Interferometric Detection Method Using Dual Optical Power Quotient
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Solution Overview
Problem
Current interferometric detection methods in biosensors face limitations in sensitivity and complexity due to the need for dispersive elements and limited resolution in wavelength or incident angle, making it challenging to detect small changes in refractive index caused by biological material accumulation.
Innovation Solution
The method involves taking two interferometric measurements, one as a reference and another on a modified observation region, to construct a transduction function that converts changes in wavelength or incident angle into a unique detection variable, eliminating the need for dispersive elements and allowing for infinite resolution, thereby enhancing sensitivity and detection limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dispersive elements are used in wavelength or incident angle, then interferometric measurements can be performed, but the resolution is limited and the device complexity increases
Solution Approach 1:
The patent removes dispersive elements (gratings, prisms) from the interferometric system. Instead of using these external components to separate wavelengths, the invention extracts the wavelength discrimination function into the interferometric measurement process itself, where different wavelengths naturally produce different interference patterns that can be distinguished through computational analysis of the intensity functions.
Solution Approach 2:
The patent replaces the mechanical/optical dispersive system with a computational approach. Rather than physically separating wavelengths using gratings or prisms, the system uses digital processing of interferometric intensity functions to achieve wavelength resolution, substituting a mechanical/optical system with an information-processing system.
2Measurement precision
If a single interferometric measurement is performed, then the measurement process is simple, but the sensitivity and detection limit are insufficient
Solution Approach 1:
The patent divides the detection process into two distinct measurement segments: a reference interferometric measurement taken before sample introduction, and a second interferometric measurement taken after sample introduction. This segmentation allows the system to compare baseline conditions with post-binding conditions, significantly improving detection sensitivity while maintaining manageable complexity through systematic data processing.
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 improves sensitivity and reduces the limit of detection by eliminating resolution-dependent uncertainty, simplifying the measurement process, and reducing the complexity of the optical reading mechanism, enabling the detection of small changes with high accuracy.
Implementation Method 1
The operating principle of the interferometer consists of one of the beams interacting with the observation region such that the presence of surface elements in the observation region, for example, modifies the trajectory traveled by said beam
Data Source
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AI summary
The present invention is an interferometric detection method which allows improving the limit of detection and taking interferometric measurements with a high degree of sensitivity. The invention is characterized by the use of two interferometric measurements, a first reference measurement of an integrated optical power Pref in a wavelength range and a second measurement of an integrated optical power Pout in the same wavelength range on the observation region, in which it is to be determined whether or not there are changes, where the quotient Pout/Pref is established as a measurement parameter for determining the change experienced in the observation region with a high degree of sensitivity.