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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Refractory Plasmonics without Refractory Materials.

Gelon Albrecht1,2, Stefan Kaiser1,2, Harald Giessen2

  • 1Max Planck Institute for Solid State Research , Heisenbergstraße 1, 70569 Stuttgart, Germany.

Nano Letters
|August 31, 2017
PubMed
Summary
This summary is machine-generated.

Refractory plasmonics can be achieved without refractory materials. Gold nanostructures coated with alumina withstand high temperatures and intense laser radiation, combining gold

Keywords:
PlasmonicTHGambient atmospheregold nanostructuresrefractorythermal stability

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Plasmonics

Background:

  • Refractory plasmonics traditionally requires materials like titanium nitride (TiN) to withstand extreme conditions.
  • Gold nanostructures offer superior linear and nonlinear plasmonic properties but are typically not considered refractory.

Purpose of the Study:

  • To demonstrate that refractory plasmonics is achievable using non-refractory materials.
  • To explore the high-temperature and high-laser-intensity resilience of coated gold nanostructures.

Main Methods:

  • Overcoating gold nanostructures with aluminum oxide (alumina) using atomic layer deposition (ALD) or thick resist.
  • Subjecting the coated nanostructures to temperatures exceeding 800 °C.
  • Exposing the structures to intense laser radiation above 10 GW/cm².

Main Results:

  • Alumina-coated gold nanostructures maintained structural integrity at over 800 °C in ambient conditions.
  • The coated structures withstood intense laser radiation exceeding 10 GW/cm² without damage.
  • This demonstrates refractory capabilities in gold nanostructures.

Conclusions:

  • Refractory plasmonics is possible without using inherently refractory materials.
  • Coating gold nanostructures with alumina enables them to withstand high temperatures and intense laser pulses.
  • This approach combines the advantageous plasmonic properties of gold with high-temperature resilience.