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DNA-Templated Ultracompact Optical Antennas for Unidirectional Single-Molecule Emission
Fangjia Zhu1, María Sanz-Paz1, Antonio I Fernández-Domínguez2
1Department of Physics, University of Fribourg, Fribourg CH-1700, Switzerland.
Nano Letters
|July 25, 2022
Summary
Researchers developed an ultracompact optical antenna using DNA origami to achieve unidirectional emission from a single fluorophore. This breakthrough enables precise control over light radiation patterns with a novel nanoantenna design.
Area of Science:
- Nanophotonics and Plasmonics
- Biotechnology and Nanotechnology
Background:
- Optical antennas are nanostructures that control light-matter interactions.
- Existing nanoantenna designs struggle to modify the spatial characteristics of light emission.
- Efficiently tailoring fluorophore absorption and emission rates has been achieved, but spatial control remains difficult.
Purpose of the Study:
- To demonstrate unidirectional emission from a single fluorophore using an ultracompact optical antenna.
- To overcome the limitations of existing nanoantenna designs in controlling radiation spatial characteristics.
- To utilize DNA origami for precise positioning of fluorophores within nanostructures.
Main Methods:
- Fabrication of an ultracompact optical antenna using two side-by-side gold nanorods.
- Self-assembly of nanorods using DNA origami for precise fluorophore positioning.
- Characterization of emission properties of a single fluorophore coupled to the nanoantenna.
Main Results:
- Achieved unidirectional emission from a single fluorophore.
- Demonstrated a forward to backward emission ratio of up to 9.9 dB.
- Validated the effectiveness of the ultracompact, DNA-origami-guided nanoantenna design.
Conclusions:
- The developed ultracompact optical antenna enables precise control over single fluorophore emission directionality.
- DNA origami is a powerful tool for assembling nanostructures and positioning emitters for advanced photonic applications.
- This work paves the way for novel applications in nanoscale light manipulation and imaging.
