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双光子吸收三维数字光存储
THREE-DIMENSIONAL DIGITAL OPTICAL DATA STORAGE BY TWO-PHOTON ABSORPTION
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摘要: 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1012Bits/cm\+3.文章介绍了双光子吸收三维数字光存储的原理和进展.Abstract: 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 1012Bits/cm\+3.
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