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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 photonic band structure of the transverse-magnetic polarization in the triangular array of circular holes with radius  in a ferrite material. The following parameters are assumed for the ferrite material: ,  and . The polariton gap of the background ferrite material ranges from
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Figure 7: The photonic band structure of the transverse-magnetic polarization in the triangular array of circular holes with radius in a ferrite material. The following parameters are assumed for the ferrite material: , and . The polariton gap of the background ferrite material ranges from

Mentions: Let us consider the hole array of the triangular lattice embedded in a ferrite material. The lattice constant is chosen such that with . The photonic band structure of the bulk hole-array system is shown in figure 7. Since the periodic modulation by the hole array is very strong, many photonic-band gaps are formed particularly above . The photonic bands in this region are not necessarily topological, because the bands are separated not simply by the magneto-optical coupling. Rather, the periodic modulation in the permittivity with a large contrast seems to play a major role in the gap formation. For comparison, the polariton gap of the homogeneous ferrite material ranges from . Just below the gap, a dense band region is found. This is because the refractive index of the ferrite becomes so large there.


Non-reciprocity and topology in optics: one-way road for light via surface magnon polariton
The photonic band structure of the transverse-magnetic polarization in the triangular array of circular holes with radius  in a ferrite material. The following parameters are assumed for the ferrite material: ,  and . The polariton gap of the background ferrite material ranges from
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 7: The photonic band structure of the transverse-magnetic polarization in the triangular array of circular holes with radius in a ferrite material. The following parameters are assumed for the ferrite material: , and . The polariton gap of the background ferrite material ranges from
Mentions: Let us consider the hole array of the triangular lattice embedded in a ferrite material. The lattice constant is chosen such that with . The photonic band structure of the bulk hole-array system is shown in figure 7. Since the periodic modulation by the hole array is very strong, many photonic-band gaps are formed particularly above . The photonic bands in this region are not necessarily topological, because the bands are separated not simply by the magneto-optical coupling. Rather, the periodic modulation in the permittivity with a large contrast seems to play a major role in the gap formation. For comparison, the polariton gap of the homogeneous ferrite material ranges from . Just below the gap, a dense band region is found. This is because the refractive index of the ferrite becomes so large there.

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.