Optical Nonlinearities ofPlasmons inSingle GoldNanorods

We measure third-order optical nonlinearities ofplasmons insingle chemically- synthesized goldnanorods using anovelinterferometric scattering technique. We observe ultrafast, coherent material nonlinearities that areenhanced bylocalization oflight intherods. ©2005 Optical Society.of America OCIScodes: (190.3970) Microparticle nonlinear optics; (240.6680) Surface plasmons