Photonic-Crystal Surface Laser Layout for Compact High-Coupling Emission
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Solution Overview
Problem
Reducing the size of photonic-crystal surface emitting lasers to lower power consumption while maintaining high coupling efficiency and suppressing deterioration of characteristics, as smaller sizes lead to reduced coupling efficiency and degraded performance.
Innovation Solution
A photonic-crystal surface emitting laser design featuring a photonic crystal layer with a higher refractive index than the semiconductor layer, including regions with different refractive indices periodically disposed in a plane, extending from the photonic crystal layer to the semiconductor layer, which enhances coupling efficiency and maintains performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the size of the PCSEL is reduced to lower power consumption, then power consumption is reduced, but the coupling efficiency of the photonic crystal layer is reduced and characteristics are deteriorated
Solution Approach 1:
The photonic crystal layer is designed with regions of different refractive indices (first regions and second regions with different refractive indices) periodically disposed within it. This local variation in optical properties enhances the coupling efficiency between the active layer and the photonic crystal layer, allowing the device to maintain high performance even when the overall device size is reduced.
Solution Approach 2:
The invention changes the refractive index parameter within the photonic crystal layer by introducing regions with different refractive indices. This parameter modification optimizes the coupling coefficient and allows the photonic crystal layer to effectively guide and emit light even in a reduced-size configuration, thereby maintaining characteristic performance while reducing power consumption.
2Use of energy by moving object
If the size of the PCSEL is reduced to lower power consumption, then power consumption is reduced, but the characteristics of the PCSEL are deteriorated
Solution Approach 1:
The photonic crystal layer is designed with regions of different refractive indices (first regions and second regions with different refractive indices) periodically disposed within it. This local variation in optical properties enhances the coupling efficiency between the active layer and the photonic crystal layer, allowing the device to maintain high performance even when the overall device size is reduced.
Solution Approach 2:
The invention changes the refractive index parameter within the photonic crystal layer by introducing regions with different refractive indices. This parameter modification optimizes the coupling coefficient and allows the photonic crystal layer to effectively guide and emit light even in a reduced-size configuration, thereby maintaining characteristic performance while reducing power consumption.
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 design increases the coupling coefficient of the photonic crystal layer, thereby suppressing the deterioration of characteristics and allowing for reduced size without compromising performance, enabling efficient light emission in the normal direction.
Implementation Method 1
By diffracting light in a plane of the photonic-crystal, light oscillates at a wavelength based on the period and is emitted in the normal direction of the plane
Implementation Method 2
The photonic-crystal includes a periodic structure having a refractive index different from that of the base material
Data Source
AI summary
A photonic-crystal surface emitting laser includes a first semiconductor layer, a photonic crystal layer having a refractive index higher than a refractive index of the first semiconductor layer and provided on the first semiconductor layer, and an active layer provided opposite to the first semiconductor layer with respect to the photonic crystal layer. The photonic crystal layer has a first region and a plurality of second regions each having a refractive index different from a refractive index of the first region and periodically disposed in the first region in a plane of the photonic crystal layer. The second regions extend from the photonic crystal layer to the first semiconductor layer.