Optical bistability of metal-coated semiconductor nanocrystals

摘要: We study intrinsic optical bistability in nonlinear composites of coated spheres, motivated by a recent experiment on small-particle heterogeneous systems. A self-consistent theory is applied to calculate the local fields spheres with dielectric core and metallic shell, embedded linear host. To resonance response, we use spectral representation find that field generally consists two resonant terms, each which has form similar case spherical inclusions but pole whose location residue depend strongly constant material as well thickness shell. Thus tuning relevant microstructure parameters, it may be possible reduce threshold enhance bistable response. Model calculations various physical quantities are performed accord experimental conditions.