We discover a new kind of surface wave on biaxial hyperbolic metamaterial
which
in the k-space
connects the two diabolical points (or conical singularities) of the equifrequency surface. Interestingly
the propagation of such surface wave is found to be sensitive to the refractive index of the surrounding dielectric medium
showing a convex
concave or flat phase front when the refractive index is varied. Furthermore
the surface wave shows an elliptically polarized state
in which helicity is dependent on the propagation direction. This feature can be utilized for the spin-controllable excitation of surface waves
opening a gateway towards integrated photonic circuits with reconfigurable functionalities.
关键词
Keywords
metamaterialspin orbital couplingsurface wave
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