期刊
OPTICS EXPRESS
卷 22, 期 9, 页码 A930-A940出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.22.00A930
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资金
- Office of Science of the U.S. Department of Energy [DE-SC0004993]
- National Science Foundation [DGE-1144469]
- Caltech Summer Undergraduate Research Fellowship
We report design methods for achieving near-unity broadband light absorption in sparse nanowire arrays, illustrated by results for visible absorption in GaAs nanowires on Si substrates. Sparse (<5% fill fraction) nanowire arrays achieve near unity absorption at wire resonant wavelengths due to coupling into 'leaky' radial waveguide modes of individual wires and wire-wire scattering processes. From a detailed conceptual development of radial mode resonant absorption, we demonstrate two specific geometric design approaches to achieve near unity broadband light absorption in sparse nanowire arrays: (i) introducing multiple wire radii within a small unit cell array to increase the number of resonant wavelengths, yielding a 15% absorption enhancement relative to a uniform nanowire array and (ii) tapering of nanowires to introduce a continuum of diameters and thus resonant wavelengths excited within a single wire, yielding an 18% absorption enhancement over a uniform nanowire array. (C) 2014 Optical Society of America
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