Two-dimensional optical effects were observed for surface electromagnetic waves (SEW) on metals at λ = 3.55 cm. Refractive processes with prisms and lenses established Snell's law experimentally. Reflection with prisms and metal sheets established the law of reflection and indicated that radiative losses were small and that Fresnel's equations hold to a good approximation for the reflectivities of SEW. A two-dimensional SEW grating was made and first-order diffraction observed. Although the experiments were performed at microwave frequencies, the principles are usable for two-dimensional SEW optics at least as far as the near ir. It was shown that the propagation constant of the SEW with an overlayer material is as though the SEW propagates entirely in the overlayer material. That is, losses in the metal substrate were negligible.
© 1975 Optical Society of America
Original Manuscript: October 24, 1974
Published: June 1, 1975
R. J. Bell, C. A. Goben, M. Davarpanah, K. Bhasin, D. L. Begley, and A. C. Bauer, "Two-dimensional optics with surface electromagnetic waves," Appl. Opt. 14, 1322-1325 (1975)