High resolution spectroscopy of self-assembled single GaAs/AlGaAs quantum dots

2009 ◽  
Vol 6 (4) ◽  
pp. 890-893 ◽  
Author(s):  
M. Abbarchi ◽  
C. Mastrandrea ◽  
T. Kuroda ◽  
A. Vinattieri ◽  
T. Mano ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Resolution ◽  
High Resolution Spectroscopy ◽  
Self Assembled

Resonant two-