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- W1984851837 abstract "We dispersed crystalline Si into a colloid of ultrasmall nano particles (∼1 nm), and reconstituted it into microcrystallites films on device-quality Si. The film is excited by near-infrared femtosecond two-photon process in the range 765–835 nm, with incident average power in the range 15–70 mW, focused to ∼1 μm. We have observed strong radiation at half the wavelength of the incident beam. The results are analyzed in terms of second-harmonic generation, a process that is not allowed in silicon due to the centrosymmetry. Ionic vibration of or/and excitonic self-trapping on novel radiative Si–Si dimer phase, found only in ultrasmall nanoparticles, are suggested as a basic mechanism for inducing anharmonicity that breaks the centrosymmetry." @default.
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- W1984851837 date "2000-12-18" @default.
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- W1984851837 title "Second harmonic generation in microcrystallite films of ultrasmall Si nanoparticles" @default.
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- W1984851837 doi "https://doi.org/10.1063/1.1334945" @default.
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