Quantum Confinement VI: Nanostructured Materials and Devices : Proceedings of the International Symposium
"This book is a collection of some of the papers presented at the Sixth International Symposium on Quantum Confinement: Nanostructures Materials and Quantum Devices held September 5-6, 2001 in San Francisco, CA, as part of the 200th Meeting of the Electrochemical Society."
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Page 142 - The excited state is a double well with a potential barrier. The inner well (at 2.35A) is associated with the tetrahedral configuration and radiates on a long time scale of milli seconds.
Page 135 - At the threshold there is a dramatic increase in the slope of the power pumping curve from ~ 1.6 to ~ 11-12, similar to stimulated emission in inverted systems. The contrast is more dramatic in the case of CW excitation (not shown). The fluorescence is extremely weak, basically unmeasurable for low powers. However, at an average comparable to the threshold intensity in the pulsed case, the CW exhibits somewhat similar threshold behavior.
Page 142 - dielectric constant" one has to define an appropriate "cluster interior volume". For an effective interior radius ( ~ 4.2 A) we get a dielectric constant of ~ 5.7. This value is close to estimations done before by Allan at al.
Page 134 - Figure 10 shows quadratic dependence as in two-photon processes. Next we examined the dependence from aggregates of particles. Aggregates are found on the solid precursor before sonification and dispersion into individual particles. The intensity of the emission from such aggregates has a sharp threshold, with highly nonlinear emission, rising by several orders.
Page 135 - Figure 13b shows two cases when the opposite faces of a crystallite are close. The beam, in this case, strikes the opposite face forming a weaker bright spot. The blue beams are characterized by a threshold. When the incident intensity is reduced, the beam fades away, and disappear, while the interaction spot remains bright (frames in Figure 14).
Page 135 - Figure 12 gives the emission intensity from such films as a function of the average incident intensity. It is typical of the response from any part of the film. For low intensity, the emission is finite, but at an average intensity of ~ 106W/cm2 (~ 20-25 mW), the emission exhibits a sharp threshold, rising by many orders of magnitude.
Page 8 - Wingreen, in Mesoscopic Electron Transport, edited by LL Sohn, LP Kouwenhoven and G. Schon (Kluwer Dordrecht, Netherlands 1997), series E, vol.
Page 142 - ... gain. The blue emission proceeds at an interatomic distance at the top of the barrier (~3 A), where the lifetime is in the nanosecond regime and mixing between the two states is most significant. Emission from the bottom of the outer well is of longer time characteristic and of longer wavelength (in the red or near infrared). According to the Frank-Condon principle, absorption proceeds vertically up into the inner well at a bond of 2.35 A, followed by transfer into the outer by bond expansion...
Page 189 - Quantum Electronics and Graduate School of Electronics and Information Engineering, Hokkaido University...
Page 136 - SECOND HARMONIC GENERATION Bulk Si is known to have negligible nonlinearity. being zero at the second order level (not allowed because of centrosymmetry), and very small at the third-order level. We recently reported the first observation of second harmonic generation in films of ultrasmall silicon nanopartkrles.