We present a novel contactless technique for thermal conductivity determination and thermal field mapping based on creating a thermal distribution of phonons using a heating laser, while a second laser probes the local temperature through the spectral position of a Raman active mode. The spatial resolution can be as small as 300 nm, whereas its temperature accuracy is ±2 K. We validate this technique investigating the thermal properties of three free-standing single crystalline Si membranes with thickness of 250, 1000, and 2000 nm. We show that for two-dimensional materials such as free-standing membranes or thin films, and for small temperature gradients, the thermal field decays as T(r) ∝ ln(r) in the diffusive limit. The case of large temperature gradients within the membranes leads to an exponential decay of the thermal field, T ∝ exp[ − A·ln(r)]. The results demonstrate the full potential of this new contactless method for quantitative determination of thermal properties. The range of materials to which this method is applicable reaches far beyond the here demonstrated case of Si, as the only requirement is the presence of a Raman active mode.
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March 2014
Research Article|
March 10 2014
A novel contactless technique for thermal field mapping and thermal conductivity determination: Two-Laser Raman Thermometry
J. S. Reparaz;
J. S. Reparaz
1
ICN2 - Institut Catala de Nanociencia i Nanotecnologia
, Campus UAB, 08193 Bellaterra, Barcelona, Spain
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E. Chavez-Angel;
E. Chavez-Angel
1
ICN2 - Institut Catala de Nanociencia i Nanotecnologia
, Campus UAB, 08193 Bellaterra, Barcelona, Spain
2Department of Physics,
UAB
, 08193 Bellaterra, Barcelona, Spain
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M. R. Wagner;
M. R. Wagner
1
ICN2 - Institut Catala de Nanociencia i Nanotecnologia
, Campus UAB, 08193 Bellaterra, Barcelona, Spain
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B. Graczykowski;
B. Graczykowski
1
ICN2 - Institut Catala de Nanociencia i Nanotecnologia
, Campus UAB, 08193 Bellaterra, Barcelona, Spain
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J. Gomis-Bresco;
J. Gomis-Bresco
1
ICN2 - Institut Catala de Nanociencia i Nanotecnologia
, Campus UAB, 08193 Bellaterra, Barcelona, Spain
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F. Alzina;
F. Alzina
1
ICN2 - Institut Catala de Nanociencia i Nanotecnologia
, Campus UAB, 08193 Bellaterra, Barcelona, Spain
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C. M. Sotomayor Torres
C. M. Sotomayor Torres
1
ICN2 - Institut Catala de Nanociencia i Nanotecnologia
, Campus UAB, 08193 Bellaterra, Barcelona, Spain
3
ICREA
, Passeig Lluís Companys 23, 08010 Barcelona, Spain
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Rev. Sci. Instrum. 85, 034901 (2014)
Article history
Received:
December 28 2013
Accepted:
February 16 2014
Citation
J. S. Reparaz, E. Chavez-Angel, M. R. Wagner, B. Graczykowski, J. Gomis-Bresco, F. Alzina, C. M. Sotomayor Torres; A novel contactless technique for thermal field mapping and thermal conductivity determination: Two-Laser Raman Thermometry. Rev. Sci. Instrum. 1 March 2014; 85 (3): 034901. https://doi.org/10.1063/1.4867166
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