Enhancement of third-order nonlinear optical susceptibilities in silica-capped Au nanoparticle films with very high concentrations

Hamanaka, Y.; Fukuta, K.; Nakamura, A.; Liz-Marzán, L. M.; Mulvaney, P.
June 2004
Applied Physics Letters;6/14/2004, Vol. 84 Issue 24, p4938
Academic Journal
Third-order nonlinear optical susceptibilities (χ(3)) and response times have been investigated for silica-capped Au nanoparticles for various volume fractions, p, of Au nanoparticles ranging from 0.027 to 0.66. The imaginary part of χ(3)(Im χ(3)) around the surface plasmon resonance increases with increasing p up to 0.34, and decreases for p>0.39. In addition to the local field enhancement around the surface plasmon resonance in the composite system, an additional enhancement of Im χ(3) due to the interaction between nanoparticles for p<0.39 is observed. © 2004 American Institute of Physics.


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