Achromatic optical waveplates based on cellulose nanocrystals
Achromatic optical waveplates based on cellulose nanocrystals
复制标题
基于纤维素纳米晶体的消色差光学波片
DOI：
10.1007/s10570-021-03996-3
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发表时间：
2021-06
期刊：
影响因子：
5.7
通讯作者：
Sailing He
中科院分区：
文献类型：
--
作者：
Chenxi Li;Nan Wang;Julian Evans;Sailing He
天然纤维素衍生的纤维素纳米晶体（CNC）可以自组装成液晶（LC）并在固体膜中保持LC取向，这对于自下而上制造光学材料和器件是有吸引力的。由于CNC的固有的波长依赖性双折射，双折射取向的CNC膜为窄带波长提供所需的相位延迟。在这里，我们制作了一个1/4λ消色差的基于CNC的波片，由三层双折射CNC薄膜组成，相位延迟和慢轴方向，这是由琼斯矩阵计算，具有优化的消色差性能。通过在图案化的聚二甲基硅氧烷基底上对准掺杂有聚乙二醇的双金属CNC LC来制备三种均匀的CNC膜。通过测量透射谱对所制备的消色差波片进行了表征，在460-660 nm波长范围内，其最大相位延迟偏差约为0.06。与单双折射CNC膜相比，消色差性能提高了一个数量级。我们的基于数控的消色差波片具有良好的光学均匀性，灵活性和可定制成任意形状。
Cellulose nanocrystals (CNCs) derived from native cellulose can self-assemble into liquid crystals (LCs) and preserve the LC alignment in solid films that are attractive for the preparation of optical materials and devices from bottom-up manufacturing. Birefringent aligned CNC films provide the desired phase retardation for a narrow band of wavelengths due to the intrinsic wavelength-dependent birefringence of CNCs. Here, we produce a 1/4λachromatic CNC-based waveplate consisting of three layers of birefringent CNC films with phase retardations and slow axis directions, which are calculated by Jones Matrix, with optimized achromatic properties. Three uniform CNC films are prepared by aligning nematic CNC LCs doped with polyethylene glycol on patterned polydimethylsiloxane substrates. The fabricated achromatic waveplate is characterized by measuring the transmission spectra, and its maximum deviation of phase retardation is around 0.06 for the wavelength range of 460–660 nm. The achromatic performance is improved by one order of magnitude compared with the single birefringent CNC films. Our CNC-based achromatic waveplate has good optical homogeneity, flexibility and can be tailored into arbitrary shape.
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