Raman Field Enhancement Structure for Stable SERS Sample Placement
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Solution Overview
Problem
Existing Raman spectroscopic apparatuses using localized surface plasmon resonance (LSPR) require further improvements in detection sensitivity.
Innovation Solution
An electric field enhancement device with a substrate, microstructures, and a transparent layer having a concavo-convex structure on its surface, which maximizes the enhanced electric field at a position opposite to the microstructures, separated from them, enhancing Raman scattered light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the enhanced electric field is maximized close to the microstructures, then the detection sensitivity is improved, but the target substance placement precision requirement increases
Solution Approach 1:
The patent introduces a transparent layer as an intermediary between the microstructures and the target substance. This layer has a concavo-convex structure that transmits the enhanced electric field from the microstructures while providing a flat upper surface for stable target substance placement. The intermediary layer decouples the field enhancement location from the sample placement location, allowing sensitivity improvement without increasing positioning precision requirements.
Solution Approach 2:
The patent utilizes the vertical dimension by creating a concavo-convex structure in the transparent layer. The convex portions extend upward to receive the enhanced electric field from the microstructures below, while the flat upper surface provides a stable placement area. This dimensional approach separates the field interaction zone from the sample placement zone in the vertical direction.
2Stability of the object's composition
If the transparent layer is made thicker to separate the target substance from microstructures, then the stability of target substance placement is improved, but the enhanced electric field intensity decreases
Solution Approach 1:
The patent employs convex portions with curved surfaces in the transparent layer. These convex portions act as focal points that concentrate and transmit the enhanced electric field from the microstructures to the target substance placement area. The curvature helps to guide and concentrate the electric field lines, maintaining field intensity while allowing physical separation.
Solution Approach 2:
The transparent layer has non-uniform structure with convex portions strategically positioned to receive enhanced electric field from specific microstructures. The local convex regions concentrate the electric field where needed, while the overall layer provides separation and stability. This local quality variation optimizes both field intensity and placement stability.
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
Improves detection sensitivity by maximizing the enhanced electric field away from the microstructures, allowing stable placement of target substances and reducing the need for precise positioning, thus enhancing detection signals for various sample sizes.
Implementation Method 1
A Raman spectroscopic apparatus using localized surface plasmon resonance (LSPR) is known as one of spectroscopic techniques for detecting low-concentration sample molecules. In such a Raman spectroscopic apparatus, an enhanced electric field is formed by an electric field enhancement device having a nanometer-scale microstructure to generate surface enhanced Raman scattering (SERS)
Implementation Method 2
the transparent layer has a concavo-convex structure on a surface at an opposite side to the microstructures, and an enhanced electric field generated by the plurality of microstructures is maximized at a position at an opposite side of the microstructures to the substrate in a normal direction to the substrate and separated from the plurality of microstructures
Data Source
AI summary
An electric field enhancement device includes a substrate, a plurality of microstructures provided to the substrate and having electrical conductivity, and a transparent layer configured to cover the plurality of microstructures and the substrate, wherein the transparent layer has a concavo-convex structure on a surface at an opposite side to the microstructures, and an enhanced electric field generated by the plurality of microstructures is maximized at a position at an opposite side of the microstructures to the substrate in a normal direction to the substrate and separated from the plurality of microstructures.