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A giant chiroptical effect caused by the electric quadrupole.

Tong Wu1, Weixuan Zhang, Rongyao Wang

  • 1School of Physics and Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing, 100081, China. zhangxd@bit.edu.cn.

Nanoscale
|April 8, 2017
PubMed
Summary

Electric quadrupoles significantly enhance plasmon-induced circular dichroism (CD) in chiral biomolecules, offering a new strategy for ultrasensitive detection. This finding challenges the traditional dipole approximation in plasmonic nanostructures.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Biomolecular Spectroscopy

Background:

  • Plasmonic particles are crucial for ultrasensitive biomolecule detection in biomedical and pharmaceutical fields.
  • Current theories for plasmon-induced circular dichroism (CD) rely on the dipole approximation, often neglecting electric quadrupolar contributions.

Purpose of the Study:

  • To investigate the significance of electric quadrupolar contributions in plasmon-induced CD.
  • To demonstrate that electric quadrupoles play a key role in plasmonic CD, especially in chiral media with preferential molecular orientations.

Main Methods:

  • Theoretical analysis of plasmon-induced circular dichroism.
  • Investigation of plasmonic nanostructures and chiral media with preferential molecular orientations.
  • Focus on electric quadrupolar (EQ) contributions to plasmonic CD.

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Main Results:

  • Electric quadrupolar contributions to plasmonic CD strength can be up to two orders of magnitude higher than dipole contributions.
  • EQ-associated plasmonic CD activity is linked to plasmonic resonance absorptions and enhanced near-fields with steep electric field gradients.
  • EQ contributions correlate with the boosted emission rate of molecular electric quadrupoles.

Conclusions:

  • The electric quadrupolar contribution is essential and cannot be ignored in plasmon-induced CD, particularly in specific nanostructure-medium configurations.
  • Understanding EQ contributions enables the design of nanostructures for giant chiroptical effects.
  • This provides a novel strategy for ultrasensitive detection and quantification of molecular chirality.