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2012-11-21
Turn a Highly-Reflective Metal into an Omnidirectional Broadband Absorber by Coating a Purely-Dielectric Thin Layer of Grating
By
Progress In Electromagnetics Research, Vol. 134, 95-109, 2013
Abstract
We show that a metal can be turned into a broadband and omnidirectional absorber by coating a purely-dielectric thin layer of grating. An optimal design for such an absorber is proposed by putting a dielectric slot waveguide grating (SWG) on the metallic substrate. The SWG consists of two germanium nanowires (Ge NWs) separated by a sub-100 nm slot in each period. Average absorption reaches 90% when the incident angle varies between 0° and 80° over a broad wavelength range from 300 nm to 1400 nm. Multiple optical mechanisms/effects, namely, diffraction, waveguiding in the high-index Ge NWs and low-index air slot, Fabry-Perot resonances as well as surface plasmon polaritons (SPPs), are identified to govern the absorption characteristics of the present absorber. The designed absorber with such a dielectric grating is easier to fabricate as compared with other absorbers with metallic structures, and has potential applications in e.g. solar cells and photodetectors.
Citation
Feng Zhang, Liu Yang, Yi Jin, and Sailing He, "Turn a Highly-Reflective Metal into an Omnidirectional Broadband Absorber by Coating a Purely-Dielectric Thin Layer of Grating," Progress In Electromagnetics Research, Vol. 134, 95-109, 2013.
doi:10.2528/PIER12102808
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