Photo-acoustic spectroscopy revealing resonant absorption of self-assembled GaAs-based nanowires

Grigore Leahu; Emilija Petronijevic; Alessandro Belardini; Marco Centini; Roberto Li Voti; Teemu Hakkarainen; Eero Koivusalo; Mircea Guina; Concita Sibilia

doi:10.1038/s41598-017-02839-1

Photo-acoustic spectroscopy revealing resonant absorption of self-assembled GaAs-based nanowires

Grigore Leahu, Emilija Petronijevic, Alessandro Belardini, Marco Centini, Roberto Li Voti, Teemu Hakkarainen, Eero Koivusalo, Mircea Guina, Concita Sibilia

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Abstract

III–V semiconductors nanowires (NW) have recently attracted a significant interest for their potential application in the development of high efficiency, highly-integrated photonic devices and in particular for the possibility to integrate direct bandgap materials with silicon-based devices. Here we report the absorbance properties of GaAs-AlGaAs-GaAs core-shell-supershell NWs using photo-acoustic spectroscopy (PAS) measurements in the spectral range from 300 nm to 1100 nm wavelengths. The NWs were fabricated by self-catalyzed growth on Si substrates and their dimensions (length ~5 μm, diameter ~140–150 nm) allow for the coupling of the incident light to the guided modes in near-infrared (IR) part of the spectrum. This coupling results in resonant absorption peaks in the visible and near IR clearly evidenced by PAS. The analysis reveal broadening of the resonant absorption peaks arising from the NW size distribution and the interaction with other NWs. The results show that the PAS technique, directly providing scattering independent absorption spectra, is a very useful tool for the characterization and investigation of vertical NWs as well as for the design of NW ensembles for photonic applications, such as Si-integrated light sources, solar cells, and wavelength dependent photodetectors.

Original language	English
Article number	2833
Number of pages	9
Journal	Scientific Reports
Volume	7
DOIs	https://doi.org/10.1038/s41598-017-02839-1
Publication status	Published - 6 Jun 2017
Publication type	A1 Journal article-refereed

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title = "Photo-acoustic spectroscopy revealing resonant absorption of self-assembled GaAs-based nanowires",

abstract = "III–V semiconductors nanowires (NW) have recently attracted a significant interest for their potential application in the development of high efficiency, highly-integrated photonic devices and in particular for the possibility to integrate direct bandgap materials with silicon-based devices. Here we report the absorbance properties of GaAs-AlGaAs-GaAs core-shell-supershell NWs using photo-acoustic spectroscopy (PAS) measurements in the spectral range from 300 nm to 1100 nm wavelengths. The NWs were fabricated by self-catalyzed growth on Si substrates and their dimensions (length ~5 μm, diameter ~140–150 nm) allow for the coupling of the incident light to the guided modes in near-infrared (IR) part of the spectrum. This coupling results in resonant absorption peaks in the visible and near IR clearly evidenced by PAS. The analysis reveal broadening of the resonant absorption peaks arising from the NW size distribution and the interaction with other NWs. The results show that the PAS technique, directly providing scattering independent absorption spectra, is a very useful tool for the characterization and investigation of vertical NWs as well as for the design of NW ensembles for photonic applications, such as Si-integrated light sources, solar cells, and wavelength dependent photodetectors.",

author = "Grigore Leahu and Emilija Petronijevic and Alessandro Belardini and Marco Centini and {Li Voti}, Roberto and Teemu Hakkarainen and Eero Koivusalo and Mircea Guina and Concita Sibilia",

year = "2017",

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doi = "10.1038/s41598-017-02839-1",

language = "English",

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journal = "Scientific Reports",

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T1 - Photo-acoustic spectroscopy revealing resonant absorption of self-assembled GaAs-based nanowires

AU - Leahu, Grigore

AU - Petronijevic, Emilija

AU - Belardini, Alessandro

AU - Centini, Marco

AU - Li Voti, Roberto

AU - Hakkarainen, Teemu

AU - Koivusalo, Eero

AU - Guina, Mircea

AU - Sibilia, Concita

PY - 2017/6/6

Y1 - 2017/6/6

N2 - III–V semiconductors nanowires (NW) have recently attracted a significant interest for their potential application in the development of high efficiency, highly-integrated photonic devices and in particular for the possibility to integrate direct bandgap materials with silicon-based devices. Here we report the absorbance properties of GaAs-AlGaAs-GaAs core-shell-supershell NWs using photo-acoustic spectroscopy (PAS) measurements in the spectral range from 300 nm to 1100 nm wavelengths. The NWs were fabricated by self-catalyzed growth on Si substrates and their dimensions (length ~5 μm, diameter ~140–150 nm) allow for the coupling of the incident light to the guided modes in near-infrared (IR) part of the spectrum. This coupling results in resonant absorption peaks in the visible and near IR clearly evidenced by PAS. The analysis reveal broadening of the resonant absorption peaks arising from the NW size distribution and the interaction with other NWs. The results show that the PAS technique, directly providing scattering independent absorption spectra, is a very useful tool for the characterization and investigation of vertical NWs as well as for the design of NW ensembles for photonic applications, such as Si-integrated light sources, solar cells, and wavelength dependent photodetectors.

AB - III–V semiconductors nanowires (NW) have recently attracted a significant interest for their potential application in the development of high efficiency, highly-integrated photonic devices and in particular for the possibility to integrate direct bandgap materials with silicon-based devices. Here we report the absorbance properties of GaAs-AlGaAs-GaAs core-shell-supershell NWs using photo-acoustic spectroscopy (PAS) measurements in the spectral range from 300 nm to 1100 nm wavelengths. The NWs were fabricated by self-catalyzed growth on Si substrates and their dimensions (length ~5 μm, diameter ~140–150 nm) allow for the coupling of the incident light to the guided modes in near-infrared (IR) part of the spectrum. This coupling results in resonant absorption peaks in the visible and near IR clearly evidenced by PAS. The analysis reveal broadening of the resonant absorption peaks arising from the NW size distribution and the interaction with other NWs. The results show that the PAS technique, directly providing scattering independent absorption spectra, is a very useful tool for the characterization and investigation of vertical NWs as well as for the design of NW ensembles for photonic applications, such as Si-integrated light sources, solar cells, and wavelength dependent photodetectors.

U2 - 10.1038/s41598-017-02839-1

DO - 10.1038/s41598-017-02839-1

M3 - Article

SN - 2045-2322

VL - 7

JO - Scientific Reports

JF - Scientific Reports

M1 - 2833

ER -

Photo-acoustic spectroscopy revealing resonant absorption of self-assembled GaAs-based nanowires

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