title: Plasmon-Exciton Coupling Using DNA Templates.
abstract: Coherent energy exchange between plasmons and excitons is a phenomenon that arises in the strong coupling regime resulting in distinct hybrid states. The DNA-origami technique provides an ideal framework to custom-tune plasmon-exciton nanostructures. By employing this well controlled self-assembly process, we realized hybrid states by precisely positioning metallic nanoparticles in a defined spatial arrangement with fixed nanometer-sized interparticle spacing. Varying the nanoparticle diameter between 30 nm and 60 nm while keeping their separation distance constant allowed us to precisely adjust the plasmon resonance of the structure to accurately match the energy frequency of a J-aggregate exciton. With this system we obtained strong plasmon-exciton coupling and studied far-field scattering at the single-structure level. The individual structures displayed normal mode splitting up to 170 meV. The plasmon tunability and the strong field confinement attained with nanodimers on DNA-origami renders an ideal tool to bottom-up assembly plasmon-exciton systems operating at room temperature.
authors.affiliation: Faculty of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität (LMU) München , Geschwister-Scholl- Platz 1, 80539 Munich, Germany.
authors.forename: Eva-Maria
authors.initials: EM
authors.lastname: Roller
authors.affiliation: Department of Electrical and Computer Engineering, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States.
authors.forename: Christos
authors.initials: C
authors.lastname: Argyropoulos
authors.affiliation: Faculty of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität (LMU) München , Geschwister-Scholl- Platz 1, 80539 Munich, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Högele
authors.affiliation: Faculty of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität (LMU) München , Geschwister-Scholl- Platz 1, 80539 Munich, Germany.
authors.forename: Tim
authors.initials: T
authors.lastname: Liedl
authors.affiliation: Faculty of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität (LMU) München , Geschwister-Scholl- Platz 1, 80539 Munich, Germany.
authors.forename: Mauricio
authors.initials: M
authors.lastname: Pilo-Pais
mesh_terms: D004247:DNA / Q000737:chemistry*; D053768:Metal Nanoparticles; D020349:Surface Plasmon Resonance
chemical_list: D004247:DNA
keywords: DNA origami; J-aggregates; Rabi splitting; excitons; plasmons; plexcitons