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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.


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The photonic band structure of the transverse-magnetic polarization in the triangular array of circular ferrite rods with (solid curve) and without (dashed curve) the applied static magnetic field parallel to the rods. The background medium is air. The rod permittivity is taken to be , and the rod radius is , where a is the lattice constant. As for the rod permeability, we assume  and  for the system without the magnetic field. For the system with the magnetic field, we assume dispersion-free values of ,  as an approximation. These values are taken from those of equations (11) and (12) at , provided .
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Figure 4: The photonic band structure of the transverse-magnetic polarization in the triangular array of circular ferrite rods with (solid curve) and without (dashed curve) the applied static magnetic field parallel to the rods. The background medium is air. The rod permittivity is taken to be , and the rod radius is , where a is the lattice constant. As for the rod permeability, we assume and for the system without the magnetic field. For the system with the magnetic field, we assume dispersion-free values of , as an approximation. These values are taken from those of equations (11) and (12) at , provided .

Mentions: Figure 4 shows the photonic band structure of the system before and after introducing the magneto-optical coupling. We can see the band gap opening of the Dirac cone, suggesting a nontrivial topology in the gapped system. In fact, the Chern numbers of the bands are evaluated as 0 (lowest, not shown), −1 (2nd), and 2 (3rd).


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 ferrite rods with (solid curve) and without (dashed curve) the applied static magnetic field parallel to the rods. The background medium is air. The rod permittivity is taken to be , and the rod radius is , where a is the lattice constant. As for the rod permeability, we assume  and  for the system without the magnetic field. For the system with the magnetic field, we assume dispersion-free values of ,  as an approximation. These values are taken from those of equations (11) and (12) at , provided .
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: The photonic band structure of the transverse-magnetic polarization in the triangular array of circular ferrite rods with (solid curve) and without (dashed curve) the applied static magnetic field parallel to the rods. The background medium is air. The rod permittivity is taken to be , and the rod radius is , where a is the lattice constant. As for the rod permeability, we assume and for the system without the magnetic field. For the system with the magnetic field, we assume dispersion-free values of , as an approximation. These values are taken from those of equations (11) and (12) at , provided .
Mentions: Figure 4 shows the photonic band structure of the system before and after introducing the magneto-optical coupling. We can see the band gap opening of the Dirac cone, suggesting a nontrivial topology in the gapped system. In fact, the Chern numbers of the bands are evaluated as 0 (lowest, not shown), −1 (2nd), and 2 (3rd).

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.


Related in: MedlinePlus