Half-VCSEL HCG Si Submount Integration for Tunable Lasing

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Solution Overview

Problem

Current technologies face challenges in achieving efficient integration of a half-VCSEL with a top mirror and heterogeneous integration of a half-VCSEL to a Si sub mount, particularly in terms of lasing and tunability, while also requiring improved thermal management and current injection.

Innovation Solution

The proposed solution involves the integration of a detector under a High Contrast Grating (HCG) mirror, along with the heterogeneous integration of a half-VCSEL to a Si sub mount using MEMS technology, which allows for optimized laser parameters and enhanced optical and electrical confinement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If heterogeneous integration of half-VCSEL to Si sub mount is implemented, then thermal management is improved, but device complexity increases

Engineering Contradiction:

Improvethermal managementVSAvoidintegration complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The VCSEL structure is divided into two separate components: a half-VCSEL chip containing the active region and bottom DBR, and a separate Si submount containing the top DBR and HCG mirror. This segmentation allows independent optimization of thermal management (handled by the Si submount) and lasing functionality (handled by the half-VCSEL), resolving the contradiction between improved thermal management and reduced device complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A bonding interface is introduced as an intermediary between the half-VCSEL and Si submount. This bonding layer facilitates heterogeneous integration while providing a standardized interface that simplifies the overall integration process, allowing thermal management benefits to be achieved without proportionally increasing device complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If HCG mirror is used for optical confinement, then lasing efficiency is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvelasing efficiencyVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The HCG mirror is integrated into the Si submount as a separate component rather than being monolithically grown with the VCSEL. This segmentation allows the HCG mirror to be manufactured using standard semiconductor fabrication processes on Si, which is more成熟 and scalable, thereby improving lasing efficiency without proportionally increasing manufacturing complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The HCG mirror structure parameters (grating period, depth, fill factor) are optimized to achieve high optical confinement efficiency. By carefully controlling these parameters during fabrication, the system achieves improved lasing efficiency while maintaining compatibility with existing manufacturing processes, thus not significantly increasing manufacturing complexity.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If detector is integrated under HCG, then tunability is improved, but device complexity increases

Engineering Contradiction:

ImprovetunabilityVSAvoidintegration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The detector is merged with the HCG mirror structure by integrating it into the Si submount beneath the HCG. This combination allows the detector to benefit from the optical field enhancement provided by the HCG structure while sharing the same physical platform, thereby improving tunability capabilities without proportionally increasing device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The Si submount is designed to serve multiple functions: providing mechanical support, enabling thermal management, hosting the HCG mirror for optical confinement, and integrating the detector for wavelength detection. This multi-functionality approach improves tunability through detector integration while avoiding the need for separate components, thus not significantly increasing overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 approach enables improved thermal management, current injection, and optical confinement, leading to enhanced performance in terms of tunability and lasing efficiency, while also simplifying the manufacturing process.

Implementation Method 1

integration of a detector under a High Contrast Grating (HCG) mirror, along with the heterogeneous integration of a half-VCSEL to a Si sub mount using MEMS technology, which allows for optimized laser parameters and enhanced optical and electrical confinement

Methodology Applied

Scientific EffectOptical resonance: Resonance