmission and reflection through plasmon resonance
Implementation Method 2
utilizes an optical interference of a diffraction grating or a multilayer film
Implementation Method 3
utilizes an optical interference of a diffraction grating or a multilayer film
Data Source
Figure 1~2
Figure 3~6
Figure 7~8
AI summary
An optical device comprises a support having a reference plane, and a dielectric periodic structure including a plurality of periodic elements which are arranged, on the reference plane, in a two-dimensional lattice having a sub-wavelength spacing and are either projections projecting from the reference plane or recesses depressed from the reference plane. The optical device further includes a metal layer, which is positioned on a surface of the periodic structure including a region of the reference plane surrounding the individual periodic elements and the surfaces of the periodic elements and which has a shape that follows the surface profile of the periodic structure.