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Related Experiment Video

Updated: Sep 1, 2025

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Designing two-dimensional temperature profiles using tunable thermoplasmonics.

Sergey S Kharintsev1, Anton V Kharitonov1, Elena A Chernykh1

  • 1Department of Optics and Nanophotonics, Institute of Physics, Kazan Federal University, Kremlevskaya, 16, Kazan, 420008, Russia. skharint@gmail.com.

Nanoscale
|August 12, 2022
PubMed
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The Journal of chemical physics·2024

Precise optical heating control in nanostructures is now possible by tuning heat exchange with a silicon waveguide heatsink. This method allows for significant temperature variations in titanium nitride nanoheaters at fixed laser power.

Area of Science:

  • Thermonanophotonics
  • Plasmonics
  • Nanoscale heat transfer

Background:

  • Plasmon resonance in metallic nanostructures enables efficient light absorption and optical heating.
  • Controlling nanoscale temperature precisely at fixed laser power is a significant challenge.
  • Heat exchange with a thermostat influences nanostructure temperature increments.

Purpose of the Study:

  • To demonstrate tunable optical heating of plasmonic nanostructures by controlling heat exchange.
  • To implement precise tailoring of optical heating at a fixed pump power.
  • To achieve programmable non-uniform temperature profiles in steady-state.

Main Methods:

  • Utilizing a 1D waveguide heatsink (silicon pillars) to slow heat exchange between the nanostructure and thermostat.

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Last Updated: Sep 1, 2025

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  • Fabricating stacked titanium nitride (TiN) nanoheaters and height-controlled silicon (Si) waveguide heatsinks.
  • Measuring temperature remotely via Raman shift of the Si pillar and using ellipsometry.

    • Main Results:

    • Temperature rise in TiN:Si voxels varied from hundreds to thousands of degrees Celsius based on Si pillar height, at fixed pump power.
    • A temperature threshold of 400 °C was identified, above which TiN degrades due to oxidation.
    • Tunable thermal gradients were achieved by varying permittivity of TiN:Si voxels of equal size.

    Conclusions:

    • Demonstrated a method for precise, tunable optical heating of plasmonic nanostructures.
    • Enabled programmable non-uniform temperature profiles using TiN:Si voxels.
    • Opened avenues for tunable thermoplasmonics and thermo-optical applications.