A study is made of the influence of toroidal excitations on the spectrum of surface polaritons of an insulator at its boundary with an ideal metal in a static electric field perpendicular to the contact surface. It is shown that the toroidal polariton mode can be radiative and have normal or anomalous dispersion. A distinguishing feature of the toroidal polariton mode in comparison with an electric-dipole mode is that it crosses the light line, i.e., it can be resonantly excited by an electromagnetic wave propagating along the contact surface. This feature means that it is possible to identify a toroidal polariton mode in the spectrum by varying the angle of incidence of the electromagnetic wave.
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© 2001 American Institute of Physics.
2001
American Institute of Physics
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