Comparative analysis of Dyakonov hybrid surface waves at dielectric–elliptic and dielectric–hyperbolic media interfaces

Abstract

We comparatively investigate Dyakonov surface waves (DSWs) traveling along the plane interface between a dielectric isotropic medium and a lossless anisotropic uniaxial medium with the optic axis (OA) parallel to the interface, when the principal permittivities of the uniaxial medium are both positive (elliptic medium) and of opposite signs (hyperbolic medium). New insights concerning the DSWs are given by analyzing the behavior of the Poynting vector (PV) components. Thus, singularity points at which the PV of the DSW vanishes can exist at the dielectric-elliptic media interface. The range of angles with respect to the OA, which is determined both for the wave vector and the respective PV, can be larger for the DSWs at the dielectric-hyperbolic media interface.Extremely high values of the wave vector and the PV components of the DSWs can be attained at the dielectrichyperbolic media interface.

Dyakonov surface waves at the interface between hexagonal-boron-nitride and isotropic material

“…7, it is also found that the dielectric-hyperbolic type interface could cause a much obvious difference in the composition ratio between the two evanescent modes in either the h-BN crystal or the isotropic dielectric material. The performances of DSWs at h-BN surface are also different to those in previous paper [24]. Firstly, the operation wavelength of DSWs at dielectric-elliptic or dielectric-hyperbolic type interface stays within the far-infrared wavelength region (12.9 µm<λ<13.3 µm) or mid-infrared wavelength region (6.3 µm<λ<7.2 µm).…”

“…1(b)]. In addition, an optimized permittivity of isotropic dielectric material exists for every wavenumber with the similar phenomenon has been observed in previous theoretical study [24]. Thus in experimental study of DSWs, the permittivity of the isotropic material should be carefully selected.…”

“…1(b), two categories of relationships between ε || and ε ⊥ can be found in elliptical dispersion region, namely ε || > ε ⊥ > 0 (746 cm ). Based on the previous study [13,24], for the anisotropic material with elliptical dispersions, the DSWs only exist at the dielectric-elliptic interface under ε || > ε d > ε ⊥ and once the isotropic material is with hyperbolic dispersions, the dielectric-hyperbolic interface supports the propagation of DSWs under -ε ⊥ *>ε d >0, regardless of -ε ⊥ *>ε || or -ε ⊥ *<ε || . Therefore, in this paper, we only focus on the two most representative frequency regions, 750 cm It is well known that the DSWs are hybrid modes with the polarization hybridization involves four evanescent fields, two field modes corresponding to both transverse-magnetic (TM) and transverse-electric (TE) waves in isotropic dielectric and the other two field modes corresponding to the ordinary and extraordinary modes in h-BN crystal.…”

“…(4) depends on the precondition of k e ≠ k o . Once it fails, there may be a singularity point in the dispersion space, corresponding to the direction angle of φ sp , which can be obtained by letting k e = k o [24], 2 3 cos / ,…”

Nanoimaging of resonating hyperbolic polaritons in linear boron nitride antennas

“…By full-wave simulations we perform a comprehensive analysis of both the experimental images and near-field spectra. We show that the resonances and exotic near-field patterns are governed, interestingly, by hyperbolic surface phonon–polaritons (Dyakonov polaritons2728293031) rather than volume phonon–polaritons.…”