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arXiv · 1811.08326

Photonic Jackiw-Rebbi states in all-dielectric structures controlled by bianisotropy

Alexey A. Gorlach·Dmitry V. Zhirihin·Alexey P. Slobozhanyuk·Alexander B. Khanikaev·Maxim A. Gorlach
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Abstract

Electric and magnetic resonances of dielectric particles have recently uncovered a range of exciting applications in steering of light at the nanoscale. Breaking of particle inversion symmetry further modifies its electromagnetic response giving rise to bianisotropy known also as magneto-electric coupling. Recent studies suggest the crucial role of magneto-electric coupling in realization of photonic topological metamaterials. To further unmask this fundamental link, we design and test experimentally one-dimensional array composed of dielectric particles with overlapping electric and magnetic resonances and broken mirror symmetry. Flipping over half of the meta-atoms in the array, we observe the emergence of interface states providing photonic realization of the celebrated Jackiw-Rebbi model. We trace the origin of these states to the fact that local modification of particle bianisotropic response affects its effective coupling with the neighboring meta-atoms which provides a promising avenue to engineer topological states of light.

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Alexey A. Gorlach, Dmitry V. Zhirihin, Alexey P. Slobozhanyuk, Alexander B. Khanikaev, Maxim A. Gorlach. 2019-03-13. Photonic Jackiw-Rebbi states in all-dielectric structures controlled by bianisotropy. https://doi.org/10.1103/physrevb.99.205122

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