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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.


Triangular hole array in a semi-infinite ferrite material. The region outside the material is air.
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Figure 6: Triangular hole array in a semi-infinite ferrite material. The region outside the material is air.

Mentions: The idea is as follows. Suppose we have a periodic hole array in a semi-infinite ferrite material with the flat interface at the edge as shown in figure 6. Depending on the geometry of the hole array, the photonic band structure is formed. Photonic band gaps can be found irrespective of the frequencies of the polariton gap in the ferrite material. These gaps act as new polariton gaps, in which light propagation is not allowed in the bulk. Therefore, the gaps can support ‘new’ surface magnon polaritons around the edge. The new polaritons are also affected by the topology of the photonic bands below the gap, according to the bulk-edge correspondence. Thus, the two approaches discussed in the previous sections are combined, giving us a chance to enhance the bandwidth of the one-way road for light.


Non-reciprocity and topology in optics: one-way road for light via surface magnon polariton
Triangular hole array in a semi-infinite ferrite material. The region outside the material is air.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 6: Triangular hole array in a semi-infinite ferrite material. The region outside the material is air.
Mentions: The idea is as follows. Suppose we have a periodic hole array in a semi-infinite ferrite material with the flat interface at the edge as shown in figure 6. Depending on the geometry of the hole array, the photonic band structure is formed. Photonic band gaps can be found irrespective of the frequencies of the polariton gap in the ferrite material. These gaps act as new polariton gaps, in which light propagation is not allowed in the bulk. Therefore, the gaps can support ‘new’ surface magnon polaritons around the edge. The new polaritons are also affected by the topology of the photonic bands below the gap, according to the bulk-edge correspondence. Thus, the two approaches discussed in the previous sections are combined, giving us a chance to enhance the bandwidth of the one-way road for light.

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.