Uncovering the Circular Polarization Potential of Chiral Photonic Cellulose Films for Photonic Applications
Uncovering the Circular Polarization Potential of Chiral Photonic Cellulose Films for Photonic Applications
复制标题
揭示用于光子应用的手性光子纤维素薄膜的圆偏振潜力
DOI：
10.1002/adma.201705948
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发表时间：
2018-03-27
影响因子：
29.4
通讯作者：
Xu, Yan
中科院分区：
文献类型：
--
作者：
Zheng, Hongzhi;Li, Wanru;Xu, Yan
圆偏振光 (CPL) 是光子技术的核心。一个关键的挑战在于开发一种通用路线，使用适合放大的低成本原材料来生成具有定制手性光学活性的 CPL。这项研究表明，具有光子带隙 (PBG) 和左旋螺旋方向的纤维素薄膜具有固有的圆偏振能力，从而导致基于 PBG 的 CPL 具有非凡的值、良好的旋向性以及通过 PBG 变化可定制的波长。使用这种纤维素薄膜，从近紫外到近红外范围内的入射光可以转换为被动L-CPL和R-CPL，具有与观察侧相关的旋向性和高达0.87的Ol值，并且自发发射转换为R-CPL发射，垂直条g垂直条值高达0.68。前所未有的证据表明 PBG 效应可以刺激 R-CPL 发射。说明了基于纤维素的 CPL 薄膜用于基于偏振的加密的潜力。蒸发诱导的自组装与纤维素纳米晶体的纳米介晶相结合，为技术进步开辟了新的途径，并为光子应用有机和无机 CPL 薄膜的合理设计和可扩展制造提供了通用策略。
Circularly polarized light (CPL) is central to photonic technologies. A key challenge lies in developing a general route for generation of CPL with tailored chiroptical activity using low-cost raw materials suitable for scaleup. This study presents that cellulose films with photonic bandgaps (PBG) and left-handed helical sense have an intrinsic ability for circular polarization leading to PBG-based CPL with extraordinary values, well-defiend handedness, and tailorable wavelength by the PBG change. Using such cellulose films, incident light ranging from near-UV to near-IR can be transformed to passive L-CPL and R-CPL with viewing-side-dependent handedness and Ol values up to 0.87, and spontaneous emission transformed to R-CPL emission with vertical bar g vertical bar values up to 0.68. Unprecedented evidence is presented with theoretical underpinning that the PBG effect can stimulate the R-CPL emission. The potential of cellulose-based CPL films for polarization-based encryption is illustrated. The evaporation-induced self-assembly coupled with nanoscale mesogens of cellulose nanocrystals opens new venues for technological advances and enables a versatile strategy for rational design and scalable manufacturing of organic and inorganic CPL films for photonic applications.