Structured Substrates with Plasmonic Nanostructures for Light Detection
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Solution Overview
Problem
Current biological and chemical analysis systems face challenges in detecting light emissions from smaller reaction sites with higher density, leading to reduced light intensity and increased difficulty in distinguishing which sites emit light, while also requiring faster scan times, which complicates reliable detection.
Innovation Solution
The development of structured substrates with nanoparticles and gel materials enhances light emissions by increasing excitation light intensity and controlling directionality, using plasmon resonant materials like Gold, Silver, and other metals to amplify electromagnetic energy, and employing nanostructures such as nanorings and nanoplugs to improve fluorescence intensity and detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reaction sites are made smaller and density is increased, then more reactions can be detected simultaneously, but light intensity from each site decreases making detection more difficult
Solution Approach 1:
The patent applies local quality by introducing nanoparticles specifically at the reaction site locations rather than uniformly across the entire substrate. These localized nanoparticles generate localized surface plasmons that concentrate light energy precisely where needed, enhancing the signal from each individual reaction site without affecting other regions. This resolves the contradiction by providing enhanced light intensity at high-density reaction sites without requiring uniform illumination across the whole surface.
Solution Approach 2:
The nanoparticles serve as intermediary elements between the incident light and the fluorescent molecules at reaction sites. The nanoparticles absorb incident light and re-emit it as localized surface plasmons, which then excite the fluorescent molecules more efficiently. This intermediary mechanism amplifies the light signal from each reaction site, enabling detection at high densities where direct illumination would be insufficient.
2Productivity
If scan time is decreased to improve productivity, then fewer photons are detected reducing detection reliability
Solution Approach 1:
By concentrating light enhancement capabilities locally at reaction sites through nanoparticles, the system achieves higher signal intensity without requiring longer scan times. The localized plasmonic enhancement provides sufficient photons during rapid scanning, maintaining detection reliability even at increased scan speeds. This resolves the contradiction by providing signal amplification that compensates for reduced integration time.
Solution Approach 2:
The patent changes the optical parameters of the reaction sites by introducing nanoparticles that modify local light distribution. The nanoparticles alter the local electromagnetic field characteristics, increasing the effective photon density at reaction sites. This parameter change enables reliable detection at faster scan rates by providing sufficient signal intensity within shorter measurement windows.
3Productivity
If reaction sites are made smaller, then density increases, but it becomes more difficult to distinguish which sites emitted light
Solution Approach 1:
The nanoparticles create localized optical hotspots at each reaction site, providing spatially distinct signal enhancement. Even at high densities, each nanoparticle cluster generates a localized plasmonic field that is spatially confined to its immediate vicinity. This local quality enhancement maintains spatial resolution and enables distinction between adjacent reaction sites despite their proximity, resolving the contradiction between high density and site distinguishability.
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 increases the signal intensity from fluorescently labeled samples, reduces sequencing errors, and enables faster scan speeds by enhancing light emissions and improving the signal-to-noise ratio, making it more cost-effective and reliable for applications like DNA sequencing.
Implementation Method 1
The structured substrate may include a plurality of nanoparticles distributed on a solid support. The nanoparticles may be formed of a plasmon resonant material. The nanoparticles may be configured to amplify electromagnetic energy that propagates into or reflects from a corresponding reaction cavity or reaction site.
Implementation Method 2
The optical emissions may be generated by, for example, fluorescence, chemiluminescence, bioluminescence, electroluminescence, radioluminescence, and the like.
Data Source
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Figure 3A~3C
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AI summary
A structured substrate comprising a substrate body having an active side, the substrate body including reaction cavities that open along the active side and interstitial regions that separate the reaction cavities; and an ensemble amplifier positioned within each of the reaction cavities, the ensemble amplifier including a plurality of nanostructures configured to at least one of amplify electromagnetic energy that propagates into the corresponding reaction cavity or amplify electromagnetic energy that is generated within the corresponding reaction cavity.