This book is part of a four-volume set designed to provide students, engineers, and researchers with advanced knowledge for the design and development of architectured materials engineered to control radiative heat transfer in energy-related applications. The series is based on 14 written courses delivered during the CNRS thematic school MATTER (Architectured Materials for the Control of Radiative Heat Transfer: From Material Elaboration Processes to Industrial Applications), held from May 10–15, 2022, and organized by the French research network TAMARYS.

This second volume focuses on the experimental and modeling approaches required to determine the radiative properties of materials across multiple scales and at very high temperatures. It presents key complex dielectric functions for computing intrinsic optical properties, key measurement techniques, methods for identifying radiative parameters, and multiscale models linking microscopic structures to macroscopic radiative behavior. Special attention is given to high-temperature applications where accurate radiative data is essential