title: Surface plasmon resonances in periodic and random patterns of gold nano-disks for broadband light harvesting.
abstract: We analyze the localized surface plasmon resonance spectra of periodic square lattice arrays of gold nano-disks, and we describe numerically and experimentally the effect of disorder on resonance width, spectrum, and EM field enhancement in increasingly randomized patterns. The periodic structure shows a narrower and stronger extinction peak, conversely we observe an increase of up to (1-2)×10(2) times enhancement as the disorder is gradually introduced. This allows for simpler, lower resolution fabrication, cost-effective in light harvesting for solar cell and sensing applications. We show that dipole-dipole interactions contribute to diffract light parallel to the surface as a mean of long-range coupling between the nano-disks.
authors.affiliation: Department of Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, Hodogaya-ku, Yokohama, Japan. nishijima@ynu.ac.jp
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Nishijima
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Rosa
authors.forename: Saulius
authors.initials: S
authors.lastname: Juodkazis
mesh_terms: D015374:Biosensing Techniques; D004574:Electromagnetic Fields; D004867:Equipment Design; D006046:Gold / Q000737:chemistry*; D021621:Imaging, Three-Dimensional; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D008962:Models, Theoretical; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D016011:Normal Distribution; D055095:Optics and Photonics; D012993:Solar Energy; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D006046:Gold