菌紫质高密度偏振全息光数据存储实验研究

Experimental study on polarization holographic high density optical data storage with bacteriorhodopsin film

实验研究了基因改性菌紫质BR_D96N薄膜在不同偏振光记录下的全息存储特性,比较了不同偏振态记录光和读出光对衍射像光强及信噪比的影响.实验结果表明,与其他偏振全息记录相比,正交圆偏振光记录可实现衍射光偏振状态与散射噪声偏振状态的分离,得到高信噪比的衍射像,同时还具有高的衍射效率.以He_Ne激光器(633nm,3mW)为记录和读出光源,用空间光调制器作为数据输入元件,CCD作为数据读出器件,采用傅里叶变换全息记录的方法,在BR_D96N薄膜样品60μm×42μm的面积上进行了正交圆偏振全息数据存储,达到了2×108bit cm2的存储面密度,并实现了编码数据的无误读出与还原.

Genetic mutant bacteriorhodopsin BR-D96N film was experimentally studied on its holographic storage properties with different polarization recording waves. The influences of the different polarization states of the recording and readout waves on the retrieval diffractive image's intensity and signal-to-noise-ratio were compared with each other. The experimental results showed that compared with other polarization holographic recording, orthogonal circular polarization recording can realize the separation of the polarization state of the diffractive wave from the scattering noise, and thus has high signal-to-noise-ratio as well as high diffraction efficiency. Using He-Ne laser (633nm, 3mW) as recording and readout beam, spatial light modulator as data input element and CCD as data capture element, orthogonal circular polarization holographic optical data storage was made on 60 mu m x 42 mu m area of the BR-D96N film by Fourier transform holographic method. The area density of 2 x 10(8) bit/cm(2) was obtained, and the encoded data was retrieved without errors.