Left/right asymmetry in Dyakonov-Tamm-wave propagation guided by a topological insulator and a structurally chiral material

Francesco Chiadini, Vincenzo Fiumara, Tom G. Mackay, Antonio Scaglione, Akhlesh Lakhtakia

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The propagation of Dyakonov-Tamm waves guided by the planar interface of an isotropic topological insulator and a structurally chiral material, both assumed to be nonmagnetic, was investigated by numerically solving the associated canonical boundary-value problem. The topologically insulating surface states of the topological insulator were quantitated via a surface admittance γTI, which significantly affects the phase speeds and the spatial profiles of the Dyakonov-Tamm waves. Most significantly, it is possible that a Dyakonov-Tamm wave propagates co-parallel to a vector u in the interface plane, but no Dyakonov-Tamm wave propagates anti-parallel to u. The left/right asymmetry, which vanishes for γTI = 0, is highly attractive for one-way on-chip optical communication.

Original languageEnglish (US)
Article number115101
JournalJournal of Optics (United Kingdom)
Volume18
Issue number11
DOIs
StatePublished - Nov 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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