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Self-Assembled 3D Nanosplit Rings for Plasmon-Enhanced Optofluidic Sensing
Chunhui Dai1, Zihao Lin1, Kriti Agarwal1
1Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States.
Nano Letters
|August 19, 2020
Summary
Researchers developed 3D plasmonic nanocylinders that combine nanoplasmonics and nanofluidics. This novel sensor design enhances molecular detection sensitivity by concentrating electromagnetic fields within fluidic channels.
Area of Science:
- Nanotechnology
- Plasmonics
- Biomedical Sensing
Background:
- Traditional 2D plasmonic sensors require precise molecule positioning in limited hotspots.
- Existing sensors have restricted electromagnetic field enhancement near surfaces.
Purpose of the Study:
- To create 3D plasmonic nanostructures that integrate nanoplasmonics and nanofluidics.
- To improve sensor sensitivity and detection capabilities for targeted molecules.
Main Methods:
- Fabrication of segmented nanocylinders with 3D plasmonic gaps using electron irradiation-triggered self-assembly.
- Integration of plasmonic patterns within inner cylindrical walls to form nanofluidic channels.
- Characterization using surface-enhanced Raman spectroscopy (SERS).
Main Results:
- Achieved simultaneous electromagnetic field enhancement and fluid confinement in 3D nanostructures.
- Demonstrated rapid diffusion of species to larger spatial hotspots within the 3D structures.
- Observed a 22-fold increase in hemoglobin detection intensity compared to 2D nanostructures.
Conclusions:
- The developed 3D plasmonic nanocylinders bridge nanoplasmonics and nanofluidics for enhanced sensing.
- This hybrid system offers superior sensitivity due to improved molecular interactions in 3D hotspots.
- The technology shows significant potential for advanced biosensing applications.
