title: Plasmonic photonic crystals realized through DNA-programmable assembly.
abstract: Three-dimensional dielectric photonic crystals have well-established enhanced light-matter interactions via high Q factors. Their plasmonic counterparts based on arrays of nanoparticles, however, have not been experimentally well explored owing to a lack of available synthetic routes for preparing them. However, such structures should facilitate these interactions based on the small mode volumes associated with plasmonic polarization. Herein we report strong light-plasmon interactions within 3D plasmonic photonic crystals that have lattice constants and nanoparticle diameters that can be independently controlled in the deep subwavelength size regime by using a DNA-programmable assembly technique. The strong coupling within such crystals is probed with backscattering spectra, and the mode splitting (0.10 and 0.24 eV) is defined based on dispersion diagrams. Numerical simulations predict that the crystal photonic modes (Fabry-Perot modes) can be enhanced by coating the crystals with a silver layer, achieving moderate Q factors (∼10(2)) over the visible and near-infrared spectrum.
authors.affiliation: Departments of Chemistry and International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Park
authors.affiliation: Departments of Chemistry and International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208.
authors.forename: Chuan
authors.initials: C
authors.lastname: Zhang
authors.affiliation: International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208 Materials Science and Engineering and.
authors.forename: Jessie C
authors.initials: JC
authors.lastname: Ku
authors.affiliation: International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208 Materials Science and Engineering and.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Departments of Chemistry and International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208 schatz@chem.northwestern.edu chadnano@northwestern.edu.
authors.forename: George C
authors.initials: GC
authors.lastname: Schatz
authors.affiliation: Departments of Chemistry and International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208 Materials Science and Engineering and schatz@chem.northwestern.edu chadnano@northwestern.edu.
authors.forename: Chad A
authors.initials: CA
authors.lastname: Mirkin
mesh_terms: D003460:Crystallization; D004247:DNA / Q000737:chemistry*; D055095:Optics and Photonics
chemical_list: D004247:DNA
keywords: 3D photonic crystals; DNA-programmable assembly; deep subwavelength scale; plasmonics; strong coupling