Enhancement of ultrafast nonlinear optical response of silicon nanocrystals by boron-doping

Nonlinear optical responses of boron (B)-doped silicon nanocrystals (Si-ncs) embedded in borosilicate glass were studied by z-scan and optical Kerr gate methods under femtosecond excitation at 780 nm. The nonlinear refractive index (n(2)) and the two photon absorption coefficients (β) of B-doped Si-...

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Bibliographic Details
Published inOptics letters Vol. 37; no. 11; p. 1877
Main Authors Imakita, Kenji, Ito, Masahiko, Naruiwa, Ryo, Fujii, Minoru, Hayashi, Shinji
Format Journal Article
LanguageEnglish
Published United States 01.06.2012
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Summary:Nonlinear optical responses of boron (B)-doped silicon nanocrystals (Si-ncs) embedded in borosilicate glass were studied by z-scan and optical Kerr gate methods under femtosecond excitation at 780 nm. The nonlinear refractive index (n(2)) and the two photon absorption coefficients (β) of B-doped Si-ncs were found to be 3 times enhanced, compared to those of intrinsic Si-ncs. The response time was faster than 100 fs even at 5 K. The origin of the large nonlinear optical response was discussed, based on the experimental data of n(2), electron spin resonance spectra, and linear absorption spectra.
ISSN:1539-4794
DOI:10.1364/ol.37.001877