共查询到20条相似文献,搜索用时 46 毫秒
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合成了新型偶氮分子偶氮二苯胺ADPA(Azo-diphenylamine),将其掺入聚乙烯咔唑Poly(N-Vinylcarba-zole)(PVK)和聚丙烯丁酯(Poly-butylacrylate)(PBA)的聚合物(PVK-PBA)以及三硝基芴酮2,4,7-trinitro-9-flu-orenone(TNF)聚合制成薄膜器件。结果表明掺杂偶氮苯聚合物薄膜在非共振吸收下具有强的光致取向增强光折变效应。光致折射率变化值Δn达到1.3×10-3以上。样品在两相干光束作用下,可建立光折射率光栅,其衍射效率可超过30%,实现了光全息存储。讨论了影响折射率光栅的因素,并对全息存储相关结果形成的机制进行了分析。 相似文献
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偶氮苯侧链聚合物液晶薄膜的光致双折射和永久光学性存储研究 总被引:1,自引:8,他引:1
研究了一种含偶氮基侧链聚合物液晶薄膜,该液晶薄膜表现出显着的光致双折射(Δn~1.1×10-2).当关闭写光作用后,光致双折射的大小没有任何衰减,表现出永久光存储特性.光致双折射的擦除可通过将样品加热到接近其清亮点温度,或用一束圆偏振光照射来实现.分析了偶氮侧链聚合物永久性光学存储的物理机制. 相似文献
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一种新型偶氮化合物中的高效率实时全息光栅的实验研究 总被引:1,自引:0,他引:1
合成了一种新的含偶氮基的三元共聚物,由于在主链中链接柔性基团,使其具有相对较低的玻璃化温度,在633nm处光感生双折射δn值可达10^-3量级。实验上获得了几个乃至几百微米厚的具有高光学无效性的薄膜,在633nm波长处写一息光栅的实时单光束衍射效率可达10%以上。 相似文献
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用实验方法研究了一种新合成的绿光敏感光致聚合物的高密度全息存储性质.结果表明该种光致聚合物具有较高的衍射效率、大的动态范围和折射率调制度,适合做高密度数字全息存储的记录材料,但材料的灵敏度需要提高,同时读出过程必须考虑曝光过程所导致的布拉格偏移;利用角度复用技术在样品的同一位置记录了20个数字化数据信息页,存储密度达到0.125GBcm3,平均误码率达到5.15×10
关键词:
光致聚合物
高密度数字全息存储
布拉格偏移 相似文献
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可实现存储光栅快速增强的新型全息存储结构 总被引:4,自引:0,他引:4
提出一种新型全息数据存储结构,该结构包含两块存储的内容完全相同的光折变晶体,无需相位共轭器,仅利用两束时域快速调制的平面参光波便可实现对存储全息图的迅速增强。文章讨论了调制速率,读出光强比,晶体非线性耦合强度及初始光栅强度对增强速度及可获得的饱和衍射效率的影响。 相似文献
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偶氮苯聚合物全息光栅衍射效率和偏振特性研究 总被引:1,自引:0,他引:1
研究了不同偏振全息模式下基于交联偶氮苯聚合物薄膜的相位光栅的形成机理、衍射效率和偏振特性.利用琼斯矢量表征了正交线偏振(SP)和半行线偏振(SS)干涉模式下的偏振干涉场.基于SP和SS两种模式,制作了无明显表成起伏的纯折射率光栅和有表面起伏的浮雕光栅.偏光显微镜(POM)观测说明纯折射率光栅具有周期性的折射率分布;近场光学显微镜(SNOM)探测说明纯折射率光栅和浮雕光栅的表而起伏在5 nm以下和 85.23 nm.实验表明.当探测光为水平偏振时,纯折射率光栅的衍射效率达到22.2%.浮雕光栅只能达到1.65%.纯折射率光栅的0、 1级衍射光分别为水平和竖直线偏振光,偏振度达到0.9969和0.9963;浮雕光栅的0, 1级衍射光均为水平线偏振光. 相似文献
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利用偏振全息记录的方法在一种含偶氮侧链的液晶聚合物薄膜中写入了二维偏振光栅.实验采用两束正交偏振的532 nm线偏光作为写入光,在样品同一点上分别记录了相互垂直的两个一维偏振光栅,继而对所构成的二维偏振光栅的特性进行了研究.实验结果表明:二维光栅的衍射效率比一维光栅低,其偏振特性是两个一维光栅元特性的叠加;二维光栅衍射效率对入射光偏振态的依赖性和光栅的偏振转换性质来源于材料中线双折射和圆双折射的共同作用.
