Abstract
Optical response of metal-dielectric inhomogeneous films is considered. The generalized Ohm's law is formulated that relates electric and magnetic fields outside to the currents inside the film. Computer simulations, with the use of the generalized Ohm's law show that the local electric and magnetic fields experience giant spatial fluctuations. The fields are localized in small spatially separated peaks: electric and magnetic hot spots. In these hot spots the local fields (both electric and magnetic) exceed the applied field by several orders of magnitude. It is also shown that transmittance of a regular modulated metal film is strongly enhanced when the incident wave is in resonance with surface polaritons in the film. A new optical switch based on this effect is proposed.
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