Topological beam-splitting in photonic crystals.

@article{Makwana2019TopologicalBI,
  title={Topological beam-splitting in photonic crystals.},
  author={Mehul P. Makwana and Richard V. Craster and S{\'e}bastien Guenneau},
  journal={Optics express},
  year={2019},
  volume={27 11},
  pages={
          16088-16102
        }
}
We create a passive wave splitter, created purely by geometry, to engineer three-way beam splitting in electromagnetism in transverse electric and magnetic polarisation. We do so by considering arrangements of Indium Phosphide dielectric pillars in air, in particular we place several inclusions within a cell that is then extended periodically upon a square lattice. Hexagonal lattice structures are more commonly used in topological valleytronics but, as we discuss, three-way splitting is only… 

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References

SHOWING 1-10 OF 51 REFERENCES

Analysis of splitters for self-collimated beams in planar photonic crystals.

Methods for beam splitting in a planar photonic crystal, where the light is self-guided as dictated by the selfcollimation phenomenon, are presented and the first one-to-three splitter in a self-guiding planar Photonic crystal is presented.

Tunable three-way topological energy-splitter

The geometrical construction of the structured medium allows for the three-way splitter to be adiabatically converted into a wave steerer around sharp bends, and these results have far-reaching implications for applications such as beam-splitters, switches and filters across wave physics.

Two-dimensional topological photonics

Originating from the studies of two-dimensional condensed-matter states, the concept of topological order has recently been expanded to other fields of physics and engineering, particularly optics

Tunable three-way valley Hall energy-splitter: venturing beyond graphene-like structures

Strategically combining four structured domains creates the first ever three-way topological energy-splitter; remarkably, this is only possible using a square, or rectangular, lattice, and not the

Bends and splitters for self-collimated beams in photonic crystals

We present finite-difference time-domain studies for self-collimated beams in photonic crystal structures. Using a pulse propagation technique that eliminates the interference from the boundary of

Photonic-crystal-based beam splitters

We proposed and demonstrated two different methods to split electromagnetic waves in three-dimensional photonic crystals. By measuring transmission spectra, it was shown that the guided mode in a

Self-guiding in two-dimensional photonic crystals.

Dielectric periodic media can possess a complex photonic band structure with allowed bands displaying strong dispersion and anisotropy. We show that for some frequencies the form of iso-frequency

Robust topologically protected transport in photonic crystals at telecommunication wavelengths

It is shown that the transmittances are the same for light propagation along a straight topological interface and one with four sharp turns, which quantitatively demonstrates the suppression of backscattering due to the non-trivial topology of the structure.

The Emergence of Dirac points in Photonic Crystals with Mirror Symmetry

It is shown that Dirac points can emerge in photonic crystals possessing mirror symmetry when band gap closes, and a photonic analog of Chern insulator can be achieved through time reversal symmetry breaking.

Designing multidirectional energy splitters and topological valley supernetworks

Using group theoretic and topological concepts, together with tunneling phenomena, we geometrically design interfacial wave networks that contain splitters which partition energy in 2, 3, 4 or 5
...