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Updated: Dec 29, 2025

Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron

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Broadband, High-Temperature Stable Reflector for Aerospace Thermal Radiation Protection.

George Christidis¹, Ueli Koch¹, Erik Poloni²

¹Department of Information Technology and Electrical Engineering, Institute of Electromagnetic Fields , ETH Zurich , 8092 Zurich , Switzerland.

ACS Applied Materials & Interfaces

|February 1, 2020

Summary

This summary is machine-generated.

Researchers developed a thermally stable photonic heterostructure with high reflectivity. This material, when used as an additive in composites, significantly enhances their broadband reflection for advanced thermal protection systems.

Keywords:

ceramics composite materials functional coatings photonic crystals thin films

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Area of Science:

Materials Science
Optics
Nanotechnology

Background:

Photonic heterostructures offer tunable optical properties.
High reflectivity and thermal stability are crucial for advanced materials.
Existing materials often lack combined broadband reflectivity and high-temperature performance.

Purpose of the Study:

To design and fabricate a simple, thermally stable photonic heterostructure with high average reflectivity.
To investigate the temperature-reversible reflective properties of the heterostructure.
To demonstrate the enhancement of composite material reflectivity using heterostructure platelets as additives for thermal protection systems (TPS).

Main Methods:

Fabrication of a 10-layer dielectric coating on a tantalum (Ta) metallic substrate.
Characterization of average reflectivity (⟨R⟩) and wavelength range.
Testing of temperature-reversible reflective properties up to 1000 °C.
Incorporation of heterostructure platelets into an organic matrix.

Main Results:

Achieved high average reflectivity (⟨R⟩ ≈ 88.8%) over a broad wavelength range (920-1450 nm).
Demonstrated temperature-reversible reflective properties up to 1000 °C.
Enhanced organic matrix reflectivity from 5% to an average of 55% over a 1000 nm range.

Conclusions:

The developed photonic heterostructure provides superior optical and thermal properties.
Heterostructure platelets serve as effective additives to enhance the broadband reflection of composite materials.
This technology shows promise for next-generation thermal protection systems.