期刊
NANO LETTERS
卷 11, 期 4, 页码 1851-1856出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl200201b
关键词
Vertical silicon nanowire; waveguiding; selective absorption; color filtering; photodetection
类别
资金
- Zena Technologies
- U.S. Department of Energy, Office of Science
- Office of Basic Energy Sciences [DE-SC0001088]
- U.S. Department of Energy (DOE) [DE-SC0001088] Funding Source: U.S. Department of Energy (DOE)
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1307561] Funding Source: National Science Foundation
We demonstrate that vertical silicon nanowires take on a surprising variety of colors covering the entire visible spectrum, in marked contrast to the gray color of bulk silicon. This effect is readily observable by bright field microscopy, or even to the naked eye. The reflection spectra of the nanowires each show a dip whose position depends on the nanowire radii. We compare the experimental data to the results of finite difference time domain simulations to elucidate the physical mechanisms behind the phenomena we observe. The nanowires are fabricated as arrays, but the vivid colors arise not from scattering or diffractive effects of the array, but from the guided mode properties of the individual nanowires. Each nanowire can thus define its own color, allowing for complex spatial patterning. We anticipate that the color filter effect we demonstrate could be employed in nanoscale image sensor devices.
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