Suppression of near-field coupling in plasmonic antennas on epsilon-near-zero substrates
Abstract
Epsilon-near-zero (ENZ) media are an emerging class of nanophotonic materials that 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 μm. Using near-field microscopy, far-field spectroscopy, finite-element numerical simulations, and a semi-analytic Fabry–Perot (FP) model, we show that single nanoantennas support highly dispersive plasmonic modes with less than unity effective mode index at wavelengths greater than the ENZ wavelength, which consequently 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 structuresmore »
- Authors:
- Publication Date:
- Research Org.:
- Purdue Univ., West Lafayette, IN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1484318
- Alternate Identifier(s):
- OSTI ID: 1612749
- Grant/Contract Number:
- SC0017717
- Resource Type:
- Journal Article: Published Article
- Journal Name:
- Optica
- Additional Journal Information:
- Journal Name: Optica Journal Volume: 5 Journal Issue: 12; Journal ID: ISSN 2334-2536
- Publisher:
- Optical Society of America
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Optics
Citation Formats
DeVault, Clayton T., Zenin, Vladimir A., Pors, Anders, Chaudhuri, Krishnakali, Kim, Jongbum, Boltasseva, Alexandra, Shalaev, Vladimir M., and Bozhevolnyi, Sergey I. Suppression of near-field coupling in plasmonic antennas on epsilon-near-zero substrates. United States: N. p., 2018.
Web. doi:10.1364/OPTICA.5.001557.
DeVault, Clayton T., Zenin, Vladimir A., Pors, Anders, Chaudhuri, Krishnakali, Kim, Jongbum, Boltasseva, Alexandra, Shalaev, Vladimir M., & Bozhevolnyi, Sergey I. Suppression of near-field coupling in plasmonic antennas on epsilon-near-zero substrates. United States. https://doi.org/10.1364/OPTICA.5.001557
DeVault, Clayton T., Zenin, Vladimir A., Pors, Anders, Chaudhuri, Krishnakali, Kim, Jongbum, Boltasseva, Alexandra, Shalaev, Vladimir M., and Bozhevolnyi, Sergey I. Tue .
"Suppression of near-field coupling in plasmonic antennas on epsilon-near-zero substrates". United States. https://doi.org/10.1364/OPTICA.5.001557.
@article{osti_1484318,
title = {Suppression of near-field coupling in plasmonic antennas on epsilon-near-zero substrates},
author = {DeVault, Clayton T. and Zenin, Vladimir A. and Pors, Anders and Chaudhuri, Krishnakali and Kim, Jongbum and Boltasseva, Alexandra and Shalaev, Vladimir M. and Bozhevolnyi, Sergey I.},
abstractNote = {Epsilon-near-zero (ENZ) media are an emerging class of nanophotonic materials that 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 μm. Using near-field microscopy, far-field spectroscopy, finite-element numerical simulations, and a semi-analytic Fabry–Perot (FP) model, we show that single nanoantennas support highly dispersive plasmonic modes with less than unity effective mode index at wavelengths greater than the ENZ wavelength, which consequently 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.},
doi = {10.1364/OPTICA.5.001557},
url = {https://www.osti.gov/biblio/1484318},
journal = {Optica},
issn = {2334-2536},
number = 12,
volume = 5,
place = {United States},
year = {2018},
month = {12}
}
Web of Science
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