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Ultrafast insulator-to-metal phase transition as a switch to measure the spectrogram of a supercontinuum light pulse

Source: Appl. Phys. Lett. 96, 021102 (2010); doi:10.1063/1.3291105

Published 11 January 2010

KEYWORDS and PACS
Keywords
PACS
  • 71.30.+h
    Metal-insulator transitions and other electronic transitions
  • 81.30.Hd
    Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
  • 78.66.-w
    Optical properties of specific thin films
  • 78.47.J-
    Ultrafast pump/probe spectroscopy (<1 ps) in condensed matter
  • 78.67.Pt
    Optical properties of multilayers and superlattices
  • YEAR: 2010
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PUBLICATION DATA
ISSN:
1553-9601 (online)
Publisher:
AIP is a member of CrossRef AIP
Federico Cilento,1,2 Claudio Giannetti,3 Gabriele Ferrini,3 Stefano Dal Conte,4 Tommaso Sala,3 Giacomo Coslovich,1,2 Matteo Rini,5 Andrea Cavalleri,6,7 and Fulvio Parmigiani1,8
1Department of Physics, Università degli Studi di Trieste, Trieste I-34127, Italy
2Laboratorio Nazionale TASC, AREA Science Park, Basovizza Trieste I-34012, Italy
3Department of Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
4Department of Physics A. Volta, Università degli Studi di Pavia, Pavia I-27100, , Italy
5Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
6Condensed Matter Division, Max Planck Research Department for Structural Dynamics, University of Hamburg, 22607 Hamburg, Germany
7Department of Physics, Clarendon Laboratory, University of Oxford, OX1 3PU Oxford, United Kingdom
8Sincrotrone Trieste S.C.p.A., Basovizza, Trieste I-34012, Italy
In this letter we demonstrate the possibility to determine the temporal and spectral structure (spectrogram) of a complex light pulse exploiting the ultrafast switching character of a nonthermal photoinduced phase transition. As a proof, we use a VO2 multifilm, undergoing an ultrafast insulator-to-metal phase transition when excited by femtosecond near-infrared laser pulses. The abrupt variation in the multifilm optical properties, over a broad infrared/visible frequency range, is exploited to determine, in situ and in a simple way, the spectrogram of a supercontinuum pulse produced by a photonic crystal fiber. The determination of the structure of the pulse is mandatory to develop pump-probe experiments with frequency resolution over a broad spectral range (700–1100 nm). ©2010 American Institute of Physics
History: Received 20 October 2009; accepted 10 December 2009; published 11 January 2010
Permalink: http://link.aip.org/link/?APPLAB/96/021102/1

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