Journal
OPTICA
Volume 3, Issue 3, Pages 339-346Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.3.000339
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Funding
- Office of Naval Research (ONR) [N00014-10-1-0942]
- Air Force Office of Scientific Research (AFOSR) [FA9550-14-1-0389]
- NRC/ASEE Postdoctoral Fellowship Naval Research Laboratory Nanoscience Institute (ONR)
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Radiation patterns and the resonance wavelength of a plasmonic antenna are significantly influenced by its local environment, particularly its substrate. Here, we experimentally explore the role of dispersive substrates, such as aluminum-or gallium-doped zinc oxide in the near infrared and 4H-silicon carbide in the mid-infrared, upon Au plasmonic antennas, extending from dielectric to metal-like regimes, crossing through epsilon-near-zero (ENZ) conditions. We demonstrate that the vanishing index of refraction within this transition induces a slowing down of the rate of spectral shift for the antenna resonance frequency, resulting in an eventual pinning of the resonance near the ENZ frequency. This condition corresponds to a strong backward emission with near-constant phase. By comparing heavily doped semiconductors and undoped, polar dielectric substrates with ENZ conditions in the near- and mid-infrared, respectively, we also demonstrate the generality of the phenomenon using both surface plasmon and phonon polaritons, respectively. Furthermore, we also show that the redirected antenna radiation induces a Fano-like interference and an apparent stimulation of optic phonons within SiC. (C) 2016 Optical Society of America
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