Induced Optical Bistability in a Composite of Ellipsoidal Metal/Dielectric Nanoparticles of Dielectric Core

In this paper, we studied the enhancement factor of local field for ellipsoidal metal composite, and optical induced bistability of metal/dielectric composites with in linear host matrixes. Using the calculated enhancement factor of local field and the cubic equation of the optical induced bistability of the composite material, the parameters of the bistability domain are calculated. The analytical and numerical results show that the enhancement factor of local field is extremely enhanced and the optical induced bistability increases its domain. 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. At high metal fraction, the two bistability domains merge and form one entire bistability domain.