Evanescent Electromagnetic Waves Research Articles

Elastic scattering of evanescent electromagnetic waves

Analytic and numerical results are given for the elastic scattering of evanescent electromagnetic waves by dielectric spheres. Some polarization and symmetry effects not found in Lorenz-Mie scattering are noted. The possibility of experimental studies is also discussed.

Phase-Shift Measurement of Evanescent Electromagnetic Waves*

Phase shifts suffered by evanescent electromagnetic waves traversing an air gap between two glass prisms have been measured. Because the evanescent waves propagate parallel to the glass-to-air interface, they should be able to penetrate in a direction normal to the interface, without change of phase, although the amplitude is expected to decrease with depth of penetration. This has been confirmed by the experiment, which showed that the phase shifts are substantially independent of the width of the air gap.

Optical excitation of surface plasmons

Described are the resonance effects associated with surface plasmon excitation (the excitation of evanescent electro-magnetic surface waves) which occur when light is reflected from metal gratings and rough surfaces.