title: A compact light concentrator by the use of plasmonic faced folded nano-rods.
abstract: We propose a compact nano-metallic structure for enhancing and concentrating far-field transmission: a faced folded nano-rod (FFR) unit, composed of two folded metallic nano-rods placed facing each other in an aperture. By analyzing local charge, field, and current distributions in the FFR unit using three-dimensional finite difference time domain (FDTD) calculation results, we show that although charge and field configurations become somewhat different depending on the polarization states of the illumination, similar current flows are formed in the FFR unit, which entail similar far-field radiation patterns regardless of the polarization states, making the FFR unit a quasi-polarization-insensitive field concentrator. We demonstrate this functionality of the FFR unit experimentally using the holographic microscopy which provides us a three-dimensional map of the complex wavefronts of optical fields emanating from the FFR unit.
authors: National Creative Research Center for Active Plasmonics Application Systems, Inter-University Semiconductor Research Center and School of Electrical Engineering, Seoul National University, Seoul 151-744, Korea.
authors: Taerin
authors: T
authors: Chung
authors: Yongjun
authors: Y
authors: Lim
authors: Il-Min
authors: IM
authors: Lee
authors: Seoung-Yeol
authors: SY
authors: Lee
authors: Jinyoung
authors: J
authors: Choi
authors: Sookyoung
authors: S
authors: Roh
authors: Kyoung-Youm
authors: KY
authors: Kim
authors: Byoungho
authors: B
authors: Lee
mesh_terms: D004867:Equipment Design; D006046:Gold / Q000737:chemistry; D006696:Holography / Q000379:methods; D008027:Light; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry; D008670:Metals / Q000737:chemistry; D008853:Microscopy / Q000379:methods; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry*; D055095:Optics and Photonics; D017785:Photons; D020349:Surface Plasmon Resonance; D013499:Surface Properties; D013997:Time Factors
chemical_list: D008670:Metals; D006046:Gold