Photo-Detecting Apparatus Segmented Absorption Region
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Solution Overview
Problem
Existing photodetectors face challenges in efficiently converting optical signals to electrical signals, particularly in achieving high speed and accuracy for applications such as time-of-flight measurements.
Innovation Solution
The proposed photo-detecting apparatus includes a substrate with a first material and an absorption region with a second material, supported by the substrate. The absorption region is configured to receive optical signals and generate photo-carriers, and is arranged between multiple readout electrodes electrically coupled to a same readout circuit, or between sets of switches with control and readout regions. This design enhances the collection of photo-carriers and reduces their travel distance, thereby increasing the speed of the photodetector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the absorption region is positioned closer to the readout electrodes to reduce photo-carrier travel distance, then the speed of the photodetector is improved, but the collection efficiency of photo-carriers may be compromised due to reduced absorption path length
Solution Approach 1:
The photodetector is divided into functionally independent regions: an absorption region for generating photo-carriers and separate readout electrode regions for collecting them. This segmentation allows each region to be optimized for its specific function - the absorption region can be positioned to maximize absorption path length while readout electrodes are positioned for efficient collection, resolving the contradiction between speed and collection efficiency.
Solution Approach 2:
The patent introduces intermediate structures (such as charge transfer layers or field effect regions) between the absorption region and readout electrodes. These intermediaries facilitate efficient photo-carrier collection while allowing spatial separation between the absorption and readout regions, thereby maintaining both high collection efficiency and fast response speed.
2Reliability
If multiple readout electrodes are used to improve signal collection, then the signal strength is improved, but the device complexity increases due to additional electrical connections and readout circuits
Solution Approach 1:
Multiple readout electrodes are electrically connected to a common readout circuit or shared signal processing path. This merging approach allows the system to benefit from multiple collection points while reducing the complexity of individual readout circuits, as the signals from multiple electrodes are combined and processed together.
Solution Approach 2:
The readout electrodes and their associated circuits are designed to handle multiple functions: signal collection from different regions, noise rejection through differential measurement, and time-of-flight information extraction. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby managing complexity while maintaining signal collection strength.
3Reliability
If the absorption region is made larger to increase optical signal absorption, then the absorption efficiency is improved, but the manufacturing precision becomes more difficult to control
Solution Approach 1:
The absorption region is designed with segmented or modular structures that can be fabricated using standard manufacturing processes. By dividing the large absorption region into smaller, manageable segments with well-defined boundaries, the manufacturing precision is improved while maintaining overall absorption efficiency through the cumulative effect of multiple segments.
Solution Approach 2:
The patent optimizes the absorption region dimensions and material properties to achieve high absorption efficiency within manufacturable parameter ranges. By carefully selecting absorption region thickness, lateral dimensions, and material composition, the design achieves effective optical absorption while remaining compatible with standard fabrication tolerances and processes.
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 improved speed and efficiency in converting optical signals to electrical signals, enabling accurate time-of-flight information derivation and enhancing performance in various applications.
Implementation Method 1
an absorption region configured to receive an optical signal and to generate photo-carriers in response to the optical signal
Data Source
AI summary
Methods, devices, apparatus, and systems for photo-detecting are provided. The photo-detecting apparatus includes a substrate, an absorption region supported by the substrate and configured to receive an optical signal and generate photo-carriers in response to the optical signal, and multiple sets of a switch including a first set and a second set. The substrate includes a first material, and the absorption region includes a second material. The absorption region is arranged in between the first set and the second set. Each of the multiple sets includes a respective control region and a respective readout region. The respective control regions of the multiple sets of the switch are configured to receive a control signal, and the respective readout regions of the multiple sets of the switch are configured to provide one or more electrical signals representing first collective information for deriving time-of-flight information associated with the optical signal.