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Updated: Jun 3, 2026

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

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

Published on: July 21, 2023

Directivity enhanced Raman spectroscopy using nanoantennas.

Aftab Ahmed¹, Reuven Gordon

¹Department of Electrical and Computer Engineering, University of Victoria, Victoria, British Columbia V8W 3P6, Canada.

|March 25, 2011

Summary

This summary is machine-generated.

We developed a nanoantenna to enhance Raman scattering signals. This device directs emitted light, boosting Raman signals by 5.5x and enabling efficient detection with standard microscopes.

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Area of Science:

Nanophotonics
Spectroscopy
Materials Science

Background:

Directing optical emission is crucial for efficient light detection and excitation.
Raman scattering, a light-scattering process, can benefit from enhanced directivity in both excitation and emission.
Existing antenna designs for enhanced Raman scattering have limitations in practical applications.

Purpose of the Study:

To demonstrate directivity-enhanced Raman scattering (DERS) using a novel nanoantenna design.
To enhance the efficiency of Raman signal detection and excitation.
To enable DERS in conventional Raman microscopes.

Main Methods:

Fabrication of a nanoantenna using focused ion beam milling.
Design of a resonant ring-reflector nanoantenna to shape emitted light.
Quantitative comparison of experimental results with comprehensive numerical simulations.

Main Results:

Achieved directivity-enhanced Raman scattering (DERS) with the fabricated nanoantenna.
Observed a 5.5-fold boost in the measured Raman signal compared to a ground plane alone.
Demonstrated near-optimal coupling of beam power into the microscope's numerical aperture.
Confirmed experimental findings through quantitative agreement with numerical simulations.

Conclusions:

The developed ring-reflector nanoantenna effectively enhances Raman scattering signals.
This design enables efficient DERS using conventional Raman microscopes, overcoming limitations of previous antenna types.
The achieved directivity and signal enhancement pave the way for more sensitive Raman spectroscopy applications.