Tunable absorption and selective thermal emission from engineered metals with thin dielectric coatings
Streyer, William
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https://hdl.handle.net/2142/72756
Description
Title
Tunable absorption and selective thermal emission from engineered metals with thin dielectric coatings
Author(s)
Streyer, William
Issue Date
2015-01-21
Director of Research (if dissertation) or Advisor (if thesis)
Wasserman, Daniel M.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
mid-infrared
perfect absorber
selective thermal emission
engineered metal
highly-doped semiconductor
Abstract
The mid-infrared is a technologically important region of the electromagnetic spectrum because it includes both the peak thermal emission of objects at room temperature and the molecular absorption resonances of many common liquids and gases. Thermal sensing and imaging is widely used in industrial and defense applications, and the ability to manipulate an object’s thermal emission spectrum has important implications for enhancing or thwarting detection of an object’s thermal signature. According to Kirchhoff’s law of thermal radiation, altering an object’s emissivity is equivalent to altering its absorptivity. In this thesis, we investigate a simple planar structure for achieving tunable, polarization- and angle-independent perfect absorption in the mid-infrared. Additionally, we demonstrate tunable selective thermal emission upon heating the device.
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