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Three-dimensional nano-periodic liquid crystals and their application to photonic crystal device

三维纳米周期液晶及其在光子晶体器件中的应用

基本信息

批准号：
14350165
负责人：
OZAKI Masanori
金额：
$ 10.88万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

Three-dimensional nano-periodic structures based on cholesteric and chiral smectic liquid crystals having a self-organized nano-periodic structure have been investigated. The electrically tunable lasing has been observed in a focal conic structure of dye-doped cholesteric liquid crystal. This laser action is based on a helix micro-cavity in focal conic domains. Electrical tuning of the wavelength of the defect mode lasing in a one-dimensional periodic structure has been demonstrated using a stacked layer of NLC and conjugated polymer as a defect layer in the periodic structure. Lasing wavelength is widely tuned upon applying the electric field, which is due to the refractive index change in the defect layer caused by the field-induced realignment of the NLC molecules. Twist defect mode (TDM) and a lasing based on TDM have been experimentally demonstrated in a transmission spectrum of the composite film consisting of two photopolymerized cholesteric liquid crystal (PCLC) layers in which self-organized helical structure of PCLC acts as one-dimensional photonic crystal and a discontinuity of the director rotation around the helix axis at an interface of two PCLC layers induces the TDM. Optically pumped distributed feedback lasing has been proposed in a dye-doped nematic liquid crystal (NLC) waveguide by holographic excitation, in which continuous tuning of the lasing wavelength is performed upon applying electric field.

研究了基于手性近晶液晶和手性近晶液晶的三维纳米周期结构。在染料掺杂的焦锥结构液晶中观察到电调谐激光。这种激光作用是基于焦锥域中的螺旋微腔。在一维周期性结构中的缺陷模激射波长的电调谐已经被证明使用NLC和共轭聚合物的堆叠层作为周期性结构中的缺陷层。在施加电场时，激光波长被广泛地调谐，这是由于由场诱导的NLC分子的重新排列引起的缺陷层中的折射率变化。在由两层光致聚合双相液晶（PCLC）组成的复合膜的透射光谱中，实验证明了扭曲缺陷模（TDM）和基于TDM的激光输出。在复合膜中，PCLC的自组织螺旋结构充当一维光子晶体，两层PCLC界面处指向矢绕螺旋轴旋转的不连续性诱发了TDM。提出了在染料掺杂的双折射液晶（NLC）波导中利用全息激发实现光泵分布反馈激射，在光泵分布反馈激射中，通过施加电场实现激射波长的连续调谐。