Enhanced ultrafast optical nonlinearity of porous anodized aluminum oxide nanostructures.
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.
Lee
Hwang Woon
HW
Division of Energy Systems Research, Ajou University, 443-749 Suwon, Republic of Korea.
Anthony
John Kiran
JK
Nguyen
Hoang-Duy
HD
Mho
Sun-Il
SI
Kim
Kihong
K
Lim
Hanjo
H
Lee
Jaejin
J
Rotermund
Fabian
F