Dovetail Ridge Waveguide Planarization for Low-Capacitance Lasers
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Solution Overview
Problem
Existing semiconductor lasers face challenges in heat dissipation and capacitance at high frequencies, particularly at elevated temperatures, which affect high-speed performance and are exacerbated by the use of Buried-Heterostructure (BH) technology that introduces defects and costs.
Innovation Solution
A semiconductor laser structure with a dovetail ridge waveguide and a planarization process using materials like MgO, MgF2, or SiO2 with low dielectric constant, deposited through electron beam evaporation, to improve thermal conductivity and reduce capacitance, while maintaining stable device characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If Buried-Heterostructure (BH) technology is used to spread heat away from the active region, then heat dissipation is improved, but device complexity and manufacturing cost increase due to etching through the active region and regrowing high thermal conductivity thin films
Solution Approach 1:
The patent extracts the heat dissipation function from the complex BH structure by applying planarization materials directly to the waveguide surfaces. This removes the need for etching through the active region and regrowing thin films, while still achieving effective heat spreading from the active region through the deposited materials with low dielectric constants.
Solution Approach 2:
The patent uses inexpensive planarization materials (such as silicon oxide, silicon nitride, or polymer materials) that can be deposited through simple processes like electron beam evaporation or chemical vapor deposition. These materials replace the expensive and time-consuming BH regrowth process, providing cost-effective heat dissipation without requiring complex fabrication steps.
2Temperature
If Buried-Heterostructure (BH) technology is used to spread heat away from the active region, then heat dissipation is improved, but manufacturing cost increases due to additional regrowth processes
Solution Approach 1:
The patent uses inexpensive planarization materials (such as silicon oxide, silicon nitride, or polymer materials) that can be deposited through simple processes like electron beam evaporation or chemical vapor deposition. These materials replace the expensive and time-consuming BH regrowth process, providing cost-effective heat dissipation without requiring complex fabrication steps.
Solution Approach 2:
The patent extracts the heat dissipation function from the complex BH structure by applying planarization materials directly to the waveguide surfaces. This removes the need for etching through the active region and regrowing thin films, while still achieving effective heat spreading from the active region through the deposited materials with low dielectric constants.
3Temperature
If conventional mounting methods are used with substrate in contact with thermally conductive material, then heat removal is achieved, but device structure becomes more complex and capacitance increases at high frequencies
Solution Approach 1:
The patent makes the waveguide structure multi-functional by selecting materials with low dielectric constants that simultaneously provide both optical waveguiding and thermal conduction. This eliminates the need for separate thermally conductive mounting structures, as the waveguide itself performs both light confinement and heat removal functions, thereby reducing overall device complexity.
Solution Approach 2:
The patent merges the thermal management function with the optical waveguide structure by depositing low dielectric constant materials directly on the waveguide surfaces. This combines the previously separate functions of optical confinement and heat dissipation into a single integrated structure, reducing capacitance and simplifying the device architecture.
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 planarization process enhances heat dissipation and reduces capacitance, improving high-speed performance and stability of semiconductor lasers at elevated temperatures without the need for expensive BH technology.
Implementation Method 1
The planarization process enhances heat dissipation and reduces capacitance, improving high-speed performance and stability of semiconductor lasers at elevated temperatures
Implementation Method 2
A semiconductor laser structure with a dovetail ridge waveguide and a planarization process using materials like MgO, MgF2, or SiO2 with low dielectric constant
Implementation Method 3
deposited through electron beam evaporation
Data Source
AI summary
A laser structure may include a substrate, an active region arranged on the substrate, and a waveguide arranged on the active region. The waveguide may include a first surface and a second surface that join to form a first angle relative to the active region. A material may be deposited on the first surface and the second surface of the waveguide.