title: Hybrid Semiconductor Nanowire-Metallic Yagi-Uda Antennas.
abstract: We demonstrate the directional emission of individual GaAs nanowires by coupling this emission to Yagi-Uda optical antennas. In particular, we have replaced the resonant metallic feed element of the nanoantenna by an individual nanowire and measured with the microscope the photoluminescence of the hybrid structure as a function of the emission angle by imaging the back focal plane of the objective. The precise tuning of the dimensions of the metallic elements of the nanoantenna leads to a strong variation of the directionality of the emission, being able to change this emission from backward to forward. We explain the mechanism leading to this directional emission by finite difference time domain simulations of the scattering efficiency of the antenna elements. These results cast the first step toward the realization of electrically driven optical Yagi-Uda antenna emitters based on semiconductors nanowires.
authors.affiliation: †Laboratoire des Matériaux Semiconducteurs, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.|‡Center for Nanophotonics, FOM Institute AMOLF, c/o Philips Research Laboratories, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Ramezani
authors.affiliation: †Laboratoire des Matériaux Semiconducteurs, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
authors.forename: Alberto
authors.initials: A
authors.lastname: Casadei
authors.affiliation: ‡Center for Nanophotonics, FOM Institute AMOLF, c/o Philips Research Laboratories, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands.
authors.forename: Grzegorz
authors.initials: G
authors.lastname: Grzela
authors.affiliation: †Laboratoire des Matériaux Semiconducteurs, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
authors.forename: Federico
authors.initials: F
authors.lastname: Matteini
authors.affiliation: †Laboratoire des Matériaux Semiconducteurs, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
authors.forename: Gözde
authors.initials: G
authors.lastname: Tütüncüoglu
authors.affiliation: †Laboratoire des Matériaux Semiconducteurs, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
authors.forename: Daniel
authors.initials: D
authors.lastname: Rüffer
authors.affiliation: †Laboratoire des Matériaux Semiconducteurs, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
authors.forename: Anna
authors.initials: A
authors.lastname: Fontcuberta i Morral
authors.affiliation: ‡Center for Nanophotonics, FOM Institute AMOLF, c/o Philips Research Laboratories, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands.|§COBRA Research Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
authors.forename: Jaime
authors.initials: J
authors.lastname: Gómez Rivas
keywords: Fourier microscopy; Semiconductor nanowire; Yagi-Uda optical antenna; directional emission