Chiral plasmonic DNA nanostructures with switchable circular dichroism

Robert Schreiber, Ngoc Luong, Zhiyuan Fan, Anton Kuzyk, Philipp C. Nickels, Tao Zhang, David M. Smith, Bernard Yurke, Wan Kuang, Alexander O. Govorov, Tim Liedl*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

211 Citations (Scopus)

Abstract

Circular dichroism spectra of naturally occurring molecules and also of synthetic chiral arrangements of plasmonic particles often exhibit characteristic bisignate shapes. Such spectra consist of peaks next to dips (or vice versa) and result from the superposition of signals originating from many individual chiral objects oriented randomly in solution. Here we show that by first aligning and then toggling the orientation of DNA-origami-scaffolded nanoparticle helices attached to a substrate, we are able to reversibly switch the optical response between two distinct circular dichroism spectra corresponding to either perpendicular or parallel helix orientation with respect to the light beam. The observed directional circular dichroism of our switchable plasmonic material is in good agreement with predictions based on dipole approximation theory. Such dynamic metamaterials introduce functionality into soft matter-based optical devices and may enable novel data storage schemes or signal modulators.

Original languageEnglish
Article number2948
JournalNature Communications
Volume4
DOIs
Publication statusPublished - 13 Dec 2013
MoE publication typeA1 Journal article-refereed

Fingerprint

Dive into the research topics of 'Chiral plasmonic DNA nanostructures with switchable circular dichroism'. Together they form a unique fingerprint.

Cite this