Date of Award
Doctor of Philosophy (PhD)
Department of Engineering Physics
Michael A. Marciniak, PhD.
Thermal emission, exhibiting antenna-like directivity, has been generated by a wide variety of both simple and complex micro-structures. The basic demonstrations of directional emission, and specific device performance evaluations, have been conducted at elevated temperatures, typically several hundred degrees Celsius. The most common applications for these high-temperature designs are thermal photo-voltaic and spectroscopic sources. A wide range of lower temperature applications, such as spacecraft thermal management and mid- to far-infrared optical train stray light management, are precluded by the cost and complexity of the fabrication processes employed. In this work, a novel fabrication and physical surface optimization of a seminal directionally emitting structure is conducted in metalized plastic. The fabrication method is derived from the high-throughput compact disc manufacturing process and exploits the advantageous surface electromagnetic properties of aluminium, at the expense of forgoing high-temperature operation. Then, a novel directionally emitting structure, exhibiting a broader angular response, is design and fabricated by the same methods. The performance of both structures is evaluated through reflectance and self-emission measurements, and compared to rigorous modeling results. The necessity of conducting low-temperature emission and reflectance measurements, on instruments designed for radiometry rather than scatterometry, requires consideration of the longitudinal spatial coherence of field incidence on the surface. To this end, a well-developed modeling method was extended to include finite longitudinal spatial coherence excitation.
DTIC Accession Number
Seal, Michael D., "Directional Thermal Emission and Absorption from Surface Microstructures in Metalized Plastics" (2013). Theses and Dissertations. 943.