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

5 Citations (Scopus)

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 1 2016

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Wave propagation
wave propagation
asymmetry
insulators
Guided electromagnetic wave propagation
Surface states
Optical communication
Boundary value problems
electrical impedance
boundary value problems
optical communication
chips
propagation
profiles

All Science Journal Classification (ASJC) codes

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

Cite this

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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.",
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Left/right asymmetry in Dyakonov-Tamm-wave propagation guided by a topological insulator and a structurally chiral material. / Chiadini, Francesco; Fiumara, Vincenzo; Mackay, Tom G.; Scaglione, Antonio; Lakhtakia, Akhlesh.

In: Journal of Optics (United Kingdom), Vol. 18, No. 11, 115101, 01.11.2016.

Research output: Contribution to journalArticle

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AU - Chiadini, Francesco

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