Journal
OPTICS LETTERS
Volume 33, Issue 21, Pages 2527-2529Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.33.002527
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Funding
- Department of Energy-Basic Energy Services [DE-FG02-06ER46347]
- U.S. Department of Energy (DOE) [DE-FG02-06ER46347] Funding Source: U.S. Department of Energy (DOE)
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To harness the full spectrum of solar energy, Fresnel reflection at the surface of a solar cell must be eliminated over the entire solar spectrum and at all angles. Here, we show that a multilayer nanostructure having a graded-index profile, as predicted by theory [J. Opt. Soc. Am. 66, 515 (1976); Appl. Opt. 46, 6533 (2007)], can accomplish a near-perfect transmission of all-color of sunlight. An ultralow total reflectance of 1%-6% has been achieved over a broad spectrum, lambda=400 to 1600 run, and a wide range of angles of incidence, theta=0 degrees-60 degrees. The measured angle- and wavelength-averaged total reflectance of 3.79% is the smallest ever reported in the literature, to our knowledge. (C) 2008 Optical Society of America
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