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Optical response of wurtzite and zinc blende GaP nanowire arrays

Aghaeipour, Mahtab LU ; Anttu, Nicklas LU ; Nylund, Gustav LU ; Berg, Alexander LU ; Lehmann, Sebastian LU and Pistol, Mats-Erik LU (2015) In Optics Express 23(23). p.30177-30187
Abstract
We compare the optical response of wurtzite and zinc blende GaP nanowire arrays for varying geometry of the nanowires. We measure reflectance spectra of the arrays and extract from these measurements the absorption in the nanowires. To support our experimental findings and to allow for more detailed investigations of the optical response of the nanowire arrays than possible in experiments, we perform electromagnetic modeling. This modeling highlights the validity of the extraction of the absorptance from reflectance spectra, as well as limitations of the extraction due to anti-reflection properties of the nanowires. In our combined experimental and theoretical study, we find for both zinc blende and wurtzite nanowires an absorption... (More)
We compare the optical response of wurtzite and zinc blende GaP nanowire arrays for varying geometry of the nanowires. We measure reflectance spectra of the arrays and extract from these measurements the absorption in the nanowires. To support our experimental findings and to allow for more detailed investigations of the optical response of the nanowire arrays than possible in experiments, we perform electromagnetic modeling. This modeling highlights the validity of the extraction of the absorptance from reflectance spectra, as well as limitations of the extraction due to anti-reflection properties of the nanowires. In our combined experimental and theoretical study, we find for both zinc blende and wurtzite nanowires an absorption resonance that can be tuned into the ultraviolet by decreasing the diameter of the nanowires. This peak stops blue-shifting with decreasing nanowire diameter at a wavelength of approximately 330 nm for zinc blende GaP. In contrast, for the wurtzite GaP nanowires, the resonance continues blue-shifting at 310 nm for the smallest diameters we succeeded in fabricating. We interpret this as a difference in refractive index between wurtzite and zinc blende GaP in this wavelength region. These results open up for optical applications through resonant absorption in the visible and ultraviolet wavelength regions with both zinc blende and wurtzite GaP nanowire arrays. Notably, zinc blende and wurtzite GaP support resonant absorption deeper into the ultraviolet region than previously found for zinc blende and wurtzite InP and InAs. (C) 2015 Optical Society of America (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Express
volume
23
issue
23
pages
30177 - 30187
publisher
OSA
external identifiers
  • wos:000366611500084
  • scopus:84957002074
ISSN
1094-4087
DOI
10.1364/OE.23.030177
language
English
LU publication?
yes
id
57630ad7-fbd8-449f-8885-e25358bee5b8 (old id 8556606)
date added to LUP
2016-01-28 09:37:24
date last changed
2017-11-12 03:37:49
@article{57630ad7-fbd8-449f-8885-e25358bee5b8,
  abstract     = {We compare the optical response of wurtzite and zinc blende GaP nanowire arrays for varying geometry of the nanowires. We measure reflectance spectra of the arrays and extract from these measurements the absorption in the nanowires. To support our experimental findings and to allow for more detailed investigations of the optical response of the nanowire arrays than possible in experiments, we perform electromagnetic modeling. This modeling highlights the validity of the extraction of the absorptance from reflectance spectra, as well as limitations of the extraction due to anti-reflection properties of the nanowires. In our combined experimental and theoretical study, we find for both zinc blende and wurtzite nanowires an absorption resonance that can be tuned into the ultraviolet by decreasing the diameter of the nanowires. This peak stops blue-shifting with decreasing nanowire diameter at a wavelength of approximately 330 nm for zinc blende GaP. In contrast, for the wurtzite GaP nanowires, the resonance continues blue-shifting at 310 nm for the smallest diameters we succeeded in fabricating. We interpret this as a difference in refractive index between wurtzite and zinc blende GaP in this wavelength region. These results open up for optical applications through resonant absorption in the visible and ultraviolet wavelength regions with both zinc blende and wurtzite GaP nanowire arrays. Notably, zinc blende and wurtzite GaP support resonant absorption deeper into the ultraviolet region than previously found for zinc blende and wurtzite InP and InAs. (C) 2015 Optical Society of America},
  author       = {Aghaeipour, Mahtab and Anttu, Nicklas and Nylund, Gustav and Berg, Alexander and Lehmann, Sebastian and Pistol, Mats-Erik},
  issn         = {1094-4087},
  language     = {eng},
  number       = {23},
  pages        = {30177--30187},
  publisher    = {OSA},
  series       = {Optics Express},
  title        = {Optical response of wurtzite and zinc blende GaP nanowire arrays},
  url          = {http://dx.doi.org/10.1364/OE.23.030177},
  volume       = {23},
  year         = {2015},
}