Gradient-Index Grating Layer for Broader Waveband Diffraction
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Solution Overview
Problem
Conventional diffraction gratings are wavelength-sensitive, limiting their efficiency to a specific range of wavelengths, and their diffraction efficiency is inadequate for broader applications.
Innovation Solution
The grating structures are designed with a varying refractive index to enhance diffraction efficiency and expand the operational waveband by controlling the refractive index gradient during deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional diffraction grating with uniform structure is used, then the manufacturing process is simple, but the diffraction efficiency is inadequate and wavelength sensitivity is high
Solution Approach 1:
The patent applies local quality by creating a refractive index gradient within the grating structure, where different regions of the grating have different refractive indices. This is achieved by controlling the deposition process to vary the refractive index from the bottom to the top of the grating layer, allowing each region to contribute differently to the diffraction process, thereby improving overall diffraction efficiency and bandwidth without requiring complex external systems
Solution Approach 2:
The patent implements parameter changes by systematically varying the refractive index parameter throughout the grating structure. By controlling deposition conditions such as temperature, pressure, or material composition during the deposition process, the refractive index is gradually changed from one region to another, enabling the grating to operate efficiently across multiple wavelengths while maintaining a relatively simple overall structure
2Adaptability or versatility
If a conventional diffraction grating is used, then the device structure is simple, but the operational waveband is limited
Solution Approach 1:
The patent applies local quality by creating a refractive index gradient within the grating structure, where different regions of the grating have different refractive indices. This is achieved by controlling the deposition process to vary the refractive index from the bottom to the top of the grating layer, allowing each region to contribute differently to the diffraction process, thereby improving overall diffraction efficiency and bandwidth without requiring complex external systems
Solution Approach 2:
The patent achieves universality by designing a grating structure that can operate across multiple wavelength bands simultaneously. The refractive index gradient enables the same grating structure to diffract light at different wavelengths into different orders, making the device versatile for various applications without requiring multiple specialized gratings
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 grating device with a varying refractive index achieves improved diffraction efficiency and operates efficiently across a broader range of wavelengths, reducing sensitivity to waveband selection.
Implementation Method 1
depositing a grating material on the substrate to form a grating material layer on the substrate
Implementation Method 2
A diffraction grating is a repetitive array of objects, either apertures or opaque constructions, which produce periodic changes to the phase and/or amplitude of an optical wave that emerges from the grating
Data Source
AI summary
A method forming a grating device includes: providing a substrate; entering the substrate into a process chamber; and depositing a grating material on the substrate to form a grating material layer on the substrate. A refractive index of the grating material gradually changes during depositing the grating material in the process chamber. The grating material layer includes a varying refractive index.