Photodetector Charge Segregation for Photon Timing Precision
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Solution Overview
Problem
Existing integrated photodetectors lack the capability to accurately measure the timing of incident photons with high resolution, which is essential for applications like molecular detection and sequencing.
Innovation Solution
The integrated circuit incorporates a photodetection region, a charge carrier storage region, and a charge carrier segregation structure that directs charge carriers into either a rejection region or the storage region based on their generation time, allowing for variable timing of detection and rejection periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single fixed detection period is used in existing integrated photodetectors, then the device structure remains simple, but the measurement precision of photon arrival timing is insufficient
Solution Approach 1:
The patent implements dynamic detection periods by programming the charge carrier segregation structure to vary the detection period length. This allows the system to adapt the detection window based on expected photon arrival patterns, improving timing measurement precision without requiring multiple fixed detection structures. The detection period can be adjusted from single to multiple cycles of the reference signal, enabling flexible optimization for different measurement scenarios.
Solution Approach 2:
The patent changes the temporal parameter of the detection period by using a charge carrier segregation structure that can be programmed to define different detection period lengths. Instead of using multiple parallel detectors with fixed different detection periods, the system varies the detection period parameter dynamically, achieving improved measurement precision while maintaining a single detector architecture.
2Measurement precision
If multiple charge carrier storage regions with fixed detection periods are used, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The single charge carrier storage region is designed to serve multiple measurement functions by accepting different detection period configurations from the charge carrier segregation structure. This universal storage region can accumulate charge carriers for various detection period lengths (single period, multiple periods) without requiring separate dedicated storage regions for each measurement mode, thereby reducing overall device complexity while maintaining high measurement precision.
Solution Approach 2:
The patent merges the functionality of multiple fixed detection period storage regions into a single programmable storage region. Instead of having separate charge carrier storage regions for different detection periods, the system combines all detection period configurations into one unified storage region that is selectively filled based on the programmed detection period, simplifying the overall device architecture.
3Adaptability or versatility
If a fixed rejection period is used, then the device operation is simple, but the adaptability to different detection scenarios is limited
Solution Approach 1:
The charge carrier segregation structure is designed with programmable timing control that allows dynamic adjustment of both detection and rejection periods. This enables the system to adapt to different detection scenarios by modifying the timing parameters, such as extending the detection period for weak signals or reducing it for strong signals, while maintaining ease of operation through automated programming interfaces.
Solution Approach 2:
The system uses periodic reference signals to define the timing structure for both detection and rejection periods. By basing the timing control on periodic actions rather than fixed absolute times, the system achieves high adaptability to different scenarios while maintaining simple operation through phase-based control. The periodic nature allows flexible adjustment of detection window positions and durations without complex recalibration.
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 solution enables accurate time-domain analysis of photon arrival times, facilitating the identification and sequencing of molecules based on luminance lifetimes, and improving the resolution and accuracy of light detection in various applications.
Implementation Method 1
a photodetection region configured to receive incident photons, the photodetection region being configured to produce a plurality of charge carriers in response to the incident photons
Data Source
AI summary
An integrated circuit includes a photodetection region configured to receive incident photons. The photodetection region is configured to produce a plurality of charge carriers in response to the incident photons. The integrated circuit includes a charge carrier storage region. The integrated circuit also includes a charge carrier segregation structure configured to selectively direct charge carriers of the plurality of charge carriers directly into the at least one charge carrier storage region based upon times at which the charge carriers are produced.