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

• 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
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350165/
• 关键词: photonic crystal; liquid crystal; cholesteric liquid crystal; helical structure; laser action; tunable photonic crystal; レーザー; 周期構造; スメクチック液晶; 波長可変レーザー

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.

已经研究了基于具有自组织纳米周期结构的胆甾型和手性近晶液晶的三维纳米周期结构。已在染料掺杂胆甾型液晶的焦锥结构中观察到电可调谐激光。这种激光作用基于焦锥域中的螺旋微腔。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，已经证明了一维周期性结构中缺陷模式激光的波长的电调谐。施加电场后，激光波长会广泛调谐，这是由于 NLC 分子的场诱导重新排列导致缺陷层中的折射率发生变化。扭曲缺陷模式 (TDM) 和基于 TDM 的激光在由两个光聚合胆甾型液晶 (PCLC) 层组成的复合薄膜的透射光谱中得到了实验证明，其中 PCLC 的自组织螺旋结构充当一维光子晶体和两个 PCLC 层界面处绕螺旋轴的指向矢旋转的不连续性引起了 TDM。通过全息激发，在染料掺杂向列液晶（NLC）波导中提出了光泵浦分布式反馈激光发射，其中在施加电场时对激光波长进行连续调谐。

项目成果

T.Matsui: "Electro-tunable Laser Action in a Dye-doped Nematic Liquid Crystal Waveguide under Holographic Excitation"Applied Physics Letters. 83. 422-424 (2003)

T.Matsui：“全息激发下染料掺杂向列液晶波导中的电可调谐激光作用”应用物理快报。

T.Matsui: "Flexible Mirrorless Laser Based on a Free-Standing Film of Photopolymerized Cholesteric Liquid Crystal"Applied Physics Letters. 81. 3741-3743 (2002)

T.Matsui：“基于光聚合胆甾液晶独立薄膜的柔性无反光镜激光器”应用物理快报。

T.Matsui: "Relaxation Kinetics of Photoinduced Surface Relief Grating on Azopolymer Films"Journal of Applied Physics. 92. 6959-6965 (2002)

T.Matsui：“偶氮聚合物薄膜上光致表面浮雕光栅的弛豫动力学”应用物理学杂志。

T.Matsui et al.: "Electro-tunable Laser Action in a Dye-doped Nematic Liquid Crystal Waveguide under Holographic Excitation"Applied Physics Letters. 83. 422-424 (2003)

T.Matsui 等人：“全息激发下染料掺杂向列液晶波导中的电可调谐激光作用”应用物理快报。

K.Funamoto et al.: "Discontinuous Shift of Lasing Wavelength with Temperature in Cholesteric Liquid Crystal"Japanese Journal of Applied Physics. 42. L1523-L1525 (2003)

K.Funamoto 等人：“胆甾型液晶中激光波长随温度的不连续变化”日本应用物理学杂志。