Nanocolumn Light Emitter Layout for Linear Polarization
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Solution Overview
Problem
Semiconductor lasers using GaN-based nanocolumns face challenges in achieving linearly polarized light emission due to the arrangement of nanocolumns in lattice patterns with rotational symmetry, which hinders efficient light emission and increases defects, making it difficult to achieve high power light emission, especially in the red region.
Innovation Solution
A light emitting apparatus with a laminated structure comprising columnar sections where the ratio of maximum to minimum width of the light emitting layer in some columnar sections is greater than in others, breaking rotational symmetry, allowing for linearly polarized light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If nanocolumns are arranged in a lattice pattern with rotational symmetry, then the structure provides photonic crystal effects for high power light emission, but the emitted light is not linearly polarized
Solution Approach 1:
The patent applies asymmetry by arranging nanocolumns in a rectangular lattice pattern rather than a rotationally symmetric pattern. This asymmetric arrangement breaks the rotational symmetry while maintaining the photonic crystal effect, enabling both high power emission and linear polarization of the emitted light.
2Measurement precision
If nanocolumn diameter is increased to achieve red region laser oscillation, then the wavelength requirement is met, but the nanocolumn effects of defect reduction and light emission efficiency increase are compromised
Solution Approach 1:
The patent applies segmentation by dividing the nanocolumn structure into multiple smaller nanocolumns arranged in assemblies. Each nanocolumn maintains a small diameter for high light emission efficiency and low defects, while the collective assembly of multiple nanocolumns achieves the required red region wavelength through their periodic arrangement.
Solution Approach 2:
The patent combines multiple small-diameter nanocolumns into nanocolumn assemblies that function collectively. By merging several nanocolumns in a periodic rectangular arrangement, the structure achieves the effective wavelength characteristics of larger nanocolumns while preserving the advantages of smaller individual nanocolumns regarding efficiency and defect reduction.
3Device complexity
If nanocolumn assemblies are arranged in a rotationally symmetric lattice pattern, then the structure is simplified, but linearly polarized light emission cannot be achieved
Solution Approach 1:
The patent replaces rotationally symmetric lattice patterns with asymmetric rectangular lattice patterns. This asymmetric arrangement is simple to implement while effectively enabling linearly polarized light emission by breaking the rotational symmetry that prevents polarization.
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 apparatus achieves linearly polarized light emission, enhancing light emission efficiency and reducing defects, making it suitable for use in projectors and other applications requiring high-quality light sources.
Implementation Method 1
semiconductor lasers using nanocolumns are expected to achieve high power light emission at small radiation angles based on the photonic crystal effect provided by the nanocolumns
Data Source
AI summary
A light emitting apparatus includes a laminated structure including a plurality of columnar section assemblies each formed of p columnar sections. The p columnar sections each include a light emitting layer. When viewed in the lamination direction of the laminated structure, the ratio of the maximum width to the minimum width of the light emitting layer in each of q first columnar sections out of the p columnar sections is greater than the ratio of the light emitting layer in each of r second columnar sections out of the p columnar sections. The light emitting layer in each of the p columnar sections does not have a rotationally symmetrical shape. The parameter p is an integer greater than or equal to 2. The parameter q is an integer greater than or equal to 1 but smaller than p. The parameter r is an integer that satisfies r=p−q.