Liquid Core Photonic Crystal Fiber Biosensor SERS Signal Amplification
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Solution Overview
Problem
Current photonic crystal fiber biosensors face limitations in sensitivity due to small numbers of SERS substrate particles, leading to high laser intensities and long integration times, and are costly with wavelength-sensitive nature, limiting their application and sensitivity.
Innovation Solution
A photonic crystal fiber with a double-substrate 'sandwich' structure, where silver nanoparticles are coated on the inner wall and in the solution, enhancing the electromagnetic field and interaction volume, significantly increasing the surface-enhanced Raman scattering (SERS) signal, thereby improving sensitivity and enabling in vivo and in vitro detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional photonic crystal fiber biosensors use a small number of SERS substrate particles, then the device complexity is reduced, but the sensitivity deteriorates due to weak SERS signal
Solution Approach 1:
The patent combines multiple SERS substrate particles into aggregates within the liquid core of the photonic crystal fiber. This merging of particles creates a collective SERS active region that enhances the overall signal strength while maintaining a compact structure, thereby improving sensitivity without proportionally increasing device complexity
Solution Approach 2:
The patent changes the physical state of the SERS substrate from individual dispersed particles to aggregated particles within the liquid core. This parameter change in particle arrangement and concentration enhances the electromagnetic field interaction and SERS signal intensity, resolving the sensitivity issue
2Measurement precision
If conventional photonic crystal fiber biosensors use high laser intensities to compensate for weak SERS signal, then the measurement precision improves, but the use of energy increases and may cause damage
Solution Approach 1:
The patent creates multiple SERS active sites through particle aggregation within the liquid core, effectively copying the SERS function across multiple particles. This distributed SERS activity accumulates signal strength, allowing detection at lower laser intensities while maintaining sensitivity
Solution Approach 2:
By merging multiple SERS particles into aggregates in the liquid core, the patent combines their individual SERS signals constructively. This signal addition effect enables detection with reduced laser intensity, as the collective response of the particle aggregate provides sufficient signal strength
3Measurement precision
If conventional photonic crystal fiber biosensors use long integration times to improve signal strength, then the measurement precision improves, but the productivity decreases due to slow detection speed
Solution Approach 1:
The patent merges multiple SERS particles into aggregates that provide simultaneous signal generation throughout the liquid core. This parallel signal production eliminates the need for sequential accumulation over time, enabling fast detection with strong signals and thereby improving productivity without sacrificing measurement precision
4Manufacturing precision
If conventional photonic crystal fiber biosensors use wavelength-sensitive structures, then the manufacturing precision can be maintained, but the adaptability deteriorates due to limited application range
Solution Approach 1:
The patent creates a universal sensing platform by filling the liquid core with SERS-active particle aggregates that can detect multiple analytes. This multi-functional approach allows the same fiber structure to detect different molecules and perform various sensing applications, greatly enhancing adaptability while maintaining manufacturing precision
Solution Approach 2:
The patent changes the optical properties of the fiber core by introducing particles with broad spectral absorption characteristics. This parameter change in the core material composition enables the fiber to operate across multiple wavelengths and detect diverse analytes, resolving the adaptability limitation
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
The enhanced SERS signal amplifies molecular information by up to 1015 times, achieving sensitivity 10-100 times better than regular fibers, making it suitable for medical, environmental, and industrial applications with reduced detection times and costs.
Implementation Method 1
Surface enhanced Raman scattering provides the fingerprint of the analyte molecules and enlarges or amplifies the signal by up to at least 10^15 times that of regular Raman signals
Implementation Method 2
confinement of both light and sample in the central core of the LCPCF and thereby increased interaction volume
Implementation Method 3
both the photonic bandgap guiding and the index guiding mechanisms
Implementation Method 4
significant enhancement of the local electromagnetic field of the nanoparticle aggregate that strongly absorbs the incident excitation light for the Raman scattering process
Data Source
AI summary
The invention is drawn to a photonic crystal fiber that can be used with nanoparticles to detect and quantify components in a test sample. The invention further relates to methods of using the photonic crystal fiber for detecting chemical and biological analytes, and in use in optical communications.