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Your search keyword '"Shchekin, O. B."' showing total 28 results
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28 results on '"Shchekin, O. B."'

1. Efficient electron spin detection with positively charged quantum dots

Author

Gundogdu, K., Hall, K. C., Boggess, Thomas F., Shchekin, O. B., and Deppe, D. G.

Subjects
Condensed Matter - Materials Science
Abstract

We report the application of time- and polarization-resolved photoluminescence up-conversion spectroscopy to the study of spin capture and energy relaxation in positively and negatively charged, as well as neutral, InAs self-assembled quantum dots. When compared to the neutral dots, we find that carrier capture and relaxation to the ground state is much faster in the highly charged dots, suggesting that electron-hole scattering dominates this process. The long spin lifetime, short capture time, and high radiative efficiency of the positively charged dots, indicates that these structures are superior to both quantum well and neutral quantum dot light-emitting diode (LED) spin detectors for spintronics applications.

Published
2003
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2. Vacuum Rabi splitting with a single quantum dot in a photonic crystal nanocavity

Author

Yoshie, T., Scherer, A., Hendrickson, J., Khitrova, G., Gibbs, H. M., Rupper, G., Ell, C., Shchekin, O. B., and Deppe, D. G.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): T. Yoshie [1]; A. Scherer [1]; J. Hendrickson [2]; G. Khitrova (corresponding author) [2]; H. M. Gibbs [2]; G. Rupper [2]; C. Ell [2]; O. B. Shchekin [3]; D. [...]

Published
2004
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4. Quantum dot photonic crystal nanocavities: Transition from weak to strong coupling and nonlinear emissions

Author

Hendrickson, J., Richards, B. C., Sweet, J., Christenson, C., Pajor, M., Mosor, S., Khitrova, G., Gibbs, H. M., Yoshie, T., Scherer, A., Shchekin, O. B., Deppe, D. G., Hendrickson, J., Richards, B. C., Sweet, J., Christenson, C., Pajor, M., Mosor, S., Khitrova, G., Gibbs, H. M., Yoshie, T., Scherer, A., Shchekin, O. B., and Deppe, D. G.

Abstract

Photonic crystal slab nanocavities containing one layer of quantum dots have exhibited: strong coupling to a single quantum dot; tuning by condensation of xenon gas; linewidth broadening due to ensemble dot absorption; gain and lasing.

Published
2006

5. Quantum dot photonic-crystal-slab nanocavities: Quality factors and lasing

Author

Hendrickson, J., Richards, B. C., Sweet, J., Mosor, S., Christenson, C., Lam, D., Khitrova, G., Gibbs, H. M., Yoshie, T., Scherer, A., Shchekin, O. B., Deppe, D. G., Hendrickson, J., Richards, B. C., Sweet, J., Mosor, S., Christenson, C., Lam, D., Khitrova, G., Gibbs, H. M., Yoshie, T., Scherer, A., Shchekin, O. B., and Deppe, D. G.

Abstract

Emission linewidths of quantum dot photonic-crystal-slab nanocavities are measured as a function of temperature and fabrication parameters with low-power and high-power, cw and pulsed, nonresonant excitation. The cavity linewidth is dominated by the absorption of the ensemble of quantum dots having a density of ~=400/µm2; above the absorption edge, the cavity linewidth broadens considerably compared with the empty cavity linewidth. Gain and lasing are seen for high-power pumping; it is estimated that only a small number of quantum dots contributes to the lasing.

Published
2005

6. Scanning a photonic crystal slab nanocavity by condensation of xenon

Author

Mosor, S., Hendrickson, J., Richards, B. C., Sweet, J., Khitrova, G., Gibbs, H. M., Yoshie, T., Scherer, A., Shchekin, O. B., Deppe, D. G., Mosor, S., Hendrickson, J., Richards, B. C., Sweet, J., Khitrova, G., Gibbs, H. M., Yoshie, T., Scherer, A., Shchekin, O. B., and Deppe, D. G.

Abstract

Allowing xenon or nitrogen gas to condense onto a photonic crystal slab nanocavity maintained at 10–20 K results in shifts of the nanocavity mode wavelength by as much as 5 nm (~=4 meV). This occurs in spite of the fact that the mode defect is achieved by omitting three holes to form the spacer. This technique should be useful in changing the detuning between a single quantum dot transition and the nanocavity mode for cavity quantum electrodynamics experiments, such as mapping out a strong coupling anticrossing curve. Compared with temperature scanning, it has a much larger scan range and avoids phonon broadening.

Published
2005

7. Strong-coupling and nonlinear emission from a quantum-dot photonic-crystal-slab nanocavity

Author

Hendrickson, J. R., Richards, B. C., Sweet, J., Mosor, S., Khitrova, G., Gibbs, H. M., Yoshie, T., Scherer, A., Shchekin, O. B., Deppe, D. G., Hendrickson, J. R., Richards, B. C., Sweet, J., Mosor, S., Khitrova, G., Gibbs, H. M., Yoshie, T., Scherer, A., Shchekin, O. B., and Deppe, D. G.

Abstract

An InAs quantum dot in a photonic crystal nanocavity exhibits vacuum Rabi splitting (strong coupling); a clear anti-crossing is seen between the quantum dot transition and the nanocavity mode as the temperature is scanned.

Published
2005

8. High spontaneous emission coupling factor in photonic crystal nanolasers

Author

Yoshie, T., Scherer, A., Shchekin, O. B., Chen, H., Deppe, D. G., Yoshie, T., Scherer, A., Shchekin, O. B., Chen, H., and Deppe, D. G.

Abstract

We have demonstrated high spontaneous emission coupling factor ~ 0.1 from photonic crystal nanolasers with quantum dots. This high coupling resulted from narrow homogenous broadening of the quantum dots and the small number of resonances.

Published
2004

28. 1.3 μm InAs quantum dot laser with T[sub o]=161 K from 0 to 80 °C.

Author

Shchekin, O. B. and Deppe, D. G.

Subjects
*SEMICONDUCTOR doping, *QUANTUM dots
Abstract

Data are presented on the influence of p-type modulation doping on the gain characteristics of 1.3 µm InAs quantum dot lasers. The improvement in optical gain leads to very high characteristic temperatures for the lasing threshold that reach 161 K in the temperature range between 0 and 80 °C. 1.3 µm ground state lasing is obtained up to a temperature of 167 °C. [ABSTRACT FROM AUTHOR]

Published
2002
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