title: Nonlinear optical processes in optically trapped InP nanowires.
abstract: We report on the observation of nonlinear optical excitation and related photoluminescence from single InP semiconductor nanowires held in suspension using a gradient force optical tweezers. Photoexcitation of free carriers is achieved through absorption of infrared (1.17 eV) photons from the trapping source via a combination of two- and three-photon processes. This was confirmed by power-dependent photoluminescence measurements. Marked differences in spectral features are noted between nonlinear optical excitation and direct excitation and are related to band-filling effects. Direct observation of second harmonic generation in trapped InP nanowires confirms the presence of nonlinear optical processes.
authors.affiliation: School of Physics, The University of New South Wales , Sydney, NSW 2052, Australia.
authors.forename: Fan
authors.initials: F
authors.lastname: Wang
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Reece
authors.forename: Suriati
authors.initials: S
authors.lastname: Paiman
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gao
authors.forename: Hark Hoe
authors.initials: HH
authors.lastname: Tan
authors.forename: Chennupati
authors.initials: C
authors.lastname: Jagadish