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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 in the ferrite photonic crystal. The same parameters as in figure 7 are employed. As in figure 6, we assume a semi-infinite ferrite material with the periodic hole array of the triangular lattice, in the vicinity of the material edge. The region outside the ferrite material is air. The hole array has 16 layers along the Γ−M direction. The distance between the boundary hole layer and the flat interface is . The edge states shown are localized around the flat interface. Those localized near the opposite-boundary hole layer are not observed.
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Figure 8: The dispersion relation of the edge states in the ferrite photonic crystal. The same parameters as in figure 7 are employed. As in figure 6, we assume a semi-infinite ferrite material with the periodic hole array of the triangular lattice, in the vicinity of the material edge. The region outside the ferrite material is air. The hole array has 16 layers along the Γ−M direction. The distance between the boundary hole layer and the flat interface is . The edge states shown are localized around the flat interface. Those localized near the opposite-boundary hole layer are not observed.

Mentions: The dispersion curve of the edge states is shown in figure 8. Each dot represents a peak in the optical density of states as a function of parallel momentum kx to the boundary. All peaks are plotted irrespective of their peak widths. Most peaks are inside the light cone of either the air side or ferrite side. Therefore, the peaks correspond to quasi-guided edge states, which can couple with incident light. The peaks form the dispersion curves of the edge states. We can find several vacancies in the dispersion curves, because the relevant peaks become broad, or merge with the singularity of the Wood anomaly (found in the diffraction thresholds).


Non-reciprocity and topology in optics: one-way road for light via surface magnon polariton
The dispersion relation of the edge states in the ferrite photonic crystal. The same parameters as in figure 7 are employed. As in figure 6, we assume a semi-infinite ferrite material with the periodic hole array of the triangular lattice, in the vicinity of the material edge. The region outside the ferrite material is air. The hole array has 16 layers along the Γ−M direction. The distance between the boundary hole layer and the flat interface is . The edge states shown are localized around the flat interface. Those localized near the opposite-boundary hole layer are not observed.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 8: The dispersion relation of the edge states in the ferrite photonic crystal. The same parameters as in figure 7 are employed. As in figure 6, we assume a semi-infinite ferrite material with the periodic hole array of the triangular lattice, in the vicinity of the material edge. The region outside the ferrite material is air. The hole array has 16 layers along the Γ−M direction. The distance between the boundary hole layer and the flat interface is . The edge states shown are localized around the flat interface. Those localized near the opposite-boundary hole layer are not observed.
Mentions: The dispersion curve of the edge states is shown in figure 8. Each dot represents a peak in the optical density of states as a function of parallel momentum kx to the boundary. All peaks are plotted irrespective of their peak widths. Most peaks are inside the light cone of either the air side or ferrite side. Therefore, the peaks correspond to quasi-guided edge states, which can couple with incident light. The peaks form the dispersion curves of the edge states. We can find several vacancies in the dispersion curves, because the relevant peaks become broad, or merge with the singularity of the Wood anomaly (found in the diffraction thresholds).

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.