Photonic Crystal Light Emitter Structure for Optical Confinement
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Solution Overview
Problem
Existing light emitting devices using photonic crystals struggle to control the position of light propagation layers, leading to inconsistent optical confinement factors and reduced performance.
Innovation Solution
The light emitting device incorporates a laminated structure with columnar parts having specific diametrical size variations along their length, allowing for controlled refractive index distribution and improved optical confinement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between columnar parts is increased, then the space between columnar parts can be filled with light propagation layer, but air gap fails to be formed
Solution Approach 1:
The invention applies local quality by creating different diametrical sizes at different positions within the columnar part. The columnar part has a larger diametrical size at the light emitting layer and smaller diametrical sizes at the semiconductor layers, creating localized variations in refractive index distribution. This allows precise control of light propagation paths and air gap formation in specific regions without affecting the entire columnar structure.
2Volume of moving object
If the distance between columnar parts is decreased, then the space between active layers can be filled with light propagation layer, but optical confinement factor fails to be improved
Solution Approach 1:
The invention applies parameter changes by systematically varying the diametrical size parameter along the laminating direction of the columnar part. The diametrical size is changed from larger at the light emitting layer to smaller at the semiconductor layers, creating a gradient refractive index distribution. This parameter variation enables simultaneous achievement of proper light propagation layer filling and improved optical confinement factor.
3Ease of manufacture
If uniform diametrical size is used throughout columnar part, then manufacturing is simplified, but optical confinement factor cannot be optimized
Solution Approach 1:
The invention applies segmentation by dividing the columnar part into multiple sections with different diametrical sizes along the laminating direction. The columnar part is segmented into a light emitting layer portion with larger diametrical size and semiconductor layer portions with smaller diametrical sizes. This segmentation allows independent optimization of optical properties in different regions while maintaining a structured fabrication approach.
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 configuration enhances the optical confinement factor, reduces the oscillator threshold value, and allows for easier adjustment of the average refractive index, leading to improved performance and efficiency in light emission.
Implementation Method 1
In a laser due to a photonic crystal using a column crystal, the photonic crystal effect is developed making use of a difference in refractive index between a columnar part and a space between the columnar parts.
Implementation Method 2
the photonic crystal effect is developed making use of a difference in refractive index between a columnar part and a space between the columnar parts
Data Source
AI summary
In a light emitting device, a first diametrical size that is the largest size of a columnar part between a substrate side of a light emitting layer and an opposite side of the substrate, the columnar part has a size no larger than the first diametrical size in an area between the substrate side of the light emitting layer and the substrate side of a first semiconductor layer, the columnar part has a size smaller than the first diametrical size in the area between the substrate side of the light emitting layer and the substrate side of the first semiconductor layer, the columnar part has a size no larger than the first diametrical size in an area between the opposite side to the substrate of the light emitting layer, and an opposite side to the substrate of a second semiconductor layer, and the columnar part has a size smaller than the first diametrical size in the area between the opposite side to the substrate of the light emitting layer in the laminating direction, and the opposite side to the substrate of the second semiconductor layer.