title: Enhanced ultrafast optical nonlinearity of porous anodized aluminum oxide nanostructures.
abstract: Enhanced ultrafast optical nonlinearities of porous anodized aluminum oxide (AAO) nanostructures, well-known templates for quantum dots fabrication, have been investigated using the differential optical Kerr gate technique at 800 nm. The optical nonlinearity is strongly influenced by the pore number density, the pore size and the shape. Large values of the third-order nonlinear optical susceptibility (chi((3))) of the order of 10(-10)esu are measured. The nonlinear response time is faster than or comparable to the laser pulse width (90 fs) used. The origin and variation of such remarkable optical nonlinearities has been discussed by considering the nanoporous AAO as an effective medium and utilizing the extended Maxwell Garnet theory, and by considering the additional influence from pore diameter, pore shape and surface states.
authors.affiliation: Division of Energy Systems Research, Ajou University, 443-749 Suwon, Republic of Korea.
authors.forename: Hwang Woon
authors.initials: HW
authors.lastname: Lee
authors.forename: John Kiran
authors.initials: JK
authors.lastname: Anthony
authors.forename: Hoang-Duy
authors.initials: HD
authors.lastname: Nguyen
authors.forename: Sun-Il
authors.initials: SI
authors.lastname: Mho
authors.forename: Kihong
authors.initials: K
authors.lastname: Kim
authors.forename: Hanjo
authors.initials: H
authors.lastname: Lim
authors.forename: Jaejin
authors.initials: J
authors.lastname: Lee
authors.forename: Fabian
authors.initials: F
authors.lastname: Rotermund