Metasurface Inspection Chip for Low-Concentration Fluorescence Detection
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Solution Overview
Problem
Existing fluorescence detection methods fail to achieve high-precision detection of biomolecules at low concentrations due to inefficient immobilization and fluorescence enhancement on metasurfaces, limiting their application in medical diagnostics such as early-stage cancer detection.
Innovation Solution
A biomolecular inspection chip with a metasurface structure featuring gaps and a microresonator configuration, utilizing a first substrate with a metasurface and a second substrate with a microchannel, enhances fluorescence intensity and directs it towards the second substrate for efficient detection, even at low biomolecule concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluorescence detection methods are used, then the detection process is simple, but the detection sensitivity is insufficient for low-concentration biomarkers
Solution Approach 1:
The chip is divided into distinct functional regions: a metasurface region for fluorescence enhancement and a microchannel region for sample flow. This segmentation allows each region to be optimized for its specific function, achieving high detection sensitivity while maintaining manageable overall complexity
Solution Approach 2:
The metasurface introduces a nanoscale dimensional layer beneath the microchannel, creating a vertical stacking architecture. This dimensional transition from 2D planar to 3D stacked structure enables fluorescence enhancement without increasing the lateral footprint, thus improving sensitivity without proportionally increasing device complexity
2Measurement precision
If biomolecules are not efficiently immobilized on the metasurface, then the chip structure remains simple, but fluorescence enhancement and detection accuracy are insufficient
Solution Approach 1:
The metasurface is designed with locally optimized nanoscale structures (such as nanodisks or nanopyramids) that create enhanced electromagnetic fields specifically at the biomolecule immobilization sites. This local structural quality improvement enables efficient immobilization and fluorescence enhancement without requiring complex modifications across the entire chip
Solution Approach 2:
The metasurface parameters (nanodisk diameter, spacing, height, or nanopyramid geometry) are optimized to resonate at the excitation wavelength, creating localized surface plasmon resonance that enhances both immobilization efficiency and fluorescence signal. This parameter optimization achieves high detection accuracy while maintaining manufacturing feasibility through standard nanofabrication processes
3Measurement precision
If fluorescence intensity is not enhanced, then the detection system remains simple, but low-concentration biomarkers cannot be accurately detected
Solution Approach 1:
The metasurface replaces the need for high-power excitation light sources or complex optical cavities by using nanoscale electromagnetic field enhancement. This substitution of mechanical/optical systems with nanophotonic structures achieves fluorescence enhancement with lower energy input, enabling detection of low-concentration biomarkers without excessive energy consumption
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 chip enables high-sensitivity and reproducible fluorescence detection of biomolecules by efficiently capturing and immobilizing them, allowing for accurate detection of low-concentration biomarkers like antibodies and nucleic acids.
Implementation Method 1
a biomolecular inspection chip for fluorescence detection
Implementation Method 2
surface plasmon resonance (SPR)... The surface plasmon is a sort of compressional wave of electrons appearing on a metal-dielectric interface
Implementation Method 3
the excited fluorescence is resonated in a thickness direction of the laser cavity for light intensity enhancement
Data Source
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AI summary
The present invention has for its object to provide an inspection chip using a metasurface for detection of biomolecules by a fluorescence detection method. The inspection chip comprises a first substrate having a metasurface, and a second substrate positioned in opposition to the first substrate and having a microchannel, as shown in Fig. 1. The metasurface includes a gap for efficient immobilization of the biomolecules to be detected, and induces or develops fluorescence enhancement in a region including a wavelength range of fluorescence emitted by the biomolecules to be detected. The second substrate is formed of a material transparent to visible light or near infrared light, and the fluorescence resonates between the first substrate and second substrate.