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Colorful InAs Nanowire Arrays: From Strong to Weak Absorption with Geometrical Tuning.

Wu, Phillip LU ; Anttu, Nicklas LU ; Xu, Hongqi LU ; Samuelson, Lars LU and Pistol, Mats-Erik LU (2012) In Nano Letters 12(4). p.1990-1995
Abstract
One-dimensional nanostructure arrays can show fascinatingly different, tunable optical response compared to bulk systems. Here we study theoretically and demonstrate experimentally how to engineer the reflection and absorption of light in epitaxially grown vertical arrays of InAs nanowires (NWs). A striking observation is optically visible colors of the array, which we show can be tuned depending on the geometrical parameters of the array. Specifically, larger diameter NW arrays absorb light more effectively out to a longer wavelength compared to smaller diameter arrays. Thus, controlling the diameter provides a way to tune the optically observable color of an array. We also find that arrays with a larger amount of InAs material reflect... (More)
One-dimensional nanostructure arrays can show fascinatingly different, tunable optical response compared to bulk systems. Here we study theoretically and demonstrate experimentally how to engineer the reflection and absorption of light in epitaxially grown vertical arrays of InAs nanowires (NWs). A striking observation is optically visible colors of the array, which we show can be tuned depending on the geometrical parameters of the array. Specifically, larger diameter NW arrays absorb light more effectively out to a longer wavelength compared to smaller diameter arrays. Thus, controlling the diameter provides a way to tune the optically observable color of an array. We also find that arrays with a larger amount of InAs material reflect less light (or absorb more light) than arrays with less material. On the basis of these two trends, InAs NW arrays can be designed to absorb light either much more or much less efficiently than a thin film of an effective medium containing the same amount of InAs as the NW array. The tunable absorption and low area filling factor of the NW arrays compared to thin film bode well for III-V photovoltaics and photodetection. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nano Letters
volume
12
issue
4
pages
1990 - 1995
publisher
The American Chemical Society
external identifiers
  • wos:000302524600042
  • pmid:22409436
  • scopus:84859712592
ISSN
1530-6992
DOI
10.1021/nl204552v
language
English
LU publication?
yes
id
421fa49a-806b-4120-b35e-8560bb673627 (old id 2431937)
date added to LUP
2012-04-04 14:08:16
date last changed
2017-10-01 04:00:44
@article{421fa49a-806b-4120-b35e-8560bb673627,
  abstract     = {One-dimensional nanostructure arrays can show fascinatingly different, tunable optical response compared to bulk systems. Here we study theoretically and demonstrate experimentally how to engineer the reflection and absorption of light in epitaxially grown vertical arrays of InAs nanowires (NWs). A striking observation is optically visible colors of the array, which we show can be tuned depending on the geometrical parameters of the array. Specifically, larger diameter NW arrays absorb light more effectively out to a longer wavelength compared to smaller diameter arrays. Thus, controlling the diameter provides a way to tune the optically observable color of an array. We also find that arrays with a larger amount of InAs material reflect less light (or absorb more light) than arrays with less material. On the basis of these two trends, InAs NW arrays can be designed to absorb light either much more or much less efficiently than a thin film of an effective medium containing the same amount of InAs as the NW array. The tunable absorption and low area filling factor of the NW arrays compared to thin film bode well for III-V photovoltaics and photodetection.},
  author       = {Wu, Phillip and Anttu, Nicklas and Xu, Hongqi and Samuelson, Lars and Pistol, Mats-Erik},
  issn         = {1530-6992},
  language     = {eng},
  number       = {4},
  pages        = {1990--1995},
  publisher    = {The American Chemical Society},
  series       = {Nano Letters},
  title        = {Colorful InAs Nanowire Arrays: From Strong to Weak Absorption with Geometrical Tuning.},
  url          = {http://dx.doi.org/10.1021/nl204552v},
  volume       = {12},
  year         = {2012},
}