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Mid-infrared Plasmonic Circular Dichroism Generated by Graphene Nanodisk Assemblies
Xiang-Tian Kong1,2, Runbo Zhao1, Zhiming Wang1
1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China , Chengdu 610054, China.
Nano Letters
|July 18, 2017
Summary
Chiral graphene nanodisks generate strong mid-infrared circular dichroism (CD) via plasmon coupling. These graphene plasmons can enhance biomolecule vibrational signals and serve as optical components for thermal bioimaging.
Area of Science:
- Plasmonics
- Spectroscopy
- Nanotechnology
- Biophysics
Background:
- Mid-infrared (MIR) spectral interval is crucial for thermal bioimaging.
- MIR range contains vibrational lines of chiral biomolecules.
- Plasmonic circular dichroism (CD) spectroscopy is valuable for molecular analysis.
Purpose of the Study:
- To explore the potential of graphene plasmons for MIR CD spectroscopy.
- To demonstrate strong CD generation in chiral graphene assemblies in the MIR.
- To investigate the application of these structures in bioimaging and molecular sensing.
Main Methods:
- Fabrication of chiral graphene assemblies with a few graphene nanodisks.
- Utilizing plasmon-plasmon coupling between adjacent nanodisks.
- Investigating three-dimensional configurations for enhanced CD signal in the MIR.
Main Results:
- Chiral graphene assemblies generate strong MIR CD signals.
- CD strength is governed by assembly dimensions and plasmon-plasmon interaction.
- Observed both positive and negative CD bands, overlapping with biomolecular vibrational modes.
Conclusions:
- Graphene plasmons offer a viable platform for MIR CD spectroscopy.
- Chiral graphene metastructures can enhance vibrational optical activity of biomolecules.
- These structures show potential as optical components in thermal imaging devices.
