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Related Experiment Video

Updated: May 30, 2026

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy
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Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy

Published on: June 5, 2019

Active modulation of nanorod plasmons.

Saumyakanti Khatua1, Wei-Shun Chang, Pattanawit Swanglap

  • 1Department of Chemistry, Rice University, Houston, Texas 77005, United States.

Nano Letters
|August 25, 2011
PubMed
Summary
This summary is machine-generated.

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Researchers developed a new method to control light at the nanoscale using gold nanorods and liquid crystals. This technique allows for 100% modulation of polarized scattering intensities, paving the way for optical circuits.

Area of Science:

  • Nanophotonics
  • Materials Science
  • Optoelectronics

Background:

  • Surface plasmons enable light confinement to nanoscale dimensions.
  • Plasmonic elements like nanorods act as optical antennas.
  • Active control of plasmonic responses is crucial for optical circuit development.

Purpose of the Study:

  • To present a novel method for actively modulating the plasmonic response of individual gold nanorods.
  • To demonstrate voltage-controlled modulation of polarized scattering intensities.
  • To overcome the roadblock in developing optical analogues of electronic circuits.

Main Methods:

  • Utilizing gold nanorods as plasmonic elements.
  • Employing liquid crystals to cover the nanorods.
  • Applying low voltages (as low as 4 V) to induce phase transitions in the liquid crystal.

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Related Experiment Videos

Last Updated: May 30, 2026

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy
08:54

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy

Published on: June 5, 2019

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
09:12

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

Published on: May 28, 2016

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
15:06

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

Published on: January 3, 2016

  • Observing the effect of homogeneous to twisted nematic phase transition on light scattering.

    • Main Results:

    • Achieved 100% modulation of polarized scattering intensities of individual gold nanorods.
    • Demonstrated that low applied voltages are sufficient to induce this modulation.
    • The effect is attributed to the liquid crystal's phase transition.

    Conclusions:

    • A new, effective method for actively controlling plasmonic elements has been developed.
    • This technique allows for precise modulation of optical antennas and other plasmonic devices.
    • The findings pave the way for the realization of advanced optical circuits and devices.