Tunable absorption and selective thermal emission from engineered metals with thin dielectric coatings

mid-infrared;perfect absorber;selective thermal emission;engineered metal;highly-doped semiconductor

Streyer, William ; Wasserman ; Daniel M.

关键词: mid-infrared;    perfect absorber;    selective thermal emission;    engineered metal;    highly-doped semiconductor;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/72756/William_Streyer.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

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.