关键词:
偏振全息
二维光栅
偶氮液晶聚合物 相似文献
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The nonlinear optical properties of an azobenzene polymer azol2-MO were investigated by a Z-scan technique. The polymer was synthesized by assembling the liquid-crystalline polymer azol2 with methyl orange. The nonlinear refrac- tive index (1.39×10^-15 cm2/W) and the nonlinear absorption coefficient (0.11 cm/GW) of azol2-MO were determined with 532-nm picosecond laser pulses at the irradiance of 92.40 GW/cm2. When compared to the nonlinear properties of azol2 and methyl orange, azol2-MO possesses the advantages of its two constituents and shows larger nonlinear optical properties. 相似文献
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Yeh-Wei Yu 《Optics Communications》2010,283(20):3895-3900
A paraxial equation for calculating pixel-based 2-D shifting selectivity of collinear holographic storage system is proposed. The equation shows that the broader reference pattern makes high shifting selectivity. In addition, both amplitude and phase modulation make no obvious change in shifting selectivity so shifting selectivity is not affected through advanced design of reference pattern. Besides, a simplified formula based on a point signal is proposed, which shows a clear physical insight that the shifting selectivity is the square of Fourier transform of the intensity distribution of reference pattern and does not depend on thickness of the disc when a point signal is applied. 相似文献
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N. A. Davidenko I. I. Davidenko A. N. Popenaka I. A. Savchenko A. N. Shumelyuk 《Journal of Applied Spectroscopy》2007,74(6):926-928
We have studied the possibility of recording holograms in films of the 4-methacroyloxy-(4′-carboxy-3′-hydroxy)-2-chloroazobenzene
polycomplex with cobalt, with parallel and orthogonal orientation of the light beam polarization. We have shown that these
films can be used as recording media for polarization holography. The characteristic features of relaxation of the diffraction
efficiency of the holograms are connected with cistrans isomerization of the azobenzene groups and the characteristic features
of structural rearrangement in the polymer matrix. We hypothesize that the information-related characteristics of the studied
recording media can be controlled by external electric or magnetic fields, due to the presence of magnetic metal ions within
the polymer film.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 6, pp. 830–832, November–December, 2007. 相似文献
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Orientation-enhanced nonlinear optical properties and phase-conjugate reflective system of a novel Azobenzene doped polymer film 下载免费PDF全文
This paper reports that the nonlinear refractive index of
a novel organic optical storage film doped azo-diphenylamine polymer is
measured by using the $Z$-scan technique. The nonlinear refractive index up to
$3.7\times 10 ^{ - 6 }$~cm$^{2}$/W induced by thermo-optical effect is
obtained. It indicates that the sample has excellent optical nonlinear
properties. The physical mechanism of the great nonlinear optical effect is
analysed and the optical conjugate characteristic is also discussed with
degenerate four-wave-mixing. The phase conjugate wave diffracted from the
formative refractive index grating in the sample is acquired and its
equivalent reflectivity reaches about 22{\%}. On this basis, the reflective
wave phase-conjugated mirror system was designed, and the image aberration
experienced in propagation in the storage experiment is corrected by using
the system. 相似文献