High contrast, ultrafast optically addressed ultraviolet light modulator based upon optical anisotropy in ZnO films grown on R-plane sapphire
High contrast, ultrafast optically addressed ultraviolet light modulator based upon optical anisotropy in ZnO films grown on R-plane sapphire
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DOI：
10.1063/1.124223
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发表时间：
1999-01
影响因子：
4
通讯作者：
M. Wraback;H. Shen;S. Liang;C. Gorla;Yicheng Lu
中科院分区：
文献类型：
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作者：
M. Wraback;H. Shen;S. Liang;C. Gorla;Yicheng Lu
利用（0112）蓝宝石衬底上外延生长的ZnO薄膜的光学各向异性，研制了一种光寻址的紫外光调制器。该装置实现了高对比度和高速度，利用各向异性漂白的各向异性吸收和随之而来的超快偏振旋转附近的最低激子共振产生的飞秒紫外脉冲。所得调制的特征是对比度为70：1，对应于12°的动态偏振旋转，并且在100 ps内衰减到准平衡值。
An optically addressed ultraviolet light modulator has been demonstrated which exploits the optical anisotropy in a ZnO film epitaxially grown on (0112) sapphire. This device achieves both high contrast and high speed by exploiting the anisotropic bleaching of the anisotropic absorption and concomitant ultrafast polarization rotation near the lowest exciton resonances produced by femtosecond ultraviolet pulses. The resultant modulation is characterized by a contrast ratio of 70:1, corresponding to a dynamic polarization rotation of 12°, and it decays to a quasiequilibrium value within 100 ps.