Direct Magnetic Resonances with Infrared Light from Plasmonic Single Closed Ring Resonators

ORAL

Abstract

We report here a spectroscopic study on plasmonic ring resonators at grazing angle incidence. With the magnetic component of the infrared light perpendicular to the ring plane (TM), we successfully observed a strong resonance signal at Mid- to Near-IR frequencies. Comparing to simulations, we identify that this signal is due to the resonance of the TM wave with the surface plasmon propagation of the metal rings. We provide a solution to measure direct magnetic resonance by using a grazing incidence objective on a FTIR microscope. We also demonstrate a method to realize magnetic resonance at optical frequencies by channeling the surface plasmon in a closed metallic ring.

*This work was supported by the Director, Office of Science, of the U.S. Department of Energy.

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Authors

  • Zhao Hao

    • Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, California 94720

  • Michael C. Martin

    • Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, California 94720

  • Bruce Harteneck

    • Center of X-Ray Optics and Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, California 94720

  • Stefano Cabrini

    • Center of X-Ray Optics and Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, California 94720

  • Erik H. Anderson

    • Center of X-Ray Optics and Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, California 94720

  • Willie J. Padilla

    • Department of Physics, Boston College, 140 Commonwealth Ave., Chestnut Hill, MA 02467