Analytical Device Filter Architecture for Single Molecule Sequencing
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Solution Overview
Problem
Analytical systems face challenges in increasing sensitivity while maintaining a high signal-to-noise ratio, particularly at cellular or single molecular levels, where minor reactions can be obscured by noise, and there is a need for improved throughput, reduced size and complexity, and flexible, scalable configurations.
Innovation Solution
An analytical device with an array of reaction regions producing multiple optical signals, utilizing detectors with pixel subsets and filters that allow a significant fraction of light to pass through, enabling the detection of multiple reactive species while minimizing signal loss, and integrated with an illumination system for nucleic acid sequencing applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional filters are used to detect multiple optical signals, then signal separation is achieved, but signal loss increases and detection sensitivity decreases
Solution Approach 1:
The detector is divided into multiple pixel subsets, with each subset dedicated to detecting a specific optical signal wavelength. This segmentation allows simultaneous detection of multiple signals without using traditional filters that would block most light, thereby reducing signal loss while maintaining detection precision
Solution Approach 2:
The patent transitions from spectral dimension separation (using filters) to spatial dimension separation (using pixel subsets). By assigning different wavelength detections to different spatial locations on the detector, the system achieves signal separation without the energy loss inherent in filter-based approaches
2Measurement precision
If sensitivity is increased to detect single molecular levels, then detection capability improves, but noise level increases and signal-to-noise ratio deteriorates
Solution Approach 1:
By segmenting the detector into specialized pixel subsets for different wavelengths, the system can selectively detect specific molecular signals while ignoring noise at other wavelengths. This enhances sensitivity to target molecules while maintaining signal-to-noise ratio through wavelength-specific detection
Solution Approach 2:
Each pixel subset is optimized for detecting specific wavelength ranges corresponding to particular molecular signatures. This local optimization allows the system to achieve high sensitivity for target detection while filtering out noise through wavelength discrimination
3Measurement precision
If traditional filter systems are used for multi-signal detection, then signal separation is achieved, but device complexity and size increase
Solution Approach 1:
The patent merges the functions of multiple filters and multiple detectors into a single detector with spatially separated pixel subsets. This consolidation eliminates the need for complex filter assemblies and multiple detector components, reducing device complexity while maintaining signal separation capability
Solution Approach 2:
The system replaces complex spectral filtering with simpler spatial encoding on the detector surface. By mapping wavelength information to spatial positions, the patent achieves signal separation using the detector's inherent spatial resolution rather than requiring additional optical filtering components
4Productivity
If conventional detection methods are used, then current throughput is maintained, but scalability and flexibility are limited
Solution Approach 1:
The pixel subset architecture provides a universal detection platform that can simultaneously monitor multiple wavelengths and reaction types. By configuring different pixel subsets for different wavelength ranges, the system can adapt to various analytical applications without requiring hardware changes, enhancing both throughput and scalability
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
Enhances signal detection efficiency, reduces system complexity and size, and improves scalability, allowing for more accurate monitoring of reactions with higher photon capture rates, particularly in single molecule sequencing and binding assays.
Implementation Method 1
each of the N pixel subsets has a different filter that permits a fraction of greater than 1/N of light from the optical signals impinging upon the filter to pass through to the pixel subset
Implementation Method 2
one or more detectors positioned in optical communication with the array of reaction regions for receiving the N distinct optical signals from each reaction region
Data Source
AI summary
An approach to the design of the set of filters which allows for the collection of a larger portion of the optical signal while still distinguishing the presence of the various fluorophores is described. In some embodiments, the filter sets of the invention each block a smaller portion of the spectrum, allowing for a larger portion of the emitted light to be detected. The combined information from the light passing through two or more of the filters is then used to determine the presence of a given fluorophore. The filter sets of the invention can be particularly useful in integrated devices in which the light from a single molecule reaction in a small reaction region is directed to a detector or to a specific portion of a detector.