全息光存储以其高密度、大容量、高速并行数据存取而成为光存储领域的一个重要研究方向。生物光致变色材料——菌紫质是一种新型可擦重写全息记录介质。实验证明了使用菌紫质薄膜进行角度复用和偏振复用全息存储的可行性。利用菌紫质的光致变色特性,采用90°角度复用全息存储光路,在BR-D96N薄膜样品同一位置上实现了6幅全息图存储,并分别读出了无串扰的再现像。利用菌紫质薄膜的光致各向异性进行了偏振复用全息存储,在BR-D96N薄膜样品的同一位置上存储了两幅正交偏振光记录的图像,用原参考光再现和偏振片选择,可分别读出这两幅图像。

Holographic data storage is a key research direction in the optical data storage field due to its high storage density, high capacity and high speed of parallel data accessing. Bacteriorhodopsin (BR), a biologically photochromic material, is a new kind of re-writable holographic recording media. The feasibility of angle multiplexing and polarization multiplexing holographic recording with BR film is proved experimentally. Based on the photochromic property of BR, using 90° angle multiplexing scheme, six holograms are recorded in the BR-D96N film and the reconstructed images are respectively read out clearly without crosstalk. Based on the photoanisotropic property of BR, polarization multiplexing holographic recording in the BR-D96N film is presented. Two images with orthogonal polarizations are recorded as two different holograms at the same position, respectively, which can be selectively retrieved with the original reference beam as readout beam and the appropriate polarizer.