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Infrared Absorption of Laser Patterned Sapphire Al2O3 for Radiative Cooling.

Nan Zheng1, Daniel Smith1, Soon Hock Ng1

  • 1Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials (SEAM), School of Science, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.

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Summary
This summary is machine-generated.

Femtosecond laser ablation created micro-gratings on sapphire, enhancing thermal emission. This technique improves infrared emissivity and offers tailored phononic absorption for sensor applications.

Keywords:
anti-reflective surfacesdirect energy depositionfemtosecond laser ablationradiative cooling

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Laser Physics

Background:

  • Sapphire (Al2O3) is a key material in optical and electronic applications.
  • Controlling thermal emission is crucial for infrared sensor technology.
  • Femtosecond laser ablation offers precise micro-structuring capabilities.

Purpose of the Study:

  • To spectrally characterize the thermal emission of femtosecond laser-ablated micro-gratings on sapphire.
  • To investigate the influence of micro-grating patterns on infrared emissivity.
  • To explore the potential for tailored phononic absorption using laser inscription.

Main Methods:

  • Spectral characterization of reflectance (R) for linear and circular micro-gratings on c-plane sapphire.
  • Utilizing an infrared (IR) camera to measure blackbody radiation temperature and emissivity.
  • Employing a back-side ablation technique on transparent sapphire substrates.

Main Results:

  • Micro-gratings exhibited (3-6)% larger emissivity compared to untreated sapphire.
  • Azimuthal emission followed a Lambertian profile (∝cosθ) in the 7.5-13 μm band.
  • Back-side ablation minimized debris and maximized energy deposition at the exit interface.

Conclusions:

  • Femtosecond laser ablation is effective for enhancing thermal emission from sapphire micro-gratings.
  • The back-side ablation method is advantageous for processing transparent substrates.
  • Laser-inscribed gratings allow for tailored phononic absorption in the Reststrahlen region (20-30 μm).