Nonlinear-transmission spectra of porous silicon: Manifestation of size quantizationстатья
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Дата последнего поиска статьи во внешних источниках: 23 января 2016 г.
Аннотация:Changes in the transmission of porous silicon layers induced by ultrashort laser pulses are studied by using picosecond pump and probe measurements. Bleaching bands attributed to the saturation of optical transitions in siliconwires or/and crystallites with nanometer dimensions are observed in time‐resolved differential transmission spectra. The measured nonlinearity is characterized by a relatively high value of the third‐order nonlinear susceptibility (≊10−8 esu) and by fast relaxation dynamics (transmission recovery time is 30–40 ps).