Holed Electrode for Nano-Column Laser Oscillation Threshold
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Semiconductor lasers with nano-column structures face increased oscillation threshold values due to light absorption by the electrode, which hinders efficient light emission.
Innovation Solution
A light emitting device with columnar parts and a second electrode featuring holes that penetrate through and are smaller than the columnar parts, positioned to minimize light absorption and maximize electrical coupling, reducing the oscillation threshold by allowing light to propagate effectively through the columnar parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrode is disposed on the nano-column to form a light emitting element, then electrical coupling is achieved, but light is absorbed by the electrode causing the oscillation threshold value to rise
Solution Approach 1:
The electrode is segmented by forming holes that divide it into multiple regions, allowing light to pass through certain areas while maintaining electrical contact in other areas. This segmentation resolves the contradiction by spatially separating the light transmission path from the electrical coupling regions.
Solution Approach 2:
Different regions of the electrode have different functions: some regions (with holes) are optimized for light transmission, while other regions maintain electrical coupling. The electrode structure is locally modified to have varying properties - transparent in hole regions and conductive in solid regions - thereby resolving the contradiction between light transmission and electrical coupling requirements.
2Loss of energy
If the electrode is made transparent to reduce light absorption, then light transmission improves, but electrical coupling efficiency decreases
Solution Approach 1:
The electrode is divided into transparent regions (with holes) and conductive regions (solid parts), allowing each segment to optimize its function. The segmented structure enables the electrode to simultaneously achieve light transmission through hole regions and electrical coupling through solid regions.
Solution Approach 2:
The electrode structure is designed to perform multiple functions simultaneously: it provides electrical coupling through its conductive material while allowing light transmission through the holes. This multi-functional design resolves the contradiction by making the electrode both electrically functional and optically transparent in different locations.
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 reduces light absorption by the electrode, decreases the oscillation threshold, and ensures effective electrical coupling between the electrode and columnar parts, enhancing the light emitting device's performance.
Implementation Method 1
the columnar parts have a light emitting layer, the columnar parts are disposed between the electrode and the substrate, light generated in the light emitting layer propagates through the plurality of columnar parts to cause laser oscillation
Implementation Method 2
the semiconductor laser having a nano-structure called a nano-column, a nano-wire, a nano-rod, a nano-pillar, or the like is expected to realize a light emitting device capable of obtaining narrow radiation angle and high power light emission due to an effect of a photonic crystal
Data Source
AI summary
A light emitting device includes a substrate, a laminated structure provided to the substrate, and including a plurality of columnar parts, and an electrode disposed at an opposite side to the substrate of the laminated structure, wherein the columnar parts have a light emitting layer, the columnar parts are disposed between the electrode and the substrate, light generated in the light emitting layer propagates through the plurality of columnar parts to cause laser oscillation, and the electrode is provided with a hole.