Waveguide-Based Optical Scanning for Bio-Analysis
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Solution Overview
Problem
Current optical bio-analysis methods, such as microarray fluorescence scanning and waveguide-based biosensors, face limitations including short interaction length between bio-samples and light, high noise levels, sensitivity to planarity and position, slow operation, and complex, expensive systems, which hinder their efficiency and accuracy in detecting biologically active analytes.
Innovation Solution
A scanning sensor system featuring a substrate with substantially parallel waveguides for guiding excitation and emitted light, coupled with an adapter for optical communication between a light source and detector, enabling efficient light distribution and collection across multiple optical sensing sites, thereby enhancing signal strength and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If confocal scanning systems are used for microarray fluorescence scanning, then sensitivity and signal-to-noise ratio are improved, but the interaction length between bio-sample and light is limited to a single mono-layer, reducing signal strength
Solution Approach 1:
The patent transitions from single-layer surface scanning to multi-layer volumetric sensing by introducing waveguide structures that extend the optical interaction into the depth dimension. The waveguides enable light to penetrate and interact with multiple layers of bio-samples stacked vertically, converting a 2D surface measurement into a 3D volumetric measurement, thereby increasing interaction length while maintaining measurement precision.
Solution Approach 2:
The patent implements a nested structure where multiple sensing layers are stacked within a single substrate, with each layer containing bio-samples at different depths. The waveguide structure nests these layers sequentially, allowing the optical beam to traverse through multiple nested layers, effectively increasing the total interaction length without requiring a larger lateral scanning area.
2Measurement precision
If confocal scanning systems with single photo-multiplier detector are used, then signal detection is achieved, but high background noise occurs due to back reflected light and emitted fluorescent light traveling in the same direction
Solution Approach 1:
The patent inverts the detection geometry by using waveguides to collect emitted fluorescent light from the side rather than from the top. This spatial inversion separates the collection path of emitted light from the path of back-reflected light, allowing the detector to receive signal primarily from fluorescence emission while minimizing contamination from reflected excitation light, thereby reducing background noise while maintaining detection capability.
Solution Approach 2:
The waveguide structure acts as an intermediary that selectively couples emitted fluorescent light to the detector while blocking or redirecting back-reflected light. The waveguide's optical properties serve as a filtering mechanism, allowing only the desired fluorescence signal to propagate to the detector, effectively mediating between the bio-sample and detector to reduce harmful background noise.
3Measurement precision
If large number of pixels are scanned within every sample, then comprehensive analysis is achieved, but operation speed decreases due to long integration time required
Solution Approach 1:
The patent merges multiple sensing layers into a single integrated substrate structure, allowing simultaneous excitation and detection across all layers. This consolidation enables parallel processing of multiple samples that would otherwise require sequential scanning, significantly increasing operation speed while maintaining comprehensive analysis capability through the multi-layer architecture.
Solution Approach 2:
The waveguide structure enables continuous light propagation through multiple layers without requiring the beam to be repositioned or re-focused between layers. This continuous optical path eliminates dead time between measurements and allows uninterrupted data collection across all sensing layers, maintaining high productivity while achieving comprehensive multi-layer analysis.
4Measurement precision
If conventional optical scanning systems are used, then bio-sample analysis is performed, but complicated optical and mechanical structure results in bulky and expensive systems
Solution Approach 1:
The patent replaces complex mechanical scanning components with an integrated waveguide-based optical system. Instead of using mechanical stages to physically move the sample or detector through multiple layers, the waveguides provide fixed optical paths that guide light through stacked sensing layers. This substitution eliminates bulky mechanical positioning systems while maintaining the ability to analyze multiple layers, reducing device complexity and size.
Solution Approach 2:
The waveguide substrate serves multiple functions simultaneously: it provides structural support for stacking sensing layers, guides excitation light to all layers, collects emitted fluorescence from all layers, and positions the sensing elements in precise three-dimensional arrays. This multi-functionality consolidates what would otherwise require separate components, simplifying the overall system structure while maintaining comprehensive bio-sample analysis capability.
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 configuration improves signal-to-noise ratio, increases sensitivity, and reduces operational complexity, allowing for faster and more accurate detection of biologically active analytes across a large number of sensing sites with improved system efficiency.
Implementation Method 1
The substrate includes a plurality of substantially parallel waveguides for guiding the excitation light to the sensing sites and for collecting the emitted light from the sensing sites
Data Source
AI summary
A scanning sensor system, methods of use and kits for detecting a biologically active analyte are provided. The scanning sensor system includes a light source, a detector, a substrate comprising a plurality of waveguides and a plurality of optical sensing sites in optical communication with one or more waveguide of the substrate, and at least one adapter configured to couple with the substrate and provide optical communication between the light source, the waveguides of the substrate, and the detector.