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

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.


The dispersion relation of the edge states found in the photonic crystal edge normal to the Γ−M direction. The projected band diagram in the bulk is also plotted. The gapped photonic crystal with the same parameters as in figure 4 is employed. To clarify the edge states, we place a (perfect conductor) metal cladding away from the boundary layer with distance (.
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Figure 5: The dispersion relation of the edge states found in the photonic crystal edge normal to the Γ−M direction. The projected band diagram in the bulk is also plotted. The gapped photonic crystal with the same parameters as in figure 4 is employed. To clarify the edge states, we place a (perfect conductor) metal cladding away from the boundary layer with distance (.

Mentions: Figure 5 shows the dispersion relation of the edge states in the gapped system. We can see that in the band gap around , the dispersion curve of the edge states traverses the gap and connects the K and K’ valleys of the gaped Dirac cones. As a result, the one-way transmission band is formed in the gap. We should recall that the gap opening is due to the nonzero magneto-optical coupling κ. The gap width is proportional to κ in the degenerate perturbation around the Dirac point. The proportional constant reflects the properties of the degenerate mode at the Dirac point. Thus, the one-way band width there can be controlled by a photonic-band-mode design.


Non-reciprocity and topology in optics: one-way road for light via surface magnon polariton
The dispersion relation of the edge states found in the photonic crystal edge normal to the Γ−M direction. The projected band diagram in the bulk is also plotted. The gapped photonic crystal with the same parameters as in figure 4 is employed. To clarify the edge states, we place a (perfect conductor) metal cladding away from the boundary layer with distance (.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: The dispersion relation of the edge states found in the photonic crystal edge normal to the Γ−M direction. The projected band diagram in the bulk is also plotted. The gapped photonic crystal with the same parameters as in figure 4 is employed. To clarify the edge states, we place a (perfect conductor) metal cladding away from the boundary layer with distance (.
Mentions: Figure 5 shows the dispersion relation of the edge states in the gapped system. We can see that in the band gap around , the dispersion curve of the edge states traverses the gap and connects the K and K’ valleys of the gaped Dirac cones. As a result, the one-way transmission band is formed in the gap. We should recall that the gap opening is due to the nonzero magneto-optical coupling κ. The gap width is proportional to κ in the degenerate perturbation around the Dirac point. The proportional constant reflects the properties of the degenerate mode at the Dirac point. Thus, the one-way band width there can be controlled by a photonic-band-mode design.

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.