Fig. 2: Directional propagation of LPs.
From: Observation of directional leaky polaritons at anisotropic crystal interfaces
a–c Electric field amplitudes of polaritons in real space showing directional propagation at frequency: a \(\omega=1470\,{{{{{{\rm{cm}}}}}}}^{-1}\), corresponding to g-HPs in the type-II hyperbolic regime; b \(\omega=887\,{{{{{{\rm{cm}}}}}}}^{-1}\), corresponding to LPs in type-I hyperbolic regime; c \(\omega=890\,{{{{{{\rm{cm}}}}}}}^{-1}\), corresponding to LPs in the transparent regime. In all cases \(\theta={23.3}^{^\circ }\). d–f Corresponding in-plane dispersion (red curves) overlaid with Fourier spectra of the \({{{{{{\rm{E}}}}}}}_{z}\) fields from numerical simulations and normalized Poynting vectors (white arrows) of: d g-HPs at frequency \(\omega=1470\,{{{{{{\rm{cm}}}}}}}^{-1}\) calculated above the interface (in the air); e LPs at frequency \(\omega=887\,{{{{{{\rm{cm}}}}}}}^{-1}\); f. LPs at frequency \(\omega=890\,{{{{{{\rm{cm}}}}}}}^{-1}\). All d–f are calculated from Eq. (1). All lines in d–f correspond to the same quantities as lines in Fig. 1.
