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Picosecond dynamics of quantum structure carriers measured by time resolved photoinduced intersubband absorption |
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| Institution: | 1. Servicio de Otorrinolaringología, Hospital Universitario Marqués de Valdecilla, Santander, España;2. Medicina Preventiva y Salud Pública, Departamento de Ciencias Médicas y Quirúrgicas, Facultad de Medicina, Universidad de Cantabria;3. CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, España;4. IDIVAL, Santander, España;1. Servicio de Otorrinolaringología, Hospital Clínic Barcelona, Barcelona, España;2. Facultat de Medicina i Ciències de la Salut, Universitat de Barcelona, Barcelona, España;1. Department of Otorhinolaryngology and Head-Neck Surgery, University Medical Center Groningen, Graduate School of Medical Sciences, University of Groningen, Groningen, The Netherlands;2. Department of Otorhinolaryngology, Radboudumc, Nijmegen, The Netherlands |
| Abstract: | A novel interband-pump intersubband-probe technique is developed in order to study the dynamics of photogenerated carriers and excitons in GaAs/AlGaAs superlattices by time resolved photoinduced absorption. The photogenerated population reaches a thermal distribution a few picoseconds after the excitation. The time dependence of the intersubband absorption strength and its time resolved excitation spectra yield a measure for the time it takes for that population to cool first to the lattice temperature and then to radiatively decay. The first time is roughly 70-100 ps depending on the excess energy with which the photogenerated carriers are created. The second is on a sub-nanosecond scale and depends linearly on the lattice temperature. |
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