Enhancing the circular polarization degree of NIR-II circularly polarized light of cellulose nanocrystal films
Enhancing the circular polarization degree of NIR-II circularly polarized light of cellulose nanocrystal films
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DOI：
10.1007/s10570-023-05424-0
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发表时间：
2023-08
期刊：
影响因子：
5.7
通讯作者：
Di Lu;Xiao Yu;Shoujun Zhu;Yan Xu
中科院分区：
文献类型：
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作者：
Di Lu;Xiao Yu;Shoujun Zhu;Yan Xu
圆偏振光在第二近红外窗口（NIR-II CPL）中具有穿透深度深、光吸收少等独特的优点，在生物医学应用中具有广阔的应用前景。迄今为止，高性能NIR-II CPL材料的构建仍然具有挑战性。本文报道了超声波对纤维素纳米晶体（CNC）悬浮液的应用，使薄膜光子带隙红移到近红外区；在并发，焦点圆锥相形式，其嵌入自组装手性向列数控薄膜可以通过保持薄膜厚度低于临界值消除。我们提出了多层叠合无焦锥相的CNC薄膜，提供了一种在1430 nm处产生圆偏振度为0.556的右手NIR-II CPL的一般方法。最后，我们证明了层压CNC薄膜的1430 nm处的右手CPL为区分人类癌症组织提供了额外的光学诊断工具。图形抽象
Circularly polarized light in the second near-infrared window (NIR-II CPL) features a unique set of advantages such as deep penetration depth and reduced light absorption, which holds promising potentials for biomedical applications. To date, high-performance NIR-II CPL materials remain challenging to construct. Here, we report that the application of ultrasonication to cellulose nanocrystal (CNC) suspensions red-shifts the film photonic bandgap to the NIR region; in concurrent, focal conic phase forms whose intercalation within self-assembled chiral nematic CNC films can be eliminated by keeping the film thickness below a critical value. We present that multilayer lamination of thin CNC films absence of focal conic phase affords a general approach to produce right-handed NIR-II CPL with the degree of circular polarization of 0.556 at 1430 nm. Finally, we demonstrate that the right-handed CPL at 1430 nm of the laminated CNC film offers an extra optical diagnostic tool for the discrimination of human cancer tissues.Graphical abstract