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Real-time observation of coherent acoustic phonons generated by an acoustically mismatched optoacoustic transducer using x-ray diffraction
Department of Physics, Lund University, Lund, Sweden.
MAX IV Laboratory, Lund University, Lund, Sweden.
MAX IV Laboratory, Lund University, Lund, Sweden.
Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS). Department of Physics, Lund University, Lund, Sweden.ORCID-id: 0000-0002-3764-4235
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2015 (Engelska)Ingår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 118, nr 18, artikel-id 185308Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The spectrum of laser-generated acoustic phonons in indium antimonide coated with a thin nickel film has been studied using time-resolved x-ray diffraction. Strain pulses that can be considered to be built up from coherent phonons were generated in the nickel film by absorption of short laser pulses. Acoustic reflections at the Ni-InSb interface leads to interference that strongly modifies the resulting phonon spectrum. The study was performed with high momentum transfer resolution together with high time resolution. This was achieved by using a third-generation synchrotron radiation source that provided a high-brightness beam and an ultrafast x-ray streak camera to obtain a temporal resolution of 10 ps. We also carried out simulations, using commercial finite element software packages and on-line dynamic diffraction tools. Using these tools, it is possible to calculate the time-resolved x-ray reflectivity from these complicated strain shapes. The acoustic pulses have a peak strain amplitude close to 1%, and we investigated the possibility to use this device as an x-ray switch. At a bright source optimized for hard x-ray generation, the low reflectivity may be an acceptable trade-off to obtain a pulse duration that is more than an order of magnitude shorter. © 2015 Author(s).

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New York: American Institute of Physics (AIP), 2015. Vol. 118, nr 18, artikel-id 185308
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URN: urn:nbn:se:hh:diva-29816DOI: 10.1063/1.4935269ISI: 000365041700042Scopus ID: 2-s2.0-84947231955OAI: oai:DiVA.org:hh-29816DiVA, id: diva2:873865
Tillgänglig från: 2015-11-25 Skapad: 2015-11-25 Senast uppdaterad: 2017-12-01Bibliografiskt granskad

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Förlagets fulltextScopushttp://scitation.aip.org/content/aip/journal/jap/118/18/10.1063/1.4935269

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Andreasson, Björn Pererik

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