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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Active Plasmonics and Active Chiral Plasmonics through Orientation-Dependent Multipolar Interactions.

Peter R Stevenson1, Matthew Du2, Charles Cherqui3

  • 1Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States.

ACS Nano
|August 14, 2020
PubMed
Summary

Orientation control of passive plasmonic materials offers a simple method to achieve active plasmonic and chiral plasmonic responses. This technique tunes optical extinction and switches chiroptical handedness by manipulating substrate orientation relative to incident light.

Keywords:
active plasmonicsanisotropychiral plasmonicsextrinsic chiralitylocalized surface plasmon resonancemagnetoelectric effect

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Materials Science

Background:

  • Active plasmonic metamaterials typically rely on complex responsive designs.
  • Passive plasmonic materials, while simpler to fabricate, lack post-fabrication tunability.
  • Controlling light-matter interactions is key to advanced optical functionalities.

Purpose of the Study:

  • To demonstrate a simple method for achieving active plasmonic and chiral plasmonic responses from passive plasmonic materials.
  • To explore the use of substrate orientation control for tuning optical properties.
  • To investigate the role of multipolar effects in orientation-dependent plasmonic behavior.

Main Methods:

  • Utilizing gold nanocrescents as a model system for passive plasmonic structures.
  • Implementing substrate orientation control relative to incident light polarization and angle.
  • Characterizing optical extinction and chiroptical responses (Δg) as a function of orientation.
  • Correlating observed responses with multipolar polarizabilities (magnetoelectric, dipole-quadrupole).

Main Results:

  • Achieved tunable optical extinction ranging from -21% to +36% by varying substrate orientation.
  • Demonstrated controllable switching of chiroptical handedness (Δg = ± 0.55).
  • Linked active plasmonic and chiral responses to the multipolar character of resonant modes.
  • Observed sensitivity of optical characterization to subtle structural variations (tip asymmetry).

Conclusions:

  • Substrate orientation control provides a facile route to active plasmonics and chiral plasmonics using passive materials.
  • Multipolar effects, including magnetoelectric and dipole-quadrupole polarizabilities, govern orientation-dependent light-matter interactions.
  • Orientation-dependent optical characterization is highly sensitive to electromagnetic field gradients and nanoscale structural details.