Enantiomorphing Chiral Plasmonic Nanostructures: A Counterintuitive Sign Reversal of the Nonlinear Circular Dichroism

Joel T. Collins, Xuezhi Zheng, Nuno V.S. Braz, Eli Slenders, Shuai Zu, Guy A.E. Vandenbosch, Victor V. Moshchalkov, Zheyu Fang, Marcel Ameloot, Paul A. Warburton, Ventsislav K. Valev

Research output: Contribution to journalArticle

8 Citations (Scopus)
55 Downloads (Pure)

Abstract

Plasmonic nanostructures have demonstrated a remarkable ability to control light in ways never observed in nature, as the optical response is closely linked to their flexible geometric design. Due to lack of mirror symmetry, chiral nanostructures allow twisted electric field "hotspots" to form at the material surface. These hotspots depend strongly on the optical wavelength and nanostructure geometry. Understanding the properties of these chiral hotspots is crucial for their applications; for instance, in enhancing the optical interactions with chiral molecules. Here, the results of an elegant experiment are presented: by designing 35 intermediate geometries, the structure is "enantiomorphed" from one handedness to the other, passing through an achiral geometry. Nonlinear multiphoton microscopy is used to demonstrate a new kind of double-bisignate circular dichroism due to enantiomorphing, rather than wavelength change. From group theory, a fundamental origin of this plasmonic chiroptical response is proposed. The analysis allows the optimization of plasmonic chiroptical materials.

Original languageEnglish
Article number1800153
JournalAdvanced Optical Materials
Volume6
Issue number14
Early online date3 May 2018
DOIs
Publication statusPublished - 18 Jul 2018

Keywords

  • Chirality
  • Chiroptical effects
  • Metamaterials
  • Nonlinear optics
  • Plasmonic

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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