Journal
OPTICS LETTERS
Volume 40, Issue 11, Pages 2592-2595Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.40.002592
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Funding
- Ralph E. Powe Junior Faculty Enhancement Award
- National Science Foundation [CBET-1402743]
- Center for Nanoscale Materials, a U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences User Facility [DE-AC02-06CH11357]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [GRANTS:13902856] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1402743] Funding Source: National Science Foundation
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Broadband perfect absorber based on one ultrathin layer of the refractory metal chromium without structure patterning is proposed and demonstrated. The ideal permittivity of the metal layer for achieving broadband perfect absorption is derived based on the impedance transformation method. Since the permittivity of the refractory metal chromium matches this ideal permittivity well in the visible and near-infrared range, a silica-chromium-silica three-layer absorber is fabricated to demonstrate the broadband perfect absorption. The experimental results under normal incidence show that the absorption is above 90% over the wavelength range of 0.4-1.4 mu m, and the measurements under angled incidence within 400-800 nm prove that the absorber is angle-insensitive and polarizationindependent. (C) 2015 Optical Society of America
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