双光子吸收三维数字光存储

THREE-DIMENSIONAL DIGITAL OPTICAL DATA STORAGE BY TWO-PHOTON ABSORPTION

双光子吸收三维数字光存储是实现超高密度光存储的一种重要方法 .双光子吸收几率与作用光强的平方成正比 ,使得只有位于焦点小范围内的记录介质受到激发 .双光子吸收激发的光致聚合作用、光致变色作用、光致荧光漂白、光折变等效应 ,引起这一小范围内记录介质的光学性质发生改变 .结果能将信息写到亚微米尺度的体积单元中 ,实现三维数字光存储 .这种双光子吸收三维数字光存储的存储密度可达 10 12 Bits/cm3 .文章介绍了双光子吸收三维数字光存储的原理和进展 .

An important way to realize super\|high density optical storage is by three\|dimensional digital optical storage based on two\|photon absorption.The rate of two\|photon excitation is proportional to the squared intensity of the incident light.This produces excitation only within a small region of the focus spot of the recording medium. The effects of two\|photon excitation,such as photopolymerization,photochromic,photobleaching and photorefractive effects,change the optical properties of the excited fraction of the recording medium.As a result,information can be written as submicrometer volume elements,and three\|dimensional digital optical data storage is achieved,the bit density of which may be as large as 10 12 Bits/cm\+3.