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Extrinsic Chirality by Interference between Two Plasmonic Modes on an Achiral Rectangular Nanostructure.

Tomoya Oshikiri1, Quan Sun1, Hiroki Yamada1

  • 1Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0021, Japan.

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|September 28, 2021
PubMed
Summary
This summary is machine-generated.

Researchers observed chiral optical near fields on achiral gold nanostructures using circularly polarized light. This extrinsic chirality arises from the interference of plasmonic modes, explained by a classical oscillator model.

Keywords:
chiralitylocalized surface plasmon resonancemode interferencenear-field imagingphotoemission electron microscopy

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Chirality

Background:

  • Optical near fields (NF) induced by circularly polarized light (CPL) are a significant area of research.
  • Understanding chiral NFs on achiral structures is crucial for advanced optical applications.

Purpose of the Study:

  • To investigate the generation of chiral optical near fields on achiral nanostructures under CPL irradiation.
  • To elucidate the underlying mechanism of extrinsic chirality in optical near fields.

Main Methods:

  • Utilized multiphoton photoemission electron microscopy (MP-PEEM) to observe chiral NF intensity distributions.
  • Employed a classical oscillator model in conjunction with experimental data and simulations.

Main Results:

  • Observed a chiral NF intensity distribution on achiral gold nanorectangular structures (Au-NRs) under CPL.
  • Investigated differential NF spectra, quantifying the asymmetry of the NF intensity.
  • Proposed and validated a model where extrinsic chirality arises from the interference of two plasmonic modes.

Conclusions:

  • The chiral NF intensity distribution on achiral nanostructures is extrinsically generated.
  • The interference between plasmonic modes is the key mechanism for extrinsic chirality.
  • NF intensity and phase angle of plasmonic modes under linearly polarized light are critical for extrinsic chirality generation.