Electromagnetic surface waves at exceptional points

Abstract

Guided by the planar interface of two dissimilar linear, homogeneous mediums, a Voigt surface wave arises due to an exceptional point of either of the two matrixes necessary to describe the spatial characteristics in the direction normal to the planar interface. There is no requirement for either or both partnering mediums to be dissipative, unlike a Voigt plane wave which can propagate only in a dissipative medium.

Dyakonov surface waves in dielectric crystals with negative anisotropy

“…A positive optical anisotropy means that ε > ε ⊥ , where ε (or ε ⊥ ) is the principal value of dielectric permittivity tensor parallel to (or perpendicular to) the optical axis. Since then, extensive research has been performed toward the theoretical studies of Dyakonov-like surface waves at interfaces of different combinations of isotropic, uniaxial, biaxial, and chiral materials with positive anisotropy [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. A narrow range of propagation angles and the requirement of positive anisotropy sufficiently decreases the number of materials suitable for practical realization of DSWs.…”