title: Confinement of Surface Plasmon Polaritons by Heterostructures of Plasmonic Crystals.
abstract: Square lattice plasmonic crystals (SQ-PlCs) composed of silver pillars generate large bandgaps for surface plasmon polaritons (SPPs). SPP confinement is demonstrated using one- and two-dimensional heterostructures of SQ-PlCs comprised of cylindrical pillars with different diameters in a common square lattice. Two kinds of localized modes are observed to appear in the heterostructures by photon map imaging using cathodoluminescence (CL) technique combined with a scanning transmission electron microscopy (STEM). Angle-resolved CL spectroscopy reveals contrasting characteristics of the two localized modes in their emission distributions, indicating that they originate from the band-edge A and E modes of the matrix SQ-PlC.
authors.affiliation: Quantum Nanoelectronics Reserch Center, Tokyo Institute of Technology , Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan.|Center of Advanced Instrumental Analysis, Kyushu University , 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: Hikaru
authors.initials: H
authors.lastname: Saito
authors.affiliation: Graduate School of Decision Science and Technology, Tokyo Institute of Technology , Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan.|Department of Condensed Matter Physics, Tokyo Institute of Technology , Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan.
authors.forename: Shohei
authors.initials: S
authors.lastname: Mizuma
authors.affiliation: Quantum Nanoelectronics Reserch Center, Tokyo Institute of Technology , Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan.|Department of Condensed Matter Physics, Tokyo Institute of Technology , Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan.|Department of Innovative and Engineered Materials, Tokyo Institute of Technology , Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Yamamoto
keywords: cathodoluminescence; cavity; heterostructure; plasmonic crystal; scanning transmission electron microscopy; surface plasmon polariton