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Magneto-optical effects in hyperbolic metamaterials.

I A Kolmychek, A R Pomozov, A P Leontiev

    Optics Letters
    |August 15, 2018
    PubMed
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    Highly anisotropic nanostructures exhibit unique optical properties. Nickel-containing hyperbolic metamaterials show enhanced magneto-optical effects near epsilon-near-zero (ENZ) and epsilon-near-pole (ENP) points due to local field enhancement.

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    Area of Science:

    • Materials Science
    • Optics
    • Nanotechnology

    Background:

    • Anisotropic metal-dielectric structures exhibit unique optical properties.
    • Hyperbolic metamaterials display distinct dispersion characteristics, including epsilon-near-zero (ENZ) and epsilon-near-pole (ENP) points.
    • Magneto-optical effects in metamaterials are of interest for novel optical devices.

    Purpose of the Study:

    • To experimentally investigate the linear optical and magneto-optical response of plasmonic nanorod arrays and nickel-containing nanocomposites.
    • To explore the influence of ENZ and ENP points on the optical and magneto-optical properties of these structures.
    • To understand the role of local field enhancement in magnetic hyperbolic metamaterials.

    Main Methods:

    • Fabrication and characterization of highly anisotropic metal-dielectric structures (plasmonic gold nanorods and Ni-containing nanocomposites).
    • Experimental measurement of linear optical properties (transmission, reflection).
    • Experimental measurement of magneto-optical response (e.g., Kerr rotation,!”, Faraday rotation) in transmission.

    Main Results:

    • Both gold nanorod arrays and Ni-containing structures exhibited optical features characteristic of hyperbolic media.
    • Distinct optical features associated with ENZ and ENP points were observed.
    • Linear magneto-optical effects were observed in transmission through Ni-containing nanocomposites.
    • Magneto-optical effects were found to increase in the vicinity of ENZ and ENP points.

    Conclusions:

    • Highly anisotropic structures can act as hyperbolic metamaterials with tunable optical properties.
    • Local field enhancement near ENZ and ENP points plays a crucial role in enhancing magneto-optical activity in magnetic hyperbolic metamaterials.
    • These findings open possibilities for developing novel magneto-optical devices based on hyperbolic metamaterials.