• 文献标题:   Induced chirality in micron wave through electromagnetic coupling between chiral molecules and graphene nanostructures
  • 文献类型:   Article
  • 作  者:   WANG YK, FU T, WANG TK, LI YF, ZHANG ZY
  • 作者关键词:  
  • 出版物名称:   CARBON
  • ISSN:   0008-6223 EI 1873-3891
  • 通讯作者地址:   Shaanxi Normal Univ
  • 被引频次:   6
  • DOI:   10.1016/j.carbon.2017.05.042
  • 出版年:   2017

▎ 摘  要

The intricate mechanisms of plasmon-induced circular dichroism (CD) in a visible region are considered based on chemical and physical influences, in which a simple model and formulations are required. Here, we demonstrate theoretically that plasmon-induced CD is approximately contributed by the crossinteraction between equivalent electric and magnetic dipole moments for chiral molecules and plasmon nanostructures. To prove electromagnetic couplings, we introduce graphene into plasmon nanostructures and design asymmetrically inscribed graphene dual-rings arrays (IGDAs) with high-order hybrid modes. Results show that ultrahigh-order plasmon-induced CD signals are achieved in micron wave, which is easily detected by mature microwave technology. The maximum enhancement factor of induced CD could reach up to four orders of magnitude. In addition, an induced CD signal could be tuned only by varying the Fermi energy of IGDAs rather than by varying geometric dimensions. For different molecules, the electromagnetic couplings still hold. The results could be used to dynamically design chiral sensors in biology and chemistry. (C) 2017 Elsevier Ltd. All rights reserved.