Coupling of epsilon-near-zero and plasmonic modes in ALD-AZO coated nanoantenna array

ORAL

Abstract

Recently, there has been a revival of the interests in the optical properties of materials near their Epsilon-near-zero (ENZ) (real part of material permittivity crosses zero) regions. By integrating ENZ thin films into plasmonic nanoantenna arrays, hybrid ENZ-plasmonic systems can be formed. Most of the hybrid systems reported so far include ENZ thin film layers as substrates, which restrict the control of the coupling strength. Here, we study the optical response of gold nanoantenna arrays conformally coated with ENZ Al-doped zinc oxide (AZO) thin films. We grow the AZO nano-layers on top of gold nanoantennae by using the atomic layer deposition (ALD) technique. Both the simulated (finite-difference-time-domain) and the measured transmission spectra show resonance splitting due to the coupling between the localized surface plasmon and the Ferrell-Berreman modes. These plasmonic antenna arrays with ENZ AZO conformal coatings can support novel hybrid plasmonic-ENZ modes and may pave a way towards a completely new type of plasmonic devices.

*This work is supported by the Young Faculty Award Program from Defense Advanced Research Projects Agency (grant no. N66001-17-1-4047), the Young Investigator Development Program and the Office of Vice Provost for Research at Baylor University.

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Presenters

  • Subhajit Bej

    • Department of Physics and Baylor Research and Innovation Collaborative (BRIC), Baylor University, Waco, TX 76798, United States
    • Department of Physics, Baylor University, One Bear Place #97316, Waco, TX 76798
    • Department of Physics, Baylor University, Waco, TX 76798, United States

Authors

  • Subhajit Bej

    • Department of Physics and Baylor Research and Innovation Collaborative (BRIC), Baylor University, Waco, TX 76798, United States
    • Department of Physics, Baylor University, One Bear Place #97316, Waco, TX 76798
    • Department of Physics, Baylor University, Waco, TX 76798, United States

  • Sudip Gurung

    • Department of Physics and Baylor Research and Innovation Collaborative (BRIC), Baylor University, Waco, TX 76798, United States
    • Baylor University
    • Department of Physics, Baylor University, Waco, TX 76798, United States

  • Aleksei Anopchenko

    • Department of Physics and Baylor Research and Innovation Collaborative (BRIC), Baylor University, Waco, TX 76798, United States, Department of Physics and Baylor Research and
    • Baylor University
    • Department of Physics, Baylor University, One Bear Place #97316, Waco, TX 76798
    • Department of Physics, Baylor University, Waco, TX 76798, United States

  • Brian Ko

    • Baylor Univ
    • Department of Physics, Baylor University, Waco, TX 76798, United States

  • Howard Ho Wai Lee

    • Baylor Univ, Texas A&M Univ
    • Department of Physics and Baylor Research and Innovation Collaborative (BRIC), Baylor University, Waco, TX 76798, United States, The Institute for Quantum Science and Enginee
    • Baylor University
    • Department of Physics, Baylor University, One Bear Place #97316, Waco, TX 76798, Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 778
    • Department of Physics, Baylor University, Waco, TX 76798, United States, The Institute for Quantum Science and Engineering, Texas A&M University College Station, TX 77843, Un