Plasmonic Toroidal Metamolecules Assembled by DNA Origami

Abstract

We demonstrate hierarchical assembly of plasmonic toroidal metamolecules, which exhibit tailored optical activity in the visible spectral range. Each metamolecule consists of four identical origami-templated helical building blocks. Such toroidal metamolecules show stronger chiroptical response than monomers and dimers of the helical building blocks. Enantiomers of the plasmonic structures yield opposite circular dichroism spectra. The experimental results agree well with the theoretical simulations. We also demonstrate that given the circular symmetry of the structures, distinct chiroptical response along their axial orientation can be uncovered via simple spin-coating of the metamolecules on substrates. Our work provides a new strategy to create plasmonic chiral platforms with sophisticated nanoscale architectures for potential applications such as chiral sensing using chemically-based assembly systems.

arXiv comment4 figures

References in corpus (4)

• DNA-based Self-Assembly of Chiral Plasmonic Nanostructures with Tailored Optical Response
• Past Achievements and Future Challenges in 3D Photonic Metamaterials
• A plasmonic nanorod that walks on DNA origami
• Optically resolving the dynamic walking of a plasmonic walker couple

Cited by in corpus (10)

• Chiral plasmonics
• DNA origami
• DNA-Assembled Advanced Plasmonic Architectures
• DNA Origami Route for Nanophotonics
• Selective control of reconfigurable chiral plasmonic metamolecules
• DNA nanotechnology-enabled chiral plasmonics: from static to dynamic
• Chiral Plasmonic Nanostructures Enabled by Bottom-Up Approaches
• Dynamic Plasmonic System That Responds to Thermal and Aptamer-Target Regulations
• Toroidal optical activity
• Collective resonance in helical superstructures of gold nanorods