Textured Reflective Surface Enhances Colorimetric Signal
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Solution Overview
Problem
In bio/chemical assays, particularly with colorimetric assays, thin samples (less than 100 um) produce faint light signals, limiting sensitivity due to reduced light absorption, making it difficult to observe and measure effectively.
Innovation Solution
A QMAX card with two movable plates, one transparent and the other with a textured reflective surface, is used to create a uniform thin sample layer, enhancing optical signals by diffusing and reflecting light, thereby increasing the color signal even for samples as thin as 30 um or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sample thickness is reduced to minimize reagent volume and enable rapid mixing, then the assay speed and ease of operation improve, but the light signal becomes faint and measurement precision deteriorates
Solution Approach 1:
The patent transitions from a simple flat sample layer to a three-dimensional textured structure with light-trapping features. The textured surface creates multiple light paths and increases the effective optical path length within the thin sample, enabling strong colorimetric signals even at 100 micrometers or less thickness.
Solution Approach 2:
The patent modifies the physical parameters of the sample interface by introducing surface texturing with specific roughness characteristics. This changes how light interacts with the sample, increasing absorption and scattering to enhance the colorimetric signal without requiring increased sample thickness.
2Measurement precision
If the sample thickness is increased to enhance light absorption and improve measurement precision, then the light signal strengthens, but the assay volume increases and mixing speed decreases
Solution Approach 1:
Instead of increasing sample thickness in one dimension, the patent creates optical path complexity in three dimensions through surface texturing. This allows maintaining thin sample geometry for rapid mixing while achieving enhanced light absorption equivalent to much thicker samples.
Solution Approach 2:
The patent changes the optical interaction parameters by introducing surface roughness and texturing, which increases light scattering and absorption efficiency. This allows achieving strong colorimetric signals with minimal sample volume and rapid mixing times.
3Ease of manufacture
If a flat sample surface is used to simplify device structure, then manufacturing precision requirements are reduced, but light signal diffusion is insufficient and measurement precision deteriorates
Solution Approach 1:
The patent specifies particular parameters for surface texturing, including roughness range (0.1-10 micrometers) and feature size (1-100 micrometers), to optimize light scattering and absorption. These controlled parameters enhance measurement precision while maintaining compatibility with standard manufacturing 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
This approach significantly enhances the color signal in thin samples, improving assay sensitivity and speed by ensuring stronger light absorption and faster measurement times, even with dry reagents mixed quickly.
Implementation Method 1
one or both plates are transparent and the other plate has a textured reflective surface, is used to create a uniform thin sample layer, enhancing optical signals by diffusing and reflecting light
Implementation Method 2
one or both plates are transparent and the other plate has a textured reflective surface, is used to create a uniform thin sample layer, enhancing optical signals by diffusing and reflecting light
Data Source
AI summary
Among other thing, the present invention provides solution to the problem, particularly, the present invention certain surfaces and certain sample holder to improve the sensitivity, speed, and easy-to-use of an optical signal based assays, such as colorimetric assays or fluorescence assays.