Analytical description of enhancement factor in induced optical bistability for ellipsoidal metal/dielectric composite core

In this paper the enhancement factor of local field for pure ellipsoid metal/dielectric composite in linear host matrices is studied. The enhancement factor of local field which extremely enhanced is shown by analytical and numerical results. It is shown that the local field in metal ellipsoidal particles with dielectric core in an external varying electric field has two maxima at two different frequencies. The second maximum becomes more important with increment in the metal fraction.