Nonlinear‐transmission spectra of porous silicon: Manifestation of size quantization

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 silicon wires 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).

[1]  Needels,et al.  First-principles analysis of electronic states in silicon nanoscale quantum wires. , 1993, Physical review. B, Condensed matter.

[2]  Hongen Shen,et al.  Correlation of Raman and photoluminescence spectra of porous silicon , 1992 .

[3]  G. Qin,et al.  Mechanism of the visible luminescence in porous silicon , 1993 .

[4]  L. Canham.  Silicon quantum wire array fabrication by electrochemical and chemical dissolution of wafers , 1990 .

[5]  Philippe M. Fauchet,et al.  The effects of microcrystal size and shape on the one phonon Raman spectra of crystalline semiconductors , 1986 .

[6]  S. D. Collins,et al.  Porous silicon formation mechanisms , 1992 .

[7]  Chang,et al.  Theory of optical properties of quantum wires in porous silicon. , 1992, Physical review. B, Condensed matter.

[8]  Weber,et al.  Porous silicon and siloxene: Vibrational and structural properties. , 1993, Physical review. B, Condensed matter.

[9]  Allan,et al.  Theoretical aspects of the luminescence of porous silicon. , 1993, Physical review. B, Condensed matter.

[10]  Chang,et al.  Theory of the electronic structure of porous Si. , 1993, Physical review. B, Condensed matter.

[11]  G. Bastard,et al.  Visible photoluminescence from porous silicon: A quantum confinement effect mainly due to holes? , 1992 .

[12]  S. D. Collins,et al.  Preferential propagation of pores during the formation of porous silicon: A transmission electron microscopy study , 1989 .

[13]  Kanemitsu.  Slow decay dynamics of visible luminescence in porous silicon: Hopping of carriers confined on a shell region in nanometer-size Si crystallites. , 1993, Physical review. B, Condensed matter.

[14]  I. Sagnes,et al.  Optical absorption evidence of a quantum size effect in porous silicon , 1993 .

[15]  B. Hamilton,et al.  Evidence for quantum confinement in the photoluminescence of porous Si and SiGe , 1991 .

[16]  D. K. Okorokov,et al.  Strong optical nonlinearities and laser emission of semiconductor microcrystals , 1992 .

[17]  T. D. Harris,et al.  Luminescence and structural study of porous silicon films , 1992 .

[18]  I. Berbezier,et al.  A microstructural study of porous silicon , 1993 .

[19]  L. Ley,et al.  The one phonon Raman spectrum in microcrystalline silicon , 1981 .

[20]  Volker Lehmann,et al.  Porous silicon formation: A quantum wire effect , 1991 .

[21]  J. Pangrác,et al.  The luminescence behaviour of porous silicon layers , 1993 .