title: Nano-optical information storage induced by the nonlinear saturable absorption effect.
abstract: Nano-optical information storage is very important in meeting information technology requirements. However, obtaining nanometric optical information recording marks by the traditional optical method is difficult due to diffraction limit restrictions. In the current work, the nonlinear saturable absorption effect is used to generate a subwavelength optical spot and to induce nano-optical information recording and readout. Experimental results indicate that information marks below 100 nm are successfully recorded and read out by a high-density digital versatile disk dynamic testing system with a laser wavelength of 405 nm and a numerical aperture of 0.65. The minimum marks of 60 nm are realized, which is only about 1/12 of the diffraction-limited theoretical focusing spot. This physical scheme is very useful in promoting the development of optical information storage in the nanoscale field.
authors.affiliation: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China. weijingsong@siom.ac.cn
authors.forename: Jingsong
authors.initials: J
authors.lastname: Wei
authors.forename: Shuang
authors.initials: S
authors.lastname: Liu
authors.forename: Yongyou
authors.initials: Y
authors.lastname: Geng
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.forename: Xiaoyi
authors.initials: X
authors.lastname: Li
authors.forename: Yiqun
authors.initials: Y
authors.lastname: Wu
authors.forename: Aihuan
authors.initials: A
authors.lastname: Dun