Center of Information Optical Technologies, ITMO University , Saint Petersburg 197101, Russia.
Monash University , Clayton Campus, Clayton, Victoria 3800, Australia.
ACS Nano. 2017 Jul 25;11(7):7508-7515. doi: 10.1021/acsnano.7b04032. Epub 2017 Jul 14.
Large surface-to-volume ratio, one-dimensional quantum confinement, and strong optical activity make chiral nanoscrolls ideal for the detection and sensing of small chiral molecules. Here, we present a simple physical model of chiroptical phenomena in multilayered tapered semiconductor nanoscrolls. Our model is based on a linear transformation of coordinates, which converts nanoscrolls into flat but topologically distorted nanoplatelets whose optical properties can then be treated analytically. As an illustrative application example, we analyze absorption and circular dichroism spectra of CdSe nanoscrolls using an eight-band model of CdSe. We show that the optical activity of the nanoscrolls originates from the chiral distortion of their crystal lattice and determine selection rules for the optically active interband transitions. The results of our study may prove useful for the modeling and design of semiconductor nanoscrolls and nanoscroll-based materials.
大的比表面积与一维量子限域，以及强旋光性使手性纳米螺旋成为检测和感应小的手性分子的理想选择。在这里，我们提出了一个关于多层锥形半导体纳米螺旋中手征光学现象的简单物理模型。我们的模型基于坐标的线性变换，它将纳米螺旋转换为平面但拓扑上扭曲的纳米薄片，其光学性质可以通过分析来处理。作为一个说明性的应用示例，我们使用 CdSe 的八能带模型来分析 CdSe 纳米螺旋的吸收和圆二色性光谱。我们表明，纳米螺旋的旋光性源于其晶格的手征扭曲，并确定了光活性的带间跃迁的选择定则。我们研究的结果可能有助于半导体纳米螺旋和基于纳米螺旋的材料的建模和设计。
