Thermal conductivity of GaAs nanowires studied by micro-Raman spectroscopy combined with laser heating

Martin Soini; Ilaria Zardo; Emanuele Uccelli; Stefan Funk; Gregor Koblmüller; Anna Fontcuberta I Morral; Gerhard Abstreiter

doi:10.1063/1.3532848

Thermal conductivity of GaAs nanowires studied by micro-Raman spectroscopy combined with laser heating

Martin Soini, Ilaria Zardo, Emanuele Uccelli, Stefan Funk, Gregor Koblmüller, Anna Fontcuberta I Morral, Gerhard Abstreiter

Natural Sciences

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101 Scopus citations

Abstract

The thermal properties of freely suspended GaAs nanowires are investigated by applying a method which relies on laser heating and the determination of the local temperature by Raman spectroscopy. In order to determine the values for the thermal conductivity κ, the fraction of the laser power absorbed inside the GaAs nanowire is estimated by numerical simulations. The thermal conductivity of nanowires with homogeneous diameter is found to lie in the range of 8-36 W m-1 K-1. The change of the temperature profile in the presence of a tapering was investigated. Furthermore, we discuss the influence of laser heating in ambient conditions on the value of κ.

Original language	English
Article number	263107
Journal	Applied Physics Letters
Volume	97
Issue number	26
DOIs	https://doi.org/10.1063/1.3532848
State	Published - 27 Dec 2010

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abstract = "The thermal properties of freely suspended GaAs nanowires are investigated by applying a method which relies on laser heating and the determination of the local temperature by Raman spectroscopy. In order to determine the values for the thermal conductivity κ, the fraction of the laser power absorbed inside the GaAs nanowire is estimated by numerical simulations. The thermal conductivity of nanowires with homogeneous diameter is found to lie in the range of 8-36 W m-1 K-1. The change of the temperature profile in the presence of a tapering was investigated. Furthermore, we discuss the influence of laser heating in ambient conditions on the value of κ.",

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AU - Koblmüller, Gregor

AU - Fontcuberta I Morral, Anna

AU - Abstreiter, Gerhard

PY - 2010/12/27

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AB - The thermal properties of freely suspended GaAs nanowires are investigated by applying a method which relies on laser heating and the determination of the local temperature by Raman spectroscopy. In order to determine the values for the thermal conductivity κ, the fraction of the laser power absorbed inside the GaAs nanowire is estimated by numerical simulations. The thermal conductivity of nanowires with homogeneous diameter is found to lie in the range of 8-36 W m-1 K-1. The change of the temperature profile in the presence of a tapering was investigated. Furthermore, we discuss the influence of laser heating in ambient conditions on the value of κ.

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Thermal conductivity of GaAs nanowires studied by micro-Raman spectroscopy combined with laser heating

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