Vertically Integrated MEMS Optoelectronics Package
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Solution Overview
Problem
MEMS-based sensors face challenges in minimizing noise sources and accommodating complex electrical, mechanical, and optical connections on a decreasing footprint, requiring innovative packaging strategies to enhance performance.
Innovation Solution
A vertically integrated assembly that includes a MEMS/photonic module with a vertically emitting light source, a photonic circuit for routing optical signals, and a photodiode chip for converting optical signals into electrical signals, along with electrical circuits for routing electrons, all aligned and bonded to form a compact and robust packaging structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional packaging is used for MEMS sensors, then the device can be manufactured with standard processes, but the in-plane footprint is large and bonding strength is insufficient
Solution Approach 1:
The patent transitions from a planar packaging architecture to a three-dimensional vertically integrated architecture. Multiple functional layers (MEMS layer, photonic circuit layer, photodiode layer, electrical circuit layer) are stacked vertically, allowing complex interconnections to be routed through the vertical dimension rather than requiring large in-plane areas. This dimensional transition reduces the footprint while maintaining manufacturing feasibility through standardized vertical bonding processes.
2Adaptability or versatility
If more connections are added to accommodate complex routines, then functionality is enhanced, but noise sources increase
Solution Approach 1:
The patent segments the system into functionally independent layers: MEMS layer for sensing, photonic circuit layer for optical signal routing, photodiode layer for optical-to-electrical conversion, and electrical circuit layer for signal processing. This segmentation allows each layer to be optimized for its specific function, minimizing cross-layer interference and noise coupling while maintaining complex functionality through controlled inter-layer connections.
Solution Approach 2:
The patent introduces photonic circuits as an intermediary medium between the MEMS layer and photodiode layer. Optical signals serve as noise-immune carriers, transmitting sensing information without electrical interference. The photonic intermediary converts mechanical displacements to optical signals and then to electrical signals, isolating the sensitive MEMS element from electrical noise sources in the processing circuits.
3Area of stationary object
If footprint is reduced, then integration density increases, but bonding strength may be compromised
Solution Approach 1:
The patent distributes bonding interfaces across multiple horizontal planes in the vertical dimension, creating multiple bonding surfaces between stacked layers. This vertical distribution of bonding areas compensates for the reduced in-plane footprint, as the total bonding strength is accumulated across multiple interfaces rather than concentrated in a single large bond area.
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 reduces the in-plane footprint, increases bonding strength, and enhances manufacturability, while efficiently delivering optical signals and detecting displacement information with low noise, effectively addressing the challenges of noise reduction and footprint minimization.
Implementation Method 1
The front surface portion of the emitter module is configured to support a vertical cavity surface emitting laser (VCSEL) and to vertically deliver an optical input signal
Implementation Method 2
The photonic layer includes a photonic crystal waveguide that routes the optical signal on the MEMS/photonic chip
Implementation Method 3
an optical resonator sensor that senses displacement information of the proof mass by routing photons from the VCSEL to the optical resonator sensor
Implementation Method 4
The front surface portion of the detector module includes a photodetector that converts the optical signal into an electrical signal
Data Source
AI summary
The present application relates to vertically integrated assemblies including a MEMS-based optomechanical architecture. In some embodiments, the assembly includes a MEMS/optoelectronic module, an emitter module, and a detector module, where these modules are vertically integrated. Methods of fabricating such assemblies are also described herein.