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Non-reciprocity and topology in optics: one-way road for light via surface magnon polariton

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ABSTRACT

We show how non-reciprocity and topology are used to construct an optical one-way waveguide in the Voigt geometry. First, we present a traditional approach of the one-way waveguide of light using surface polaritons under a static magnetic field. Second, we explain a recent discovery of a topological approach using photonic crystals with the magneto-optical coupling. Third, we present a combination of the two approaches, toward a broadband one-way waveguide in the microwave range.

No MeSH data available.


The dispersion relation of the surface plasmon polariton under a static magnetic field along the z direction. Just to visualize the one-way band, whose upper and lower frequencies are indicated by the dotted lines (), we assume . Actually, , so that the one-way band width is almost invisible, if plotted in actual scale.
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Figure 2: The dispersion relation of the surface plasmon polariton under a static magnetic field along the z direction. Just to visualize the one-way band, whose upper and lower frequencies are indicated by the dotted lines (), we assume . Actually, , so that the one-way band width is almost invisible, if plotted in actual scale.

Mentions: Let us consider the surface plasmon polariton localized around the flat interface between metal and dielectric. This geometry supports a localized mode of the radiation field near the surface, irrespective of the applied magnetic field. That is, the surface plasmon polariton. The dispersion relation of the surface plasmon polariton under the magnetic field is given by789where we assume the metal has the off-diagonal permittivity of equation (3) with and , and the diagonal permeability . The dielectric has diagonal permittivity and permeability . The dynamical magnetic field of the surface plasmon polariton is polarized in the z direction. Figure 2 shows the dispersion relation of the surface plasmon polariton under a static magnetic field.


Non-reciprocity and topology in optics: one-way road for light via surface magnon polariton
The dispersion relation of the surface plasmon polariton under a static magnetic field along the z direction. Just to visualize the one-way band, whose upper and lower frequencies are indicated by the dotted lines (), we assume . Actually, , so that the one-way band width is almost invisible, if plotted in actual scale.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5036484&req=5

Figure 2: The dispersion relation of the surface plasmon polariton under a static magnetic field along the z direction. Just to visualize the one-way band, whose upper and lower frequencies are indicated by the dotted lines (), we assume . Actually, , so that the one-way band width is almost invisible, if plotted in actual scale.
Mentions: Let us consider the surface plasmon polariton localized around the flat interface between metal and dielectric. This geometry supports a localized mode of the radiation field near the surface, irrespective of the applied magnetic field. That is, the surface plasmon polariton. The dispersion relation of the surface plasmon polariton under the magnetic field is given by789where we assume the metal has the off-diagonal permittivity of equation (3) with and , and the diagonal permeability . The dielectric has diagonal permittivity and permeability . The dynamical magnetic field of the surface plasmon polariton is polarized in the z direction. Figure 2 shows the dispersion relation of the surface plasmon polariton under a static magnetic field.

View Article: PubMed Central - PubMed

ABSTRACT

We show how non-reciprocity and topology are used to construct an optical one-way waveguide in the Voigt geometry. First, we present a traditional approach of the one-way waveguide of light using surface polaritons under a static magnetic field. Second, we explain a recent discovery of a topological approach using photonic crystals with the magneto-optical coupling. Third, we present a combination of the two approaches, toward a broadband one-way waveguide in the microwave range.

No MeSH data available.