TY - JOUR
T1 - Controlling the Polarization State of Light with Plasmonic Metal Oxide Metasurface
AU - Kim, Jongbum
AU - Choudhury, Sajid
AU - DeVault, Clayton
AU - Zhao, Yang
AU - Kildishev, Alexander V.
AU - Shalaev, Vladimir M.
AU - Alù, Andrea
AU - Boltasseva, Alexandra
N1 - Funding Information:
The Purdue team is supported by the U.S. Army Research Office Grant 63133-PH (W911NF-13-1-0226) Flat Photonics with Metasurfaces and the Air Force Office of Scientific Research MURI Grant FA9550-14-1-0389 Active Metasurfaces for Advanced Wavefront Engineering and Waveguiding. A.A. and Y.Z. were supported by the Welch foundation with Grant No. F-1802 and AFOSR with Grant No. FA9550-13-1-0204.
Publisher Copyright:
© 2016 American Chemical Society.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2016/10/25
Y1 - 2016/10/25
N2 - Conventional plasmonic materials, namely, noble metals, hamper the realization of practical plasmonic devices due to their intrinsic limitations, such as lack of capabilities to tune in real-time their optical properties, failure to assimilate with CMOS standards, and severe degradation at increased temperatures. Transparent conducting oxide (TCO) is a promising alternative plasmonic material throughout the near- and mid-infrared wavelengths. In addition to compatibility with established silicon-based fabrication procedures, TCOs provide great flexibility in the design and optimization of plasmonic devices because their intrinsic optical properties can be tailored and dynamically tuned. In this work, we experimentally demonstrate metal oxide metasurfaces operating as quarter-waveplates (QWPs) over a broad near-infrared (NIR) range from 1.75 to 2.5 μm. We employ zinc oxide highly doped with gallium (Ga:ZnO) as the plasmonic constituent material of the metasurfaces and fabricate arrays of orthogonal nanorod pairs. Our Ga:ZnO metasurfaces provide a high degree of circular polarization across a broad range of two distinct optical bands in the NIR. Flexible broad-band tunability of the QWP metasurfaces is achieved by the significant shifts of their optical bands and without any degradation in their performance after a post-annealing process up to 450 °C.
AB - Conventional plasmonic materials, namely, noble metals, hamper the realization of practical plasmonic devices due to their intrinsic limitations, such as lack of capabilities to tune in real-time their optical properties, failure to assimilate with CMOS standards, and severe degradation at increased temperatures. Transparent conducting oxide (TCO) is a promising alternative plasmonic material throughout the near- and mid-infrared wavelengths. In addition to compatibility with established silicon-based fabrication procedures, TCOs provide great flexibility in the design and optimization of plasmonic devices because their intrinsic optical properties can be tailored and dynamically tuned. In this work, we experimentally demonstrate metal oxide metasurfaces operating as quarter-waveplates (QWPs) over a broad near-infrared (NIR) range from 1.75 to 2.5 μm. We employ zinc oxide highly doped with gallium (Ga:ZnO) as the plasmonic constituent material of the metasurfaces and fabricate arrays of orthogonal nanorod pairs. Our Ga:ZnO metasurfaces provide a high degree of circular polarization across a broad range of two distinct optical bands in the NIR. Flexible broad-band tunability of the QWP metasurfaces is achieved by the significant shifts of their optical bands and without any degradation in their performance after a post-annealing process up to 450 °C.
KW - metal oxides
KW - metasurface
KW - plasmonics
KW - quarter-waveplate
KW - semiconductor
KW - surface plasmon resonance
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U2 - 10.1021/acsnano.6b03937
DO - 10.1021/acsnano.6b03937
M3 - Article
C2 - 27704773
AN - SCOPUS:84994027672
VL - 10
SP - 9326
EP - 9333
JO - ACS Nano
JF - ACS Nano
SN - 1936-0851
IS - 10
ER -