title: Guiding and nonlinear coupling of light in plasmonic nanosuspensions.
abstract: We demonstrate two different types of coupled beam propagation dynamics in colloidal gold nanosuspensions. In the first case, an infrared (IR) probe beam (1064 nm) is guided by a low-power visible beam (532 nm) in a gold nanosphere or in nanorod suspensions due to the formation of a plasmonic resonant soliton. Although the IR beam does not experience nonlinear self-action effects, even at high power levels, needle-like deep penetration of both beams through otherwise highly dissipative suspensions is realized. In the second case, a master/slave-type nonlinear coupling is observed in gold nanoshell suspensions, in which the nanoparticles have opposite polarizabilities at the visible and IR wavelengths. In this latter regime, both beams experience a self-focusing nonlinearity that can be fine-tuned.
authors: Trevor S
authors: TS
authors: Kelly
authors: Yu-Xuan
authors: YX
authors: Ren
authors: Akbar
authors: A
authors: Samadi
authors: Anna
authors: A
authors: Bezryadina
authors: Demetrios
authors: D
authors: Christodoulides
authors: Zhigang
authors: Z
authors: Chen