手性液体对映体过量值的精确测量及圆偏振光的超棱镜效应研究

The chirality is one common character in the universe. It is always that only one type enantiomer of the chiral drugs can offer the effective pharmacological activity. Therefore, there is considerable interest in developing a rapid and exact method for highly sensitive determining of the enantiomeric excess. However, the frequently used polarimetry method poses a technical obstacle in the device miniaturization owing to its requirement of a relatively large amount of chiral liquid. Recently experiments have demonstrated that all the refraction, reflection, and diffraction of the two circular polarization components from the interface between a chiral and an achiral isotropic medium will undergo a minute angle divergence, which stems from a slight refractive index difference (~10-6) between the left and the right circularly polarized light. Unfortunately, the angle divergences are too small to determinate the enantiomeric excess exactly. The superprism effect, which describes the unusual dispersion property much stronger than that in conventional prisms, promises extensive applications in optical communications, e.g., wavelength division multiplexing devices. Devise as the experiments are, there is no report on the superprism effect of the circularly polarized light. Our previous works have revealed that the symmetrical metal-cladding waveguide is extremely sensitive to the optical parameters (e.g. refractive index) of the guiding layer, is independent of the polarization of incident light and can greatly enhance the Goos-Hänchen (GH) shift. The aims of the project are listed below:.(1)Taking the reflected intensity and the GH shift as the sensing prober, respectively, we will exactly determinate the enantiomeric excess of the chiral liquid;.(2)We will exactly measure the vderet constant of the magneto-optical materials;.(3)We will experimentally investigate the superprism effect of the circularly polarized light.

手性是宇宙普遍特征之一。手性药物的两种对映体，往往只有其中一种有显著的药理活性。为此有必要发展一种快速、准确的对映体过量值测定方法。传统的旋光方法样品耗量大。近年有学者发现两圆偏振光在介质与手性液体界面上的反射角、折射角和衍射角存在一微小差异，这源于手性液体对两圆偏振光的折射率不同（～10-6）。但产生的角度差异太小不足以精确测定对映体过量值。超棱镜效应，即光在传播时表现出异乎寻常的角度和波长灵敏性，在光波解复用中应用广泛。但现有的研究局限于线偏振光的情形，很少有报道圆偏振光的超棱镜效应。我们前期研究已验证双面金属包覆波导对导波层的光学参量（如折射率）极其灵敏，而偏振不灵敏，且产生的超大Goos-Hänchen（GH）位移对波长极其灵敏。本项目拟：（1）分别以反射光强和GH位移为探针，精确测定手性液体的对映体过量值；（2）精确测量磁光材料的Vderet常数；（3）实现圆偏振光的超棱镜效应

手性是宇宙普遍特征之一。手性药物的两种对映体，往往只有其中一种有显著的药理活性。近年有学者发现两圆偏振光在介质与手性液体界面上的反射角、折射角和衍射角存在一微小差异，这源于手性液体对两圆偏振光的折射率不同（～10-6）。但产生的角度差异太小不足以精确测定对映体过量值。超棱镜效应，即光在传播时表现出异乎寻常的角度和波长灵敏性，在光波解复用中应用广泛。但现有的研究局限于线偏振光的情形，很少有报道圆偏振光的超棱镜效应。. 在实验中，我们将手性液体注入双面金属包覆波导中，将入射光的偏振态在两圆偏振态之间相互转换，并测量反射光强的差值，从而可测定手性液体中的对映体过量值。因为双面金属包覆波导的反射光强及GH位移对波导层折射率改变极其灵敏，最小可测的对映体过量值，柠檬油精和香芹酮分别为1.2 %和2.1%。将入射光由单色光改为复色光，反射光点(即GH位移)会随光波长急剧变化。实验验证了圆偏振光的超棱镜效应。. 除实现项目的预定目标外，还取得了如下成果：合作撰写了光波导学术专著两本，研究了双面金属包覆波导的吸收传感特性、空气湿度传感测量、光自旋霍尔效应的增强作用、FDTD模拟了三种自由空间耦合结构的光学特性、提出了一种完美吸收体结构、提出了一种同时测量温度和曲率的方法。共发表SCI论文6篇，参加国内学术会议6次，培养研究生6名。.