Size and host-medium effects on topologically protected surface states in bi-anisotropic 3D optical waveguides
Vasily Klimov
Lebedev Physical Institute
Prof. Vasily Klimov is author of 165 publications and 6 book chapters. In 2009, he issued a book “Nanoplasmonics” that was published in several international editions. His fields of interest includes quantum electrodynamics, nano-optics, metamaterials and metasurfaces, quantum and classical optics. His main research achievements include: 1) theory of QCD at high temperatures and densities, 2) theory of coherent emission from carbon nanotubes, 3) theory of spontaneous emission of atoms and molecules near nanoparticles, 4) theory of plasmonic properties of nanoparticles, 5) theory of focusing light and matter waves by negative refraction, 6) theory of topological protection breaking in photonics.
Abstract
Development of chip to chip optical interconnects is of great importance for reducing the energy consumption of heavy computations. Now it is widely believed that optical nanowaveguides with topologically protected... [ view full abstract ]
Development of chip to chip optical interconnects is of great importance for reducing the energy consumption of heavy computations. Now it is widely believed that optical nanowaveguides with topologically protected surface states can help to achieve this goal. This is rather complicated from physical point of view and most of researchers deal with simplified geometries of waveguides which are far from practical. We study [1] the optical properties of 3D bi-anisotropic optical waveguides with nontrivial topological structure in wavevector space, placed in an ordinary dielectric matrix. We derive an exact analytical description of the eigenmodes of the systems with arbitrary parameters that allows us to investigate topologically protected surface states (TPSS) in details. In particular, we have found that the TPSS in the waveguides would disappear if their radius is smaller than a critical radius due to the dimensional quantization of azimuthal wavenumber (see Fig.1), and also (2) if the permittivity of the host-medium exceeds a critical value.
Fig.1. TPSS positions for the bi-anisotropic waveguides with different radii ( black crosses) together with equifrequency curves of bulk bi-anisotropic medium (solid black lines). Fig.1a: k0R=5, Fig.1b: k0R=2.5, Fig.1c: k0R=0.5 . Note that when k0R ≤0.5 there are no TPSS at all.
Interestingly, we also find that the TPSS in the waveguides have negative refraction for some geometries. We have found a TPSS phase diagram that will pave the way for development of the topological waveguides for optical interconnects and devices. Our results rise the general question about domains of applicability of topological protection and bulk-edge correspondence in topological photonics.
Reference:
[1] V. V. Klimov, D. V. Guzatov, I. V. Zabkov, H.-C. Chan, and G.-Y. Guo, Size and host-medium effects on topologically protected surface states in bi-anisotropic 3D waveguides, Phys. Rev. B 98 (2018) 075433
Authors
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Vasily Klimov
(Lebedev Physical Institute)
Topic Areas
Photonic & plasmonic nanomaterials , Optical properties of nanostructures , Metamaterials
Session
OS1b-A » Metamaterials (17:05 - Monday, 1st October, AUDITORIUM)
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