双光子三维光存储关键技术及其实验系统研究
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摘要
随着信息技术的飞速发展，人们对信息存储容量的需求越来越大。三维光信息存储作为一种提高信息存储容量的手段越来越受到人们的广泛关注。
本课题在国家自然科学基金(No．50275140，No．50335050)资助下完成。为了实现高密度三维光信息存储，并与现有CD／DVD系统相兼容，本博士论文基于现有CD／DVD成熟的聚焦、循道伺服技术，采用双光子激发信息写入，单光子共焦显微镜读出或双光子读出方法，搭建了一套与CD／DVD系统相兼容的双光子三维光盘存储实验系统，并进行双光子三维光存储相关关键技术研究。由于双光子吸收的非线性，采用双光子写入和读出的方法可以有效地解决层与层之间的相互干扰问题，从而提高多层之间的抗干扰能力。共焦读出方式具有很强的三维分辨能力，同时也可以避免层间信息的干扰，得到更高的信噪比。本博士论文主要研究成果包括以下几个方面：
第一，基于双光子吸收技术和CD／DVD伺服技术，自行搭建了一套双光头三维光盘存储实验系统，包括：声光开关(声光调制器)控制，CD／DVD伺服系统的应用，荧光共焦读写系统，音圈电机控制系统，聚焦和循道误差信号的提取与传输，加法器电路的实现，与荧光信号检测系统等。并对双光头同步误差进行了测试，结果表明在一定条件下双光头同步误差基本符合双光头三维光存储系统正常运行需满足双光头同步误差小于2μm的要求。
第二，由于三维光信息存储点在介质的内部，因此在读写过程中激光需要经过两层不同折射率的介质(空气和存储介质)，可能会对像差和存储效果产生很大的影响。为此建立了光学存储系统模型，在平行平板条件下，利用波像差函数推导展开，获得五项初级(赛德耳)像差，即球差、慧差、像散、场曲、畸变，从理论和实验上分析系统各项光学参数对折射率失配引起的像差的影响。采用泽尔尼克多项式对折射率失配引起的像差进行补偿理论研究，并对补偿方法进行了相应地分析。
第三，对一种新的光致漂白材料二苯乙烯衍生物进行吸收光谱和荧光光谱特性分析，并且在三维光存储实验系统上，进行了二进制编码信息的双光子存储和读出实验研究，实现了三层光信息存储，信息点间距和信息层间距分别为4μm和15μm，用Matlab软件读出信息的信号强度并对其进行了识别，识别结果与写入的二进制编码信息完全一致。对一种新的微爆材料(以PMMA为基质掺杂Ce(DBM)_3Phen染料)进行了详细的存储性能分析和实验研究，实现了四层信息存储，点间距和层间距分别是4μm和16μm。
第四，总结了本文的研究内容和主要创新点，并展望三维光存储未来的发展方向。
上述研究工作为今后三维信息存储向实用化方向发展打下了基础。
Along with development of information technology at very fast speed, there is a increasing demand for the capacity of information data storage. Three-dimension optical data storage catches people's attention more and more as a way of improving capacity of information data storage.
This project is supported by National Natural Science Fund of China (No.50275140, No.50335050). To achieve higher data storage capacity and be compatible with CD/DVD's system, this thesis buildes a two-photon three-dimensional optical data storage system which is compatible with CD/DVD system, and carries through research on key technology of two-photon three-dimension data storage, based on current mature servo technology of focusing and tracking and adopting writing of two-photon absorption and readout of one-photon confocal or two-photon. Because of nonlinearity of two-photon absorbance, it's an effective way to solve disturbance between layer and layer by using two-photon writing and readout, accordingly to improve the ability of anti-jamming layer by layer. The means of the confocal readout posses of three-dimensional resolving power more strong, synchronously avoids the information's disturbance between layer and layer, and gains higher signal-to-noise ratio. The chief content of this thesis research includes several aspects as follows:
First, based on technologies of two-photon absorption and CD/DVD servo, build a two-photon three-dimension optical data storage system, which includes:the control acousto-optical modulation device, the application of servo system of CD/DVD, the system of fluorescence confocal read-in and readout, the control system of voice-coil motor, abstraction and transfer of focusing and tracking error signal, the realization of the summator circuit, the system of the detection of fluorescence signal et al.. And proceed the check of two pick-up head's synchro error, experiments approve that in a given condition two pick-up head's synchro error basically accords with desire that two pick-up head's synchro error is less than 2μm for two pick-up head three-dimension optical data storage system working well.
