Abstract
A numerical investigation was undertaken to elucidate the propagation of electromagnetic surface waves guided by the planar interface of two temperature-sensitive materials. One partnering material was chosen to be isotropic and the other to be anisotropic. Both partnering materials were engineered composite materials, based on the temperature-sensitive semiconductor InSb. At low temperatures the anisotropic partnering material is a non-hyperbolic uniaxial material; as the temperature is raised this material becomes a hyperbolic uniaxial material. At low temperatures, a solitary Dyakonov wave propagates along any specific direction in a range of directions parallel to the planar interface. At high temperatures, up to three different surface waves can propagate in certain directions parallel to the planar interface; one of these surface waves propagates with negative phase velocity (NPV). At a fixed temperature, the range of directions for NPV propagation decreases uniformly in extent as the volume fraction of InSb in the isotropic partnering material decreases. At a fixed volume fraction of InSb in the isotropic partnering material, the angular range for NPV propagation varies substantially as the temperature varies.
Highlights
The planar interface of two dissimilar materials can support the propagation of a variety of types of surface wave, even when both partnering materials are homogeneous, non-magnetic and non-magnetoelectric [1]
Up to three different surface waves can propagate in certain directions parallel to the planar interface; one of these surface waves propagates with negative phase velocity (NPV)
Example, (i) the planar interface of a plasmonic material and a dielectric material can guide the propagation of surface-plasmonpolariton (SPP) waves [2]; and (ii) the planar interface of an isotropic dielectric material and an anisotropic dielectric material can guide the propagation of Dyakonov waves [3,4,5,6]
Summary
The planar interface of two dissimilar materials can support the propagation of a variety of types of surface wave, even when both partnering materials (on either side of the interface) are homogeneous, non-magnetic and non-magnetoelectric [1]. Hyperbolic materials [14], as exemplified by an anisotropic dielectric material whose permittivity dyadic has a real part with eigenvalues of opposite signs, are associated with exotic phenomena such as negative refraction [15,16,17] and the closely related phenomenon of negative phase velocity (NPV) [18] Such materials may be exploited in subwavelength imaging [19,20,21], for radiative thermal energy transfer [22, 23], as analogues of curved spacetime [24, 25], and for diffraction gratings capable of directing light into a large number of refraction channels [26], for example. We numerically investigate the propagation of surface waves guided by the interface of two temperature-sensitive partnering materials Both partnering materials are non-magnetic, non-magnetoelectric, and engineered materials, one being isotropic and the other anisotropic.
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