Reststrahlen material bilayers: an option for tailoring in the infrared

Area of Science:

• Materials Science
• Thermal Engineering
• Optics

Background:

• Beryllium oxide (BeO) exhibits insulating properties beneficial for frost prevention.
• Thermal radiation leakage can compromise the effectiveness of insulating materials.
• Understanding material interactions is key to optimizing thermal performance.

Purpose of the Study:

• To investigate methods for enhancing the frost-preventing properties of beryllium oxide.
• To explore the impact of substrate materials on beryllium oxide's thermal radiation characteristics.
• To optimize the design of a double-layer system for improved frost resistance.

Main Methods:

• Utilizing double-layer interference calculations to model thermal radiation.
• Analyzing the optical properties of beryllium oxide and cubic boron nitride.
• Simulating material configurations and predicting performance metrics.

Main Results:

• A substrate of cubic boron nitride (c-BN) reduces thermal radiation leak in beryllium oxide (BeO) within the 8-9.5 µm range due to its reststrahlen band.
• The configuration requires beryllium oxide as the outer layer for optimal frost-preventing performance.
• Predicted average emittance is below 20% and irradiance is 11 W/m² in the 8-13 µm window for an optimal 2.5-µm BeO layer on c-BN.

Conclusions:

• The double-layer system of beryllium oxide over cubic boron nitride significantly enhances frost-preventing capabilities.
• Optimizing layer thickness and material configuration is crucial for minimizing thermal radiation.
• This approach offers a promising strategy for developing advanced frost-resistant insulating materials.