Size dependence of second harmonic generation in CdSe nanocrystal quantum dots

Article Abstract:

Research describing the use of the Hyper-Rayleigh scattering method to determine the size dependence of second harmonic generation in CdSe nanocrystals is presented.

Observations, Crystals, Letter to the Editor

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Two-photon fluorescence microscopy of single semiconductor quantum rods: direct observation of highly polarized nonlinear absorption dipole

Article Abstract:

The polarization nature of single semiconductor quantum rods (QRs) under two-photon excitation allowing to directly probe the angular dependence of single chromophores is reported. The study reveals that two-photon absorbance of single QRs showed strong polarization behavior, where the nonlinear excitation is parallel to the absorption and emission transitions.

Chromophores

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Second harmonic generation and confined acoustic phonons in highly excited semiconductor nanocrystals

Article Abstract:

Time-resolved scattering and absorption measurements were used to study the photo-induced enhancement of second harmonic generation (SHG) and the effect of nanocrystal shape and pump intensity on confined acoustic phonons in semiconductor nanocrystals. Results demonstrate that when the photoexcited electron-hole density increased, the SHG signal from the nanocrystals also increased, suggesting that second-order electric susceptibility is higher for the conduction band electrons than the valence band electrons.

Optical properties, Semiconductors, Electrons, Phonons, Semiconductors (Materials), Acoustic properties, Electron scattering

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