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Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates
Published on: March 5, 2019
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Long- and short-ranged chiral interactions in DNA-assembled plasmonic chains
Kevin Martens1, Felix Binkowski2, Linh Nguyen1
1Faculty of Physics, Ludwig-Maximilians-University, Munich, Germany.
Nature Communications
|April 2, 2021
Summary
Researchers demonstrate chiral transfer over 100nm using DNA origami and plasmonic nanostructures. An achiral nanosphere enhances circular dichroism (CD) signals in chiral gold nanorods.
Area of Science:
- Plasmonics
- Nanotechnology
- Chiroptical Spectroscopy
Background:
- Circular dichroism (CD) is vital for analyzing molecular chirality and protein structures.
- Chiral plasmonic nanostructures offer promising applications in sensing and optical materials.
- Effective plasmonic coupling is essential for significant CD signals in these structures.
Purpose of the Study:
- To investigate chiral transfer over extended distances using plasmonic nanostructures.
- To demonstrate the role of coupling entities in enhancing CD signals.
- To explore the use of DNA origami for precise arrangement of chiral nanostructures.
Main Methods:
- Fabrication of chiral gold nanorod pairs using DNA origami.
- Integration of an achiral nanosphere as a coupling entity.
- Measurement and simulation of circular dichroism (CD) spectra.
Main Results:
- Chiral transfer was achieved over distances approaching 100 nm.
- The achiral nanosphere significantly enhanced the CD response and introduced a new chiral feature.
- A redshift in the nanorods' longitudinal plasmonic resonance was observed.
Conclusions:
- Achiral intermediary particles can effectively mediate chiral transfer in plasmonic systems.
- DNA origami provides a powerful tool for constructing complex chiral plasmonic architectures.
- This work advances the understanding and application of nanoscale chiral optical phenomena.
