title: All-optical switching mediated by magnetic nanoparticles.
abstract: We demonstrate the switching of light in the near-infrared region (1.55 microm) through the manipulation of magnetic nanoparticles in a magnetic fluid by using another light in the visible region (0.532 microm). The formation of a photonic gap is found in the magnetic fluid when a laser light or a magnetic field is applied. A shift of the photonic gap to longer wavelengths is observed with increasing laser power or magnetic field strength.
authors.affiliation: Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering,South China Normal University, Guangzhou 510006, China.
authors.forename: Qiao-Feng
authors.initials: QF
authors.lastname: Dai
authors.forename: Hai-Dong
authors.initials: HD
authors.lastname: Deng
authors.forename: Wei-Ren
authors.initials: WR
authors.lastname: Zhao
authors.forename: Jin
authors.initials: J
authors.lastname: Liu
authors.forename: Li-Jun
authors.initials: LJ
authors.lastname: Wu
authors.forename: Sheng
authors.initials: S
authors.lastname: Lan
authors.forename: Achanta Venu
authors.initials: AV
authors.lastname: Gopal