Optical nonlinear absorption characteristics of crystalline Ge2Sb2Te5 thin films
作者： Shuang Liu , Jingsong Wei , Fuxi Gan
DOI: 10.1063/1.3614501
关键词: Z-scan technique 、 Two-photon absorption 、 Saturable absorption 、 Spectroscopy 、 Absorption (electromagnetic radiation) 、 Excitation 、 Extended X-ray absorption fine structure 、 Optics 、 Nonlinear optics 、 Atomic physics 、 Materials science
摘要: In this work, the optical nonlinear absorption characteristics of crystalline Ge2Sb2Te5 thin films were investigated by performing z-scan measurements with nanosecond laser pulse. The experimental results showed that saturable coefficient was as large –10−2 m/W for excitation intensity lower than 0.17 GW/m2. changed to reverse-saturable a about + 10−2 at above To explore internal mechanisms, first-principle theory employed calculate electronic structure, and five-level structure suitable explanation reversal suggested. theoretical calculation analysis indicated smaller GW/m2, contribution is mainly from band-filling effect; larger reverse thermal-induced nonlinearity, which further confirmed picosecond pulse measurement variable-temperature spectroscopy ellipsometric analysis.
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