Suppression of Near-Field Coupling in Plasmonic Antennas on Epsilon-Near-Zero Substrates
Posted on 2018-12-03 - 17:45
Epsilon-near-zero (ENZ) media are an emerging class of nanophotonic materials which engender
electromagnetic fields with small phase variation due to their approximately zero permittivity.
These quasi-static fields facilitate several unique optical properties such as subwavelength
confinement, arbitrary wavefront control, and enhanced light-matter interactions, which
make ENZ materials promising platforms for nanophotonic and plasmonic systems. Here, we
report our analysis of single and dimer nanoantennas deposited on an aluminum-doped zinc
oxide layer with an ENZ wavelength around 1.5 mm. Using near-field microscopy, far-field spectroscopy, finite-element numerical simulations, and a semi-analytic Fabry-Pérot model, we show
that single nanoantennas support highly dispersive plasmonic modes with near-zero effective
mode index, which consequentially fixes the resonance near the ENZ wavelength of the substrate.
Furthermore, we observe a strong reduction in the near-field coupling between dimer
nanoantennas via measurements of the resonance shift as a function of gap size. This reduction
of near-field coupling allows one to design arrays of independently operating antennas with
higher densities and thereby significantly improve the array characteristics, especially when
targeting gradient metasurface implementations. Our results demonstrate the use of ENZ materials
for increasing the versatility and functionality of plasmonic structures and provide foundational
insight into this exotic material phenomenon.
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DeVault, Clayton; Zenin, Vladimir; Pors, Anders; Chaudhuri, Krishnakali; Kim, Jongbum; Boltasseva, Alexandra; et al. (2018). Suppression of Near-Field Coupling in Plasmonic Antennas on Epsilon-Near-Zero Substrates. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4297961.v1
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AUTHORS (8)
CD
Clayton DeVault
VZ
Vladimir Zenin
AP
Anders Pors
KC
Krishnakali Chaudhuri
JK
Jongbum Kim
AB
Alexandra Boltasseva
VS
Vladimir Shalaev
SB
Sergey Bozhevolnyi