A spatially localized photochemical reaction induced by near-field femtosecond laser pulses is demonstrated on a nanometer scale and used for high-density optical data storage. Recorded domains down to 120 and 70 nm are obtained with one-photon and two-photon excitation, respectively. It is shown that the local-field confinement that is due to the quadratic dependence of two-photon excitation on light intensity has the potential to increase the near-field optical storage density.
© 2001 Optical Society of America
Yuzhen Shen, Jacek Swiatkiewicz, Daniel Jakubczyk, Faming Xu, Paras N. Prasad, Richard A. Vaia, and Bruce A. Reinhardt, "High-Density Optical Data Storage With One-Photon and Two-Photon Near-Field Fluorescence Microscopy," Appl. Opt. 40, 938-940 (2001)