FIG 1 (IMAGE)
Caption
Figure 1. The forbidden propagation of hyperbolic phonon polaritons. (a) Dispersion and corresponding Im(rp) of PhPs in a 100-nm-thick α-MoO3 slab for air (a) and (c), SiC (b), and Au (d) substrates at different frequencies. At an incident frequency of 936 cm−1, the principal axis of the hyperbola-like curves lays along the [100] direction (a) while it is along [001] direction (b) when adopting SiC substrate. The blue and yellow curves present l = 0 and l = 1 modes, respectively. (e–h) The simulated near-field distribution, Re (Ez), is excited by an electric dipole on the α-MoO3 slab. The insets are the corresponding dispersions obtained by the Fourier transform of the electric distribution Re (Ez)
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