Broadband Superabsorber Operating at 1500 °C Using Dielectric Bilayers.

Area of Science:

• Photonics
• Materials Science
• Optical Engineering

Background:

• Photonic devices require thermal stability for high-temperature applications.
• Current nanostructure-based devices degrade at high temperatures due to surface diffusion.
• Developing materials with stable optical properties at extreme temperatures is crucial.

Purpose of the Study:

• To engineer a thermo-optically stable superabsorber for high-temperature photonic applications.
• To overcome the temperature limitations of existing nanostructure-based photonic devices.

Main Methods:

• Fabrication of a superabsorber using bilayer refractory dielectric materials.
• Characterization of optical properties, specifically absorptivity, across a broad bandwidth.
• Testing of thermal stability and temperature dependence of optical performance up to 1500 °C.

Main Results:

• The superabsorber achieved an average absorptivity of approximately 95% over a >500 nm bandwidth in the near-infrared spectrum.
• The device exhibited minimal temperature dependence, maintaining performance up to 1500 °C.
• Demonstrated significant improvement in thermal stability compared to state-of-the-art nanostructure devices.

Conclusions:

• Bilayer refractory dielectric materials offer a pathway to highly thermo-optically stable photonic devices.
• The developed superabsorber is suitable for high-temperature technological applications in photonics.
• This work presents a novel approach to achieving robust photonic devices for extreme environments.