30 August 2017 Asymmetries in surface waves and reflection/transmission characteristics associated with topological insulators
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Abstract
Three numerical studies were undertaken involving the interactions of plane waves with topological insulators. In each study, the topologically insulating surface states of the topological insulator were represented through a surface admittance. Canonical boundary-value problems were solved for the following cases: (i) Dyakonov surface-wave propagation guided by the planar interface of a columnar thin film and an isotropic dielectric topological insulator; (ii) Dyakonov–Tamm surface-wave propagation guided by the planar interface of a structurally chiral material and an isotropic dielectric topological insulator; and (iii) reflection and transmission due to the planar interface of a topologically insulating columnar thin film and vacuum. The nonzero surface admittance resulted in asymmetries in the wave speeds and decay constants of the surface waves in studies (i) and (ii). The nonzero surface admittance resulted in asymmetries in the reflectances and transmittances in study (iii).
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Tom G. Mackay, Tom G. Mackay, Francesco Chiadini, Francesco Chiadini, Vincenzo Fiumara, Vincenzo Fiumara, Antonio Scaglione, Antonio Scaglione, Akhlesh Lakhtakia, Akhlesh Lakhtakia, } "Asymmetries in surface waves and reflection/transmission characteristics associated with topological insulators", Proc. SPIE 10356, Nanostructured Thin Films X, 103560H (30 August 2017); doi: 10.1117/12.2271940; https://doi.org/10.1117/12.2271940
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