Abstract

The recent years have seen a rapid expansion of research of the excitation of electromagnetic surface shape
resonances in lamellar metallic gratings by light in the visible to near-infrared range based on the model of
surface plasmon–polaritons. We argue that these electromagnetic waves propagate along metal–dielectric
interfaces and can be guided by metallic nanostructures beyond the new fundamental Bose-particles with spin
one and rest mass e m ? 2.5?10?5m (where e m is the mass of the electron). We call these light bosons because
they induce the electromagnetic field. The existence of light bosons is confirmed by experiment connected with
original type of the Bose-Einstein condensation. In this letter, we treat the interaction between light boson modes
and electron modes in a metallic medium which leads to existence of the polaritons. These polaritons acquire a
property of the charged electron gas with the Coulomb interaction and are excited into a fixed interval of wave
numbers.

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