Larsen George K, He Yizhuo, Ingram Whitney, LaPaquette Ethan T, Wang Jing, Zhao Yiping
Department of Physics and Astronomy, and Nanoscale Science and Engineering Center, University of Georgia, Athens, GA 30602, USA.
Nanoscale. 2014 Aug 21;6(16):9467-76. doi: 10.1039/c4nr01878h.
As chiral metamaterials become increasingly more technologically relevant, scalable, yet proficient nanofabrication methods will be needed for their production. Dynamic shadowing growth (DSG) that takes advantage of the vapor shadowing effect during physical vapor deposition is a simple and powerful tool to produce chiral nanostructures. In this report we describe several new DSG strategies for the scalable production of chiral plasmonic thin films with significant optical activity in the visible and near-infrared wavelength region. Specifically, we demonstrate that by use of metal composite (Ti/Ag) and metal/dielectric composite materials (Ag/MgF2), nanoscale helices can be fabricated using DSG at room temperature. Additionally, we show how self-assembled colloidal monolayers of nanospheres can serve as effective templates for the production of a wide variety of highly chiral films. These films can be used to construct chiral metamaterial-based devices for future applications.
随着手性超材料在技术上的相关性日益增加，其生产将需要可扩展且高效的纳米制造方法。利用物理气相沉积过程中的气相阴影效应的动态阴影生长（DSG）是一种生产手性纳米结构的简单而强大的工具。在本报告中，我们描述了几种新的DSG策略，用于可扩展地生产在可见光和近红外波长区域具有显著光学活性的手性等离子体薄膜。具体而言，我们证明通过使用金属复合材料（Ti/Ag）和金属/电介质复合材料（Ag/MgF2），可以在室温下使用DSG制造纳米级螺旋结构。此外，我们展示了纳米球的自组装胶体单层如何能够作为生产各种高度手性薄膜的有效模板。这些薄膜可用于构建基于手性超材料的器件，以供未来应用。
