Size effect in the optical second harmonic generation by silicon nanoparticles |
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| Authors: | O A Aktsipetrov V O Bessonov A A Nikulin Q Gong X Huang and K Chen |
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| Institution: | 1.Faculty of Physics,Moscow State University,Moscow,Russia;2.State Key Laboratory for Artificial Microstructures and Mesoscopic Physics,Peking University,Beijing,China |
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| Abstract: | A size effect has been revealed in the spectra of the second harmonic generated in a reflection from an amorphous silicon
composite layer with inclusions of crystalline silicon (nanocrystallites) measured at room temperature: a decrease in the
mean size of the nanocrystallites from 100 to 30 nm is accompanied by a shift of the spectral peak near 3.3 eV by 0.12 eV
towards the short wavelengths and an increase in the peak width by a factor of 1.5. As a possible mechanism of this phenomenon,
the effect of the structural defects on the parameters of the optical transitions in the nanocrystallites is discussed. |
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