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Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas

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Nanogap ring antennae as plasmonically coupled SERRS substrates.

Alasdair W Clark¹, Jonathan M Cooper

¹School of Engineering, University of Glasgow, Rankine Building, Oakfield Avenue, Glasgow, UK.

Small (Weinheim an Der Bergstrasse, Germany)

|November 25, 2010

Summary

Researchers developed ultrasmall, split nanoring antennae for enhanced plasmonic applications. These novel nanostructures exhibit extreme Raman sensitivity, paving the way for advanced metamaterial applications.

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Area of Science:

Plasmonics and Nanophotonics
Metamaterials
Nanotechnology

Background:

Localized field coupling is crucial for enhancing plasmonic applications.
Ultrasmall nanostructures offer unique optical properties.
Nanoring antennae are promising for sensing and metamaterial applications.

Purpose of the Study:

To report the fabrication and optical characterization of novel ultrasmall multiple-split nanoring antennae.
To investigate the plasmonic properties and intersegmental coupling of nanorings with varying numbers of splits.
To evaluate the sensory functionality of these nanodevices using DNA hybridization assays.

Main Methods:

Electron-beam lithography was used to engineer ≈6 nm splits in silver nanophotonic rings.
Finite-element analysis was employed to explore plasmonic characteristics and surface charge distribution.
Surface-enhanced resonance Raman spectroscopy (SERRS) was utilized for DNA hybridization assays.

Main Results:

Three devices with 3, 4, and 5 splits, spectrally tuned to 532 nm, exhibited distinct plasmonic properties.
Variations in surface charge distribution and intersegmental coupling were observed at different polarization angles.
The nanorings demonstrated extreme Raman sensitivity, indicating high potential for sensing applications.

Conclusions:

The unique geometry of multiple-split nanorings leads to novel plasmon hybridization.
These nanostructures are suitable for applications requiring extreme Raman sensitivity.
The developed nanodevices show promise for future metamaterial applications.