Mid-Infrared radiative properties (absorptance, reflectance, and transmittance) of submicron gold slit arrays have been numerically studied with rigorous coupled-wave analysis and the finite difference time domain method. The slit width varies from 50 nm to 300 nm and a square feature may attach at either or both slit sides. Although the wavelength is one or two orders of magnitude longer than the side length of features, the attached nanoscale features can modify radiative properties significantly. Directional dependence on radiative properties has also been detail investigated by looking into electromagnetic fields and Poynting vectors of selected slit geometry. One possible physical mechanism, cavity resonance, account for unique radiative properties have been suggested and verified in the study as well.
Impact of Nanoscale Features of Metallic Slits on Mid-Infrared Radiative Properties
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Chen, Y, Chen, J, Fu, K, & Hsu, P. "Impact of Nanoscale Features of Metallic Slits on Mid-Infrared Radiative Properties." Proceedings of the ASME 2008 International Mechanical Engineering Congress and Exposition. Volume 10: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B, and C. Boston, Massachusetts, USA. October 31–November 6, 2008. pp. 1991-2000. ASME. https://doi.org/10.1115/IMECE2008-69256
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