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Related Experiment Video

Updated: Feb 25, 2026

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy
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Polarization invariant plasmonic nanostructures for sensing applications.

Landobasa Y M Tobing1, Geat-Yee Goh1, Aaron D Mueller1

  • 1Nanophotonics Lab, School of EEE, OPTIMUS, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.

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|August 10, 2017
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Summary

Researchers explored rotational symmetry in gold nanostructures for enhanced optical sensing. Increasing internal symmetry significantly boosted optical contrast under unpolarized light, improving sensing platform performance.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Optical Sensing

Background:

  • Optics-based sensing platforms are crucial for various applications.
  • Localized surface plasmon (LSP) sensing platforms offer simple excitation and cost-effectiveness.
  • However, LSPs exhibit strong polarization dependence, leading to weak optical responses under unpolarized light.

Purpose of the Study:

  • To investigate the role of rotational symmetry in designing robust optical sensing platforms.
  • To enhance optical contrast and sensitivity under unpolarized light illumination.
  • To explore gammadion and star-shaped gold nanostructures with varying rotational symmetries.

Main Methods:

  • Fabrication of gammadion and star-shaped gold nanostructures with controlled internal and external rotational symmetries.
  • Detailed characterization of their plasmonic mode properties.
  • Analysis of optical response under unpolarized light excitation.

Main Results:

  • Plasmonic modes were identified as superpositions of coupled longitudinal plasmons.
  • Introducing and increasing internal rotational symmetry enhanced optical contrast by up to ~3x under unpolarized light.
  • Rotationally symmetric nanostructures demonstrated improved sensing performance.

Conclusions:

  • Internal rotational symmetry is key to developing robust optical sensing platforms for unpolarized light.
  • Gammadion and star-shaped nanostructures offer significant advantages in optical contrast and sensitivity.
  • The findings provide a pathway for designing high-performance plasmonic sensors.