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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 magnon polariton under a static magnetic field along the z direction. The lower and upper frequencies of the one-way band are indicated by the dotted lines ( and , respectively). We assume .
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Figure 3: The dispersion relation of the surface magnon polariton under a static magnetic field along the z direction. The lower and upper frequencies of the one-way band are indicated by the dotted lines ( and , respectively). We assume .

Mentions: The dispersion relation of the surface magnon polariton is obtained by solving the secular equation1314where we assume the ferrite has the non-diagonal permeability of equation (10) with and , and the diagonal permittivity . The dynamical electric field of the surface magnon polariton is polarized in the z direction. In the non-retardation limit , we obtain the surface magnon (magneto-static Damon–Eshbach wave [13]) whose frequency is available only for . For the surface magnon is not allowed to exist. The dispersion relation of the surface magnon polariton is shown in figure 3. The dispersion relation is clearly non-reciprocal and exhibits a one-way propagation in the frequency range .


Non-reciprocity and topology in optics: one-way road for light via surface magnon polariton
The dispersion relation of the surface magnon polariton under a static magnetic field along the z direction. The lower and upper frequencies of the one-way band are indicated by the dotted lines ( and , respectively). We assume .
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: The dispersion relation of the surface magnon polariton under a static magnetic field along the z direction. The lower and upper frequencies of the one-way band are indicated by the dotted lines ( and , respectively). We assume .
Mentions: The dispersion relation of the surface magnon polariton is obtained by solving the secular equation1314where we assume the ferrite has the non-diagonal permeability of equation (10) with and , and the diagonal permittivity . The dynamical electric field of the surface magnon polariton is polarized in the z direction. In the non-retardation limit , we obtain the surface magnon (magneto-static Damon–Eshbach wave [13]) whose frequency is available only for . For the surface magnon is not allowed to exist. The dispersion relation of the surface magnon polariton is shown in figure 3. The dispersion relation is clearly non-reciprocal and exhibits a one-way propagation in the frequency range .

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.