Tantalum Arsenide-Based One-Dimensional Photonic Structures

Abstract

Weyl semimetals can be described as the three-dimensional analogue of graphene, showing linear dispersion around nodes (Weyl points). Tantalum arsenide is among the most studied Weyl semimetals. It has been demonstrated that TaAs has a very high value of the real part of the complex refractive index in the infrared region. In this work we show one-dimensional photonic crystals alternating TaAs with SiO 2 or TiO 2 and a microcavity where a layer of TaAs is embedded between two SiO 2 -TiO 2 multilayers.

Lasing with Topological Weyl Semimetal

“…if we introduce b := 2π/b ′ . In (28), the lower bound of b ′ can be identified by b ′ c := 2αλ/π(η 2 − sin 2 θ). Thus we realize that the lower bound of b ′ depends on the incidence angle θ and wavelength λ.…”

“…Therefore, once the wavelength is increased, the corresponding b ′ c value is reduced in order to observe a lasing in both plus and minus modes. The following graphs display the justification of our calculations which are based on the following specifications of a nonmagnetic (µ ≈ 1) TaAs TWS slab system [27][28][29][30][31] η ≈ 6, λ = 1400 nm, L = 1 cm, θ = 30 Thickness of TWS slab plays a rather distinctive role in case of lasing. The thicker TWS slab is, the higher quality factor is achieved.…”