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Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Published on: March 5, 2019

Plasmonic photonic crystals realized through DNA-programmable assembly.

Daniel J Park¹, Chuan Zhang¹, Jessie C Ku²

¹Departments of Chemistry and International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208.

Proceedings of the National Academy of Sciences of the United States of America

|December 31, 2014

Summary

Researchers developed 3D plasmonic photonic crystals using DNA assembly. These structures enable strong light-plasmon interactions with tunable properties for enhanced optical applications.

Keywords:

3D photonic crystals DNA-programmable assembly deep subwavelength scale plasmonics strong coupling

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Last Updated: Apr 19, 2026

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Area of Science:

Nanophotonics
Plasmonics
Materials Science

Background:

Three-dimensional dielectric photonic crystals offer enhanced light-matter interactions through high Q factors.
Plasmonic counterparts, while promising for small mode volumes, lack experimental exploration due to synthetic challenges.

Purpose of the Study:

To experimentally investigate strong light-plasmon interactions in 3D plasmonic photonic crystals.
To develop a method for independently controlling crystal parameters in the deep subwavelength regime.

Main Methods:

Utilized DNA-programmable assembly for fabricating 3D plasmonic photonic crystals.
Controlled lattice constants and nanoparticle diameters independently.
Probed light-plasmon coupling using backscattering spectra and dispersion diagrams.

Main Results:

Demonstrated strong light-plasmon coupling in the fabricated 3D plasmonic photonic crystals.
Observed mode splitting of 0.10 and 0.24 eV.
Numerical simulations predicted enhanced crystal photonic modes with silver coating, achieving moderate Q factors (~10^2).

Conclusions:

DNA-programmable assembly provides a viable route for creating 3D plasmonic photonic crystals with tunable subwavelength features.
These structures exhibit strong light-plasmon interactions, paving the way for novel optical devices.
Further enhancement of Q factors is achievable through material modification.