Strong optical nonlinearities in porous silicon: Femtosecond nonlinear transmission study

Victor I Klimov, D. McBranch, V. Karavanskii

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Large photoinduced absorption is observed in free-standing porous-silicon films in the spectral range from 1.1 to 2.5 eV by using a femtosecond pump-and-probe technique. The measured nonlinear transmission spectra have a very fast component with initial decay on the subpicosecond time scale. The spectral structure and temporal behavior of induced absorption show the presence of molecularlike Si complexes with well-defined energy levels and spectrally uniform picosecond relaxation dynamics.

Original languageEnglish
JournalPhysical Review B
Issue number24
Publication statusPublished - 1995


ASJC Scopus subject areas

  • Condensed Matter Physics

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