【摘要】：現(xiàn)代科技對數(shù)據(jù)容量需求的急速增長使超高密度信息存儲技術(shù)成為當(dāng)代信息技術(shù)領(lǐng)域重要的研究課題。多維信息存儲改變了原有光存儲技術(shù)依靠縮短激光波長和增加物鏡數(shù)值孔徑來提高存儲密度的傳統(tǒng)思路,在幾何三維空間之外，，選擇其他可以影響數(shù)據(jù)寫入和讀取的物理特性參量建立獨立的坐標(biāo)系,可以將多重信息記錄到存儲介質(zhì)的同一物理空間上,并實現(xiàn)獨立的讀取,從而增加信息存儲的維度。多維信息存儲技術(shù)可實現(xiàn)的存儲容量大,控制靈活方便,已成為下一代光存儲技術(shù)發(fā)展的重要方向之一。本文結(jié)合飛秒激光雙光子吸收的三維高分辨優(yōu)勢和偶氮苯材料的光致異構(gòu)取向重分布特性,發(fā)展了偏振多元多階信息存儲技術(shù),并對其中的關(guān)鍵間題進行了理論和實驗研究。 首先,介紹了偶氮苯的雙光子光響應(yīng)性質(zhì)及機理,包括雙光子光致異構(gòu)、光致取向和光致取向燒孔等；對雙光子光致異構(gòu)速率方程和光致取向速率方程分別進行了描述；對于其中最重要的光致各向異性性質(zhì)——光致雙折射進行了理論分析和實驗測量；對研究非線性光學(xué)特性的Z掃描方法進行了介紹,并對實驗結(jié)果進行了分析。 其次,搭建了飛秒激光雙光子偏振存儲系統(tǒng)并實現(xiàn)了偏振多元信息存儲；分別利用偏振透射光讀出,偏光讀出和反射式掃描共焦讀出三種方式驗證了利用飛秒激光實現(xiàn)可擦除的偏振多元存儲的可行性：存儲密度理論值可以達到250Gb/cm3;還對存儲過程中曝光劑量對信息點強度和大小的影響進行了實驗研究和理論分析,為寫入?yún)?shù)的進一步優(yōu)化提供依據(jù)。 另外,雙偶氮苯poly(M2BAN-co-MMA)聚合物的偏振存儲過程中,當(dāng)曝光量超過特定閾值時,會出現(xiàn)灰階低于背景的暗點。本文利用這一性質(zhì)實現(xiàn)了偏振多階信息存儲：同時通過對與入光曝光時間的控制實現(xiàn)了9階信息存儲,并討論了多階信息存儲中的影響因素；對偏振飛秒激光在雙偶氮苯聚合物薄膜中誘導(dǎo)產(chǎn)生表面形貌進行了深入的理論模型研究和實驗分析,結(jié)果表明電場梯度力模型可以很好的解釋偏振激光引起的表面形貌；并且對不同曝光條件下的偏振存儲進行了詳細的討論。 最后,論文進行了基于空間光調(diào)制器的三維并行存儲技術(shù)的初步研究；詳細介紹了空間光調(diào)制器的結(jié)構(gòu)以及調(diào)制機理；設(shè)計了三維計算全息算法并在此基礎(chǔ)上實現(xiàn)了多層圖像的設(shè)計和重現(xiàn),驗證了三維動態(tài)并行數(shù)據(jù)存儲的可行性；同時考慮了折射率失配引起的離焦和球差對三維動態(tài)并行存儲的影響并提出在全息算法迭代過程中進行補償,為下一步實現(xiàn)并行多維信息存儲和高效高分辨跨尺度全息并行加工奠定了基礎(chǔ)。
[Abstract]:With the rapid growth of the demand for data capacity in modern science and technology, ultra-high density information storage technology has become an important research topic in the field of information technology. Multi-dimensional information storage has changed the traditional idea that the original optical storage technology can improve the storage density by shortening the laser wavelength and increasing the numerical aperture of the objective lens. The independent coordinate system can be established by selecting other physical characteristic parameters which can affect the data writing and reading. The multiple information can be recorded into the same physical space of the storage medium and read independently, thus increasing the dimension of information storage. Multi-dimensional information storage technology can achieve large storage capacity, flexible and convenient control, which has become one of the important directions of the next generation optical storage technology. In this paper, based on the three-dimensional high resolution advantage of femtosecond laser two-photon absorption and the redistribution of photoinduced isomerization of azobenzene, the multi-order information storage technology of polarization is developed, and the key problems are studied theoretically and experimentally. Firstly, the two-photon photoresponse properties and mechanism of azobenzene are introduced, including two-photon photoisomerization, photo-orientation and photo-orientation hole burning, and the two-photon photoisomerization rate equation and photo-orientation rate equation are described respectively. The most important photoinduced anisotropy, photoinduced birefringence, is analyzed theoretically and experimentally, and the Z-scan method for studying nonlinear optical properties is introduced, and the experimental results are analyzed. Secondly, a femtosecond laser two-photon polarization storage system is built and the polarization multi-component information storage is realized. The feasibility of erasable polarization multivariate storage using femtosecond laser is verified by three ways of polarized readout and reflection scanning confocal readout: the theoretical value of storage density can reach 250 GB / cm ~ 3, and the information of exposure dose during storage is also given. Experimental study and theoretical analysis of the effects of point strength and size are carried out. It provides the basis for further optimization of write parameters. In addition, in the polarization storage process of poly (M2BAN-co-MMA) polymer, when the exposure exceeds a certain threshold, a dark spot with gray scale below the background will appear. In this paper, the polarization multi-order information storage is realized by using this property. At the same time, the ninth order information storage is realized by controlling the exposure time with the incoming light, and the influencing factors in the multi-order information storage are discussed. The surface morphology induced by polarization femtosecond laser in the diazobenzene polymer film was studied and experimentally analyzed. The results show that the electric field gradient force model can explain the surface morphology induced by polarized laser. Polarization storage under different exposure conditions is discussed in detail. Finally, the paper makes a preliminary study of 3D parallel storage technology based on spatial light modulator, and introduces the structure and modulation mechanism of spatial light modulator in detail. The 3D CGH algorithm is designed and the multi-layer image is designed and reproduced on the basis of which the feasibility of 3D dynamic parallel data storage is verified. At the same time, the influence of defocus and spherical aberration caused by refractive index mismatch on 3D dynamic parallel storage is considered, and compensation is proposed in the iterative process of holographic algorithm. It lays a foundation for the next step to realize parallel multidimensional information storage and efficient high resolution cross scale holographic parallel processing.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2012
【分類號】：TP333

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