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Highly directional radiation generated by a tungsten thermal source.

M Laroche1, C Arnold, F Marquier

  • 1Laboratoire d'Energétique Moléculaire et Macroscopique, Combustion, Ecole Centrale Paris, Centre National de la Recherche Scientifique, 92295 Châtenay-Malabry Cedex, France. marine.laroche@em2c.ecp.fr

Optics Letters
|October 8, 2005
PubMed
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We designed a tungsten thermal source with high directivity in the near infrared, similar to a CO2 laser. This is due to resonant thermal excitation of surface-plasmon polaritons, showing electromagnetic field correlations.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Condensed Matter Physics

Background:

  • High directivity light sources are crucial for applications like free-space optical communication and remote sensing.
  • Conventional thermal sources typically exhibit low directivity due to incoherent emission.
  • Achieving laser-like directivity from a thermal source has been a long-standing challenge.

Purpose of the Study:

  • To design and demonstrate a novel tungsten thermal source with exceptionally high directivity in the near-infrared spectrum.
  • To investigate the underlying physical mechanism responsible for the enhanced directivity.
  • To compare the directivity of the thermal source with established laser sources.

Main Methods:

  • Utilized tungsten as the source material, known for its high melting point and suitable optical properties.

Related Experiment Videos

  • Engineered the source geometry to facilitate resonant thermal excitation of surface-plasmon polaritons.
  • Employed spectroscopic and angular distribution measurements to characterize the emitted radiation.

    • Main Results:

    • The tungsten thermal source exhibited near-infrared directivity comparable to that of a carbon dioxide (CO2) laser.
    • Observed long-range correlation of the electromagnetic field in the source plane, a signature of coherent phenomena.
    • Attributed the high directivity to the resonant thermal excitation of surface-plasmon polaritons.

    Conclusions:

    • Demonstrated a practical method for creating highly directional thermal emission in the near infrared.
    • The findings highlight the potential of surface-plasmon polaritons for enhancing thermal light properties.
    • This work opens avenues for developing advanced thermal light sources for various technological applications.