Self-Referencing LPR Sensor Waveguide Calibration
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Solution Overview
Problem
Single fiber-optic localized plasmon resonance sensing systems lack the ability to compensate for influences caused by instrumental or environmental factors such as baseline drift, temperature changes, and sample composition, leading to nonspecific adsorption and reduced detection accuracy.
Innovation Solution
A self-referencing localized plasmon resonance sensing device and system that utilize a reference optical waveguide element and a sensing optical waveguide element, both modified with noble metal nanoparticle layers, to generate localized plasmon resonance signals. The system normalizes differences between signals from blank and sample detections using calibration slopes to isolate specific adsorption responses, thereby compensating for environmental and instrumental interferences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fiber-optic LPR sensing system is used, then the device complexity is reduced, but the measurement precision deteriorates due to inability to compensate environmental factors
Solution Approach 1:
The sensing system is segmented into two independent optical waveguide elements: a reference waveguide element and a sensing waveguide element. Each element functions independently to monitor different aspects of the environment, allowing the system to distinguish between environmental fluctuations and actual analyte binding events through differential measurement
Solution Approach 2:
The reference optical waveguide element acts as an intermediary that monitors environmental factors (temperature, pH, ionic strength) without containing recognition units. This reference signal serves as a mediator to compensate for environmental interferences in the sensing channel, enabling accurate detection despite environmental variations
2Measurement precision
If temperature control system is added to compensate environmental factors, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The reference optical waveguide element provides self-service by automatically monitoring and reporting environmental fluctuations. The system uses its own reference channel to generate compensation signals, eliminating the need for external temperature control systems or additional sensing equipment while maintaining measurement accuracy
3Measurement precision
If multiple dilutions are performed in sample preparation, then the measurement precision is improved by reducing interference, but the productivity decreases
Solution Approach 1:
The reference optical waveguide element provides real-time feedback on environmental conditions during sample measurement. This feedback mechanism allows the system to compensate for environmental interferences without requiring sample dilution or preparation modifications, enabling direct measurement of undiluted samples while maintaining accuracy
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 reduces interference from environmental factors and nonspecific adsorption, improving detection performance and reducing the need for multiple sample dilutions, thereby enhancing the detection limit and accuracy of the sensing system.
Implementation Method 1
The electron cloud on the surface of metal nanoparticles can be excited by an electromagnetic field of a specific frequency, which is resonant with the collective oscillation of the conduction electrons confined within the volume of the nanoparticles, accordingly also known as the Localized Plasmon Resonance (LPR)
Implementation Method 2
By using the effect of multiple total internal reflections along an optical waveguide, it is possible to accumulate the amount of change in the absorption of the evanescent wave due to absorption by the nanoparticle plasmon resonance
Data Source
AI summary
A self-referencing localized plasmon resonance sensing device and a system thereof are disclosed. The reference optical waveguide element is modified with a noble metal nanoparticle layer. The sensing optical waveguide element is modified with a noble metal nanoparticle layer, which is further modified with a recognition unit. The incident light is guided into the reference and the sensing optical waveguide elements to respectively generate localized plasmon resonance sensor signals. The reference and the sensing optical waveguide elements respectively have a calibration slope. The processor utilizes the calibration slopes to regulate the second difference generated by detecting with the sensing optical waveguide element. The processor utilizes a difference between the first difference, which is generated by detecting with the reference optical waveguide element, and the regulated second difference to obtain a sensor response.