Lee Taewoo, Mundoor Haridas, Gann Derek G, Callahan Timothy J, Smalyukh Ivan I
Department of Physics and Liquid Crystal Materials Research Center, University of Colorado, Boulder, Colorado 80309, USA.
Opt Express. 2013 May 20;21(10):12129-34. doi: 10.1364/OE.21.012129.
We demonstrate an approach for background-free three-dimensional imaging of director fields in liquid crystals using stimulated Raman scattering microscopy. This imaging technique is implemented using a single femtosecond pulsed laser and a photonic crystal fiber, providing Stokes and pump frequencies needed to access Raman shifts of different chemical bonds of molecules and allowing for chemically selective and broadband imaging of both pristine liquid crystals and composite materials. Using examples of model three-dimensional structures of director fields, we show that the described technique is a powerful tool for mapping of long-range molecular orientation patterns in soft matter via polarized chemical-selective imaging.
我们展示了一种利用受激拉曼散射显微镜对液晶指向矢场进行无背景三维成像的方法。这种成像技术是通过使用单个飞秒脉冲激光器和光子晶体光纤来实现的，它能提供访问分子不同化学键拉曼位移所需的斯托克斯和泵浦频率，并允许对原始液晶和复合材料进行化学选择性和宽带成像。通过指向矢场的三维模型结构示例，我们表明所描述的技术是一种通过偏振化学选择性成像来绘制软物质中长程分子取向模式的强大工具。
