Nanoscale form dictates mesoscale function in plasmonic DNA-nanoparticle superlattices

Area of Science:

• Nanotechnology and Materials Science
• Plasmonics and Metamaterials
• DNA Nanotechnology

Background:

• Nanoscale manipulation enables unique material properties not achievable in bulk.
• Precise 3D localization of nanoscale objects is crucial for functional architectures.
• Establishing structure-function relationships across size regimes is essential for progress.

Purpose of the Study:

• To demonstrate bottom-up assembly of mesoscale superlattice crystals with engineered optical properties.
• To investigate the transition of optical properties from constituent nanoparticles to the superlattice.
• To develop a theoretical framework for controlling light interaction in plasmonic metamaterial superlattices.

Main Methods:

• Utilized DNA as a programmable ligand for self-assembly of gold nanoparticles.
• Fabricated two- and three-dimensional mesoscale superlattice crystals.
• Controlled inter-particle spacing to tune optical characteristics.

Main Results:

• Successfully assembled superlattice crystals with precisely engineered optical properties.
• Demonstrated a transition in optical properties based on controlled nanoparticle spacing.
• Showcased superlattices adopting photonic properties defined by the mesoscale crystal structure (rhombic dodecahedron).

Conclusions:

• DNA-templated assembly provides precise control over nanoscale architectures and their optical functions.
• Mesoscale crystal structure and nanoparticle spacing are key design parameters for optical properties.
• The developed theoretical framework aids in designing plasmonic metamaterials for specific light interactions.