Abstract

A leaky-wave theory is applied to the study of the lateral shift of a bounded optical beam reflected from a prism–air–metal (and prism–metal–air) layered configuration with surface-plasmon excitations. The locations of the pole and the zero of the reflection coefficient for the leaky surface-plasmon mode are calculated as one varies the thickness of the center layer. The excited surface-plasmon mode is leaky because of the presence of the prism. Both the real part and the imaginary part of the pole are affected by the energy leakage. The detailed structure of the reflected intensity and the forward and backward shifts of the reflected beam are illustrated.

© 1986 Optical Society of America

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