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Pruneri, V.
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Publications (9/9 displayed)
- 2016Low temperature direct growth of graphene patterns on flexible glass substrates catalysed by a sacrificial ultrathin Ni filmcitations
- 2016Ultrafast optical response of the amorphous and crystalline states of the phase change material Ge2Sb2Te5citations
- 2010Fiber and integrated waveguide-based optical sensorscitations
- 2001Vacuum ultraviolet absorption spectrum of photorefractive Sn-doped silica fiber preformscitations
- 2001UV laser-induced current in germanosilicate fibres with built in electrodes
- 2001Thermally poled silica samples are structurally heterogeneous: Electron diffraction evidence of partial crystallizationcitations
- 2000Photoinduced processes in Sn-doped silica fiber-preformscitations
- 2000Bragg gratings in ternary SiO2 SnO2 Na2O optical glass fiberscitations
- 2000Vacuum ultra-violet absorption spectrum of photorefractive Sn-doped silica fiber preforms
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article
Ultrafast optical response of the amorphous and crystalline states of the phase change material Ge2Sb2Te5
Abstract
<p>We examine the ultrafast optical response of the crystalline and amorphous phases of the phase change material Ge2Sb2Te5 (GST) below the phase transformation threshold. Simultaneous measurement of the transmissivity and reflectivity of thin film samples yields the time-dependent evolution of the dielectric function for both phases. We then identify how lattice motion and electronic excitation manifest in the dielectric response. The dielectric response of both phases is large but markedly different. At 800 nm, the changes in amorphous GST are well described by the Drude response of the generated photocarriers, whereas the crystalline phase is better described by the depopulation of resonant bonds. We find that the generated coherent phonons have a greater influence in the amorphous phase than the crystalline phase. Furthermore, coherent phonons do not influence resonant bonding. For fluences up to 50% of the transformation threshold, the structure does not exhibit bond softening in either phase, enabling large changes of the optical properties without structural modification.</p>