TY - JOUR
T1 - Broadband optical spin dependent reflection in self-assembled GaAs-based nanowires asymmetrically hybridized with Au
AU - Petronijevic, Emilija
AU - Belardini, Alessandro
AU - Leahu, Grigore
AU - Hakkarainen, Teemu
AU - Piton, Marcelo Rizzo
AU - Koivusalo, Eero
AU - Sibilia, Concita
N1 - Funding Information:
Financial support from the Academy of Finland projects NanoLight (# 310985) and QuantSi (# 323989) is acknowledged. TH acknowledges financial support from the Sapienza University visiting professor program. A.B. acknowledges LASAFEM Sapienza Università di Roma Infrastructure Project prot. n. MA31715C8215A268.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021
Y1 - 2021
N2 - Hybridization of semiconductor nanostructures with asymmetric metallic layers offers new paths to circular polarization control and chiral properties. Here we study, both experimentally and numerically, chiral properties of GaAs-based nanowires (NWs) which have two out of six sidewalls covered by Au. Sparse ensembles of vertical, free-standing NWs were fabricated by means of lithography-free self-assembled technique on Si substrates and subsequently covered by Au using tilted evaporation. We report on optical spin-dependent specular reflection in the 680–1000 nm spectral range when the orientation of the golden layers follows the rule of extrinsic chirality. The analysis shows reflection peaks of the chiral medium whose intensity is dependent on the light handedness. We further propose a novel, time-efficient numerical method that enables a better insight into the far-field intensity and distribution of the scattered light from a sparse NW ensembles. The measurements done on three different samples in various orientations show good agreement with theoretical predictions over a broad wavelength range.
AB - Hybridization of semiconductor nanostructures with asymmetric metallic layers offers new paths to circular polarization control and chiral properties. Here we study, both experimentally and numerically, chiral properties of GaAs-based nanowires (NWs) which have two out of six sidewalls covered by Au. Sparse ensembles of vertical, free-standing NWs were fabricated by means of lithography-free self-assembled technique on Si substrates and subsequently covered by Au using tilted evaporation. We report on optical spin-dependent specular reflection in the 680–1000 nm spectral range when the orientation of the golden layers follows the rule of extrinsic chirality. The analysis shows reflection peaks of the chiral medium whose intensity is dependent on the light handedness. We further propose a novel, time-efficient numerical method that enables a better insight into the far-field intensity and distribution of the scattered light from a sparse NW ensembles. The measurements done on three different samples in various orientations show good agreement with theoretical predictions over a broad wavelength range.
U2 - 10.1038/s41598-021-83899-2
DO - 10.1038/s41598-021-83899-2
M3 - Article
C2 - 33619343
AN - SCOPUS:85101363368
SN - 2045-2322
VL - 11
JO - Scientific Reports
JF - Scientific Reports
IS - 1
M1 - 4316
ER -