Self-excitation of surface plasmon polaritons

Article

关键词: CAVITY QUANTUM ELECTRODYNAMICS;    STIMULATED-EMISSION;    METAMATERIALS;    PROPAGATION;    MODE;   

DOI  :  10.1103/PhysRevB.93.155421

来源: SCIE

【 摘 要 】

The novel effect of self-excitation of surface plasmons (SESP) in a plasmonic nanocavity is predicted, and its theory is developed from first principles. It is assumed that the cavity is formed by a nanogap between two metals and contains polarizable inclusions. Basing on the dyadic Green's function of the structure, the equations for the field in the cavity are investigated. It is shown that under certain conditions the field becomes unstable that leads to its self-excitation. The threshold criterion for self-excitation as well as the frequency of self-oscillation are derived in an analytical form. The SESP effect is explained in terms of a positive feedback for the polarization of inclusions provided by the field reflected from the cavity walls. These findings suggest a principally new avenue to surface plasmon generation which does not employ stimulated emission and is different from SPASER or plasmon laser.

【 授权许可】

Free