Secondly, the three-dimension optical storage spots are in the storage material, so the beam of light passes through two different media (such as air and storage material) in writing three-dimensional information, influences optical aberration and storage effect. So set up the model of the optical storage system, in the condition of parallel flat, deduces via wave aberration function, gets five primary Seidel aberration: spherical aberration, coma, astigmatism, field curvature, and distortion, and simulates and analyses on the primary aberration in two case of level and tilted storage material; analyse each optical parameter of system effect on optical aberration and storage impression of refractive index mismatch in the theory and experiment. Carry through the theory research on compensation of aberration induced by refractive index mismatch by using Zernike polynomials, and analyse compensation method.
Thirdly, analyse the absorption spectrum and fluorescence spectrum of a novel photobleaching material consisting of stilbene derivant, and on the three-dimension optical data storage system, carry out two-photon write-in and readout experimental study of binary format code, realize three layers optical data storage, the two adjacent bits distance in each layer is 4μm and the two adjacent layers interval is 15μm, The signal intensity of the written information was readout and identified with Matlab software, and the identified result matches with the written binary format code. And carry through research on the storage performance of a novel microexplosion material consisting of a PMMA block doped with Ce(DBM)3Phen in detail, realize four layers optical data storage,the two adjacent bits distance in each layer was 4μm and the two adjacent layers interval was 16μm.
Fourthly, generalize the research content and chief innovation of this thesis, and expect the future direction of three-dimension optical data storage.
The above-mentioned work provides the foundation for the industrialization of three-dimension information storage in the future.
本课题在国家自然科学基金(No．50275140，No．50335050)资助下完成。为了实现高密度三维光信息存储，并与现有CD／DVD系统相兼容，本博士论文基于现有CD／DVD成熟的聚焦、循道伺服技术，采用双光子激发信息写入，单光子共焦显微镜读出或双光子读出方法，搭建了一套与CD／DVD系统相兼容的双光子三维光盘存储实验系统，并进行双光子三维光存储相关关键技术研究。由于双光子吸收的非线性，采用双光子写入和读出的方法可以有效地解决层与层之间的相互干扰问题，从而提高多层之间的抗干扰能力。共焦读出方式具有很强的三维分辨能力，同时也可以避免层间信息的干扰，得到更高的信噪比。本博士论文主要研究成果包括以下几个方面：
第一，基于双光子吸收技术和CD／DVD伺服技术，自行搭建了一套双光头三维光盘存储实验系统，包括：声光开关(声光调制器)控制，CD／DVD伺服系统的应用，荧光共焦读写系统，音圈电机控制系统，聚焦和循道误差信号的提取与传输，加法器电路的实现，与荧光信号检测系统等。并对双光头同步误差进行了测试，结果表明在一定条件下双光头同步误差基本符合双光头三维光存储系统正常运行需满足双光头同步误差小于2μm的要求。
第二，由于三维光信息存储点在介质的内部，因此在读写过程中激光需要经过两层不同折射率的介质(空气和存储介质)，可能会对像差和存储效果产生很大的影响。为此建立了光学存储系统模型，在平行平板条件下，利用波像差函数推导展开，获得五项初级(赛德耳)像差，即球差、慧差、像散、场曲、畸变，从理论和实验上分析系统各项光学参数对折射率失配引起的像差的影响。采用泽尔尼克多项式对折射率失配引起的像差进行补偿理论研究，并对补偿方法进行了相应地分析。
第三，对一种新的光致漂白材料二苯乙烯衍生物进行吸收光谱和荧光光谱特性分析，并且在三维光存储实验系统上，进行了二进制编码信息的双光子存储和读出实验研究，实现了三层光信息存储，信息点间距和信息层间距分别为4μm和15μm，用Matlab软件读出信息的信号强度并对其进行了识别，识别结果与写入的二进制编码信息完全一致。对一种新的微爆材料(以PMMA为基质掺杂Ce(DBM)_3Phen染料)进行了详细的存储性能分析和实验研究，实现了四层信息存储，点间距和层间距分别是4μm和16μm。
第四，总结了本文的研究内容和主要创新点，并展望三维光存储未来的发展方向。
上述研究工作为今后三维信息存储向实用化方向发展打下了基础。
Along with development of information technology at very fast speed, there is a increasing demand for the capacity of information data storage. Three-dimension optical data storage catches people's attention more and more as a way of improving capacity of information data storage.
This project is supported by National Natural Science Fund of China (No.50275140, No.50335050). To achieve higher data storage capacity and be compatible with CD/DVD's system, this thesis buildes a two-photon three-dimensional optical data storage system which is compatible with CD/DVD system, and carries through research on key technology of two-photon three-dimension data storage, based on current mature servo technology of focusing and tracking and adopting writing of two-photon absorption and readout of one-photon confocal or two-photon. Because of nonlinearity of two-photon absorbance, it's an effective way to solve disturbance between layer and layer by using two-photon writing and readout, accordingly to improve the ability of anti-jamming layer by layer. The means of the confocal readout posses of three-dimensional resolving power more strong, synchronously avoids the information's disturbance between layer and layer, and gains higher signal-to-noise ratio. The chief content of this thesis research includes several aspects as follows:
First, based on technologies of two-photon absorption and CD/DVD servo, build a two-photon three-dimension optical data storage system, which includes:the control acousto-optical modulation device, the application of servo system of CD/DVD, the system of fluorescence confocal read-in and readout, the control system of voice-coil motor, abstraction and transfer of focusing and tracking error signal, the realization of the summator circuit, the system of the detection of fluorescence signal et al.. And proceed the check of two pick-up head's synchro error, experiments approve that in a given condition two pick-up head's synchro error basically accords with desire that two pick-up head's synchro error is less than 2μm for two pick-up head three-dimension optical data storage system working well.
Secondly, the three-dimension optical storage spots are in the storage material, so the beam of light passes through two different media (such as air and storage material) in writing three-dimensional information, influences optical aberration and storage effect. So set up the model of the optical storage system, in the condition of parallel flat, deduces via wave aberration function, gets five primary Seidel aberration: spherical aberration, coma, astigmatism, field curvature, and distortion, and simulates and analyses on the primary aberration in two case of level and tilted storage material; analyse each optical parameter of system effect on optical aberration and storage impression of refractive index mismatch in the theory and experiment. Carry through the theory research on compensation of aberration induced by refractive index mismatch by using Zernike polynomials, and analyse compensation method.
Thirdly, analyse the absorption spectrum and fluorescence spectrum of a novel photobleaching material consisting of stilbene derivant, and on the three-dimension optical data storage system, carry out two-photon write-in and readout experimental study of binary format code, realize three layers optical data storage, the two adjacent bits distance in each layer is 4μm and the two adjacent layers interval is 15μm, The signal intensity of the written information was readout and identified with Matlab software, and the identified result matches with the written binary format code. And carry through research on the storage performance of a novel microexplosion material consisting of a PMMA block doped with Ce(DBM)3Phen in detail, realize four layers optical data storage,the two adjacent bits distance in each layer was 4μm and the two adjacent layers interval was 16μm.
Fourthly, generalize the research content and chief innovation of this thesis, and expect the future direction of three-dimension optical data storage.
The above-mentioned work provides the foundation for the industrialization of three-dimension information storage in the future.
引文
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