title: Directional radiation of Babinet-inverted optical nanoantenna integrated with plasmonic waveguide.
abstract: We present a Babinet-inverted optical nanoantenna integrated with a plasmonic waveguide. Using an integrated nanoantenna, we can couple the plasmon guide mode in a metal-insulator-metal (MIM) structure into the resonant antenna feed directly. The resonantly excited feed slot then radiates to free space and generates a magnetic dipole-like far-field pattern. The coupling efficiency of the integrated nanoantenna is calculated as being approximately 19% using a three-dimensional finite-difference time-domain (3D FDTD) simulation. By adding an auxiliary groove structure along with the feed, the radiation direction can be controlled similar to an optical Yagi-Uda antenna. We also determine, both theoretically and experimentally, that groove depth plays a significant role to function groove structure as a reflector or a director. The demonstrated Babinet-inverted optical nanoantenna integrated with a plasmonic waveguide can be used as a "plasmonic via" in plasmonic nanocircuits.
authors.affiliation: Samsung Advanced Institute of Technology, 130, Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-803, Korea.
authors.forename: Jineun
authors.initials: J
authors.lastname: Kim
authors.affiliation: Samsung Advanced Institute of Technology, 130, Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-803, Korea.
authors.forename: Young-Geun
authors.initials: YG
authors.lastname: Roh
authors.affiliation: 1] Samsung Advanced Institute of Technology, 130, Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-803, Korea [2] Center for Artificial Low Dimensional Electronic Systems of the Institute for Basic Science, 77, Cheongnam-Ro, Pohang, 790 - 784, Korea.
authors.forename: Sangmo
authors.initials: S
authors.lastname: Cheon
authors.affiliation: Samsung Advanced Institute of Technology, 130, Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-803, Korea.
authors.forename: Un Jeong
authors.initials: UJ
authors.lastname: Kim
authors.affiliation: Samsung Advanced Institute of Technology, 130, Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-803, Korea.
authors.forename: Sung Woo
authors.initials: SW
authors.lastname: Hwang
authors.affiliation: Samsung Advanced Institute of Technology, 130, Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-803, Korea.
authors.forename: Yeonsang
authors.initials: Y
authors.lastname: Park
authors.affiliation: Samsung Advanced Institute of Technology, 130, Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-803, Korea.
authors.forename: Chang-Won
authors.initials: CW
authors.lastname: Lee