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Related Experiment Video

Updated: May 27, 2026

Fabrication and Testing of Photonic Thermometers
08:44

Fabrication and Testing of Photonic Thermometers

Published on: October 24, 2018

All-optical thermo-plasmonic device.

Pidishety Shankar1, Nirmal K Viswanathan

  • 1School of Physics, University of Hyderabad, Hyderabad-500046, India.

Applied Optics
|November 17, 2011
PubMed
Summary

We show an all-optical thermo-plasmonic effect that modulates surface plasmon resonance signals. This method uses transient photo-thermal effects in gold films for highly reproducible device performance.

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Area of Science:

  • Plasmonics
  • Optics
  • Materials Science

Background:

  • Surface plasmon resonance (SPR) is sensitive to changes in the dielectric environment.
  • Controlling SPR signals optically offers advantages for sensing and modulation.
  • Thermo-plasmonic effects can influence optical properties of metals.

Purpose of the Study:

  • To demonstrate an all-optical thermo-plasmonic effect for switching/modulating SPR signals.
  • To investigate the amplification of small changes in the dielectric constant of gold films.
  • To confirm the role of transient photo-thermal effects in device performance.

Main Methods:

  • Excitation of SPR at a metal-air interface.
  • Utilizing an Ar(+) laser to induce transient photo-thermal effects in a thin gold film.
  • Measuring changes in the complex dielectric constant (ε(m)(T)) of the gold film.

Main Results:

  • An all-optical thermo-plasmonic effect was successfully demonstrated.
  • The scheme effectively amplifies small changes in the gold film's dielectric constant.
  • Highly repeatable device performance was achieved due to transient photo-thermal effects.

Conclusions:

  • The all-optical thermo-plasmonic effect provides a method for optical switching/modulation of SPR signals.
  • Transient photo-thermal effects in the metal's dielectric constant are key to reproducible performance.
  • This technique is suitable for amplifying minute changes in dielectric properties.

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