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Enhanced mid-infrared absorption by coupled surface plasmon-phonon polariton resonances in Fabry-Perot nanocavity array

ORAL

Abstract

Resonant optical cavity is an essential component to enhance a coupling of light and the sub-wavelength scale resonator. We experimentally demonstrate subwavelength-scale resonant nanocavity arrays which have highly enhanced absorption spectrum in the mid-infrared via coupled surface plasmon-phonon polariton resonances. The metal-insulator-polar dielectric structure supports a guided mode in the lateral direction while vertically confining the mid-infrared wave (10 – 12 micro-meter wavelength) within an 80 nm thick dielectric spacer. The metal (Au)-insulator (Si) aperture array on polar dielectric (SiC) crystal form Fabry-Perot cavity array. The resonance appears at half-wave Fabry-Perot resonance condition of the coupled surface plasmon-phonon polariton mode. Our cavity arrays exhibit broadband, angle-insensitive, and frequency-tunable absorption up to 80% of the optical power and should benefit polariton-based mid-infrared applications. This work was performed, in part, at the Center for Integrated Nanotechnologies, an office of Science User Facility operated for the U. S. Department of Energy (DOE), Office of Science by Los Alamos National Laboratory (Contract 89233218CNA000001) and Sandia National Laboratories (Contract DE-NA-0003525).

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Presenters

  • MyoungHwan Kim

    Texas Tech University

Authors

  • MyoungHwan Kim

    Texas Tech University

  • SATYANARAYANA R KACHIRAJU

    Department of Physics and Astronomy, The University of Texas Rio Grande Valley, Department of Physics and Astronomy, Texas Tech University, Department of Physics and Astronomy, Texas Tech University, Lubbock, TX 79409, USA Department of Physics and Astronomy, The University of Texas Rio Grande Valley, Brownsville, Department of Physics and Astronomy, Texas Tech University, Lubbock, TX 79409, USA., Department of Physics and Astronomy, The University of Texas Rio Grande Valley, Edinburg, University of Texas Rio Grande Valley

  • Ivan Nekrashevich

    Los Alamos National Laboratory, Los Alamos, NM 87545, USA Department of Integrated Bio & Nano Systems, University of Houston, Houston, TX 77204, USA, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, Superconducting Quantum Materials and Systems Center (SQMS), Fermilab, Los Alamos Natl Lab

  • Imtiaz Ahmad

    Department of Physics and Astronomy, Texas Tech University, Lubbock, TX 79409, USA, Department of Physics and Astronomy, Texas Tech University

  • Hira Farooq

    Texas Tech Univ, Department of Physics and Astronomy, Texas Tech University, Lubbock, TX 79409, USA

  • Long Chang

    Department of Integrated Bio & Nano Systems, University of Houston, Department of Integrated Bio & Nano Systems, University of Houston, Houston, TX 77204, USA, Department of Integrated Bio & Nano Systems, Univ. of Houston, Houston, TX 77204, USA

  • Sangsik Kim

    Texas Tech Univ