基于细菌视紫红质薄膜的空间光调制器实验研究

A study on spatial light modulator of bacteriorhodopsin film

阐述了利用细菌视紫红质薄膜 (BR薄膜 )优良的非线性光学特性作为光寻址的空间光调制器的实验研究 .BR有两个重要的光敏中间态 (B态和M态 ) ,其吸收带 (B态吸收峰为 5 70nm ,M态吸收峰为 4 12nm)重叠区域较少 ,利用其正向 (B→M)和逆向 (M→B)光反应之间转化关系和B态与M态的差异吸收实现了相干光学图像到非相干光学图像的转换实验 .采用经基因改性的细菌视紫红质薄膜 (BRD96N)材料 ,使用 6 70nm相干光作为写入光 ,5 30nm非相干光作为读出光 ,得到了分辨率约为 2 0 0lines mm ,对比度约为 2 .1∶1的实验结果 .

An optically addressed spatial light modulator (OA-SLM) is presented by using the excellent nonlinear-optical characteristics of bacteriorhodopsin films ( 1311 films). The BR films have two dominant photoactive states ( B state and M state) which have well-separated absorption bands with maxima of B state at 570nm and M state at 412nm. Using the ratio of the shift between the forward (B-->M)and backward( M-->B) photoreactions, the experimental study on the conversion of coherent-to-incoherent image is realized on BR films. Using the genetic manipulation of the BRD96N film as a sample, the 670nm coherent light as a writing light and the 530nm incoherent light as a readout light, the experimental results for the resolution of similar to 200 lines/mm and the contrast of about 2.1 : 1 are achieved.