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首页> 美国卫生研究院文献>Scientific Reports >High efficiency holographic Bragg grating with optically prolonged memory
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High efficiency holographic Bragg grating with optically prolonged memory

机译：具有光学延长存储功能的高效全息布拉格光栅

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摘要

In this paper, we show that photosensitive azo-dye doped Blue-phase liquid crystals (BPLC) formed by natural molecular self-assembly are capable of high diffraction efficiency holographic recording with memory that can be prolonged from few seconds to several minutes by uniform illumination with the reference beam. Operating in the Bragg regime, we have observed 50 times improvement in the grating diffraction efficiency and shorter recording time compared to previous investigations. The enabling mechanism is BPLC’s lattice distortion and index modulation caused by the action of light on the azo-dopant; upon photo-excitation, the azo-molecules undergo transformation from the oblong-shaped Trans-state to the bent-shaped Cis-state, imparting disorder and also cause the surrounding BPLC molecules to undergo coupled flow & reorientation leading to lattice distortion and index modulation. We also showed that the same mechanism at work here that facilitates lattice distortion can be used to frustrate free relaxation of the lattice distortion, thereby prolonging the lifetime of the written grating, provided the reference beam is kept on after recording. Due to the ease in BPLC fabrication and the availability of azo-dopants with photosensitivity throughout the entire visible spectrum, one can optimize the controlling material and optical parameters to obtain even better performance.
机译：在本文中，我们表明通过自然分子自组装形成的光敏偶氮染料掺杂的蓝相液晶（BPLC）能够以存储方式实现高衍射效率的全息记录，并可以通过均匀照明将其从几秒钟延长到几分钟与参考光束。与之前的研究相比，在布拉格系统下进行操作，我们发现光栅衍射效率提高了50倍，记录时间缩短了。启用机制是BPLC的晶格畸变和折射率调制，这是由光对偶氮掺杂剂的作用引起的。光激发后，偶氮分子会从长方形的反式转变为弯曲的顺式，赋予无序度，并导致周围的BPLC分子发生耦合流动和重新取向，从而导致晶格畸变和折射率调制。我们还表明，此处使用的促进晶格畸变的相同机制可用于阻止晶格畸变的自由松弛，从而延长写入光栅的寿命，前提是在记录后保持参考光束不变。由于BPLC易于制造，并且在整个可见光谱中都具有光敏性偶氮掺杂剂，因此人们可以优化控制材料和光学参数以获得更好的性能。

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