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 () and Tim Liedl ()
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Robert Schreiber: Fakultät für Physik and Center for Nanoscience, Ludwig-Maximilians-Universität
Ngoc Luong: Boise State University
Zhiyuan Fan: Ohio University
Anton Kuzyk: Max-Planck-Institute for Intelligent Systems
Philipp C. Nickels: Fakultät für Physik and Center for Nanoscience, Ludwig-Maximilians-Universität
Tao Zhang: Fakultät für Physik and Center for Nanoscience, Ludwig-Maximilians-Universität
David M. Smith: Fakultät für Physik and Center for Nanoscience, Ludwig-Maximilians-Universität
Bernard Yurke: Boise State University
Wan Kuang: Boise State University
Alexander O. Govorov: Ohio University
Tim Liedl: Fakultät für Physik and Center for Nanoscience, Ludwig-Maximilians-Universität

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: 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.

Date: 2013
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DOI: 10.1038/ncomms3948

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