Narrow-band spectral hole burning in quantum dots

Гапоненко, С. В.; Woggon, U.; Uhrig, A.; Langbein, Wolfgang Werner; Klingshirn, C.

doi:10.1016/0022-2313(94)90151-1

Cited by 15 publications

(8 citation statements)

References 28 publications

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“…In PL spectra of nanoparticles A II B VI compound sharp lines were observed [1]. While the homogeneous width of electronic transition obtained from hole-burning experiments [2] and size-selective photoetching [3] is much wider [3]. We attribute this difference in half-width of lines and Stokes shift to relaxation processes of electronic excitation in nanoparticles.…”

Section: Introductionmentioning

confidence: 76%

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Hot luminescence of CdSe nanoparticles at low temperature

Galak

Dmitruk

2005

Journal of Luminescence

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Section: Introductionmentioning

confidence: 76%

“…Solving corresponding Schro¨dinger equation we have energy spectra of confined electron and hole for various values of orbital moment l=0,1,2 and principal quantum number (n=1,2,3,y) that corresponds to bound states. The homogeneous broadening of energy levels, given by hole-burning experiments, is 50 meV (FWHM) [2].…”

Section: Resultsmentioning

confidence: 99%

Hot luminescence of CdSe nanoparticles at low temperature

Galak

Dmitruk

2005

Journal of Luminescence

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“…This trend is identical to what was previously reported in the case of CdSe NDs. 5,13,14 The temperature dependence of the PL peak energy is presented in Fig. 2 for the three shapes.…”

Section: Temperature Effects On the Spectral Properties Of Colloidal mentioning

confidence: 99%

Temperature effects on the spectral properties of colloidal CdSe nanodots, nanorods, and tetrapods

Salman

Tortschanoff

Mohamed

et al. 2007

Applied Physics Letters

154

157

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The temperature dependence of the absorption and fluorescence spectra of colloidal CdSe nanocrystals was compared for three different shapes (dots, rods, and tetrapods) in the range of 4–300K. While the shift of the fluorescence maximum indicates little dependence on the shape, the authors find that the broadening of the emission spectrum behaves very differently for dots and rods, indicating major differences in the broadening mechanisms for different shapes. Tetrapods behave more similarly to dots, which suggests that the lowest exciton state is centered at the core.

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“…A comprehensive knowledge about nonlinear absorption and refraction processes in quasi-zero dimensional semiconductor structures or QDs is important for further development of nonlinear-optical semiconductor devices [1][2][3][4]. Quest for knowledge about this topic can be adequately addressed by nonlinear optical experimental techniques, such as Z-scan [5][6][7][8], degenerate four-wave mixing (DFWM) [9,10], and pump-probe spectroscopy [11]. Over the past years, these nonlinear optical experimental techniques have been extensively used as powerful tools towards investigating the excited electron-hole pair states dynamics of semiconductor QDs, providing complementary information that obtained by linear optical experimental techniques.…”

Section: Introductionmentioning

confidence: 99%

Observation of four-photon absorption and determination of corresponding nonlinearities in CdS quantum dots

Ghosh,

Ramya,

Mohapatra

et al. 2016

Preprint

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Bound-and excited-state electronic nonlinearities in CdS quantum dots have been investigated by Degenerate Four-Wave Mixing (DFWM) and Z-scan techniques in the femtosecond time regime. This QD sample shows Kerr-type nonlinearity for incident beam intensity below 0.18 TW/cm 2 . However, further increment in intensity results in four-photon absorption (4PA) indicated by openand closed-aperture Z-scan experiments. Comparing open-aperture Z-scan experimental results with theoretical models, the 4PA coefficient α 4 has been deduced. Furthermore, third-order nonlinear index γ and refractive-index change coefficient σ r corresponding to excited-state electrons due to 4PA have been calculated from the closed-aperture Z-scan results. UV-visible absorption and photoluminescence experimental results are analyzed towards estimating band gap energy and defect state energy. Time Correlated Single Photon Counting (TCSPC) was employed to determine the decay time corresponding to band-edge and defect states. The linear and nonlinear optical techniques have allowed the direct observation of lower and higher-order electronic states in CdS quantum dots.

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Narrow-band spectral hole burning in quantum dots

Cited by 15 publications

References 28 publications

Hot luminescence of CdSe nanoparticles at low temperature

Hot luminescence of CdSe nanoparticles at low temperature

Temperature effects on the spectral properties of colloidal CdSe nanodots, nanorods, and tetrapods

Observation of four-photon absorption and determination of corresponding nonlinearities in CdS quantum dots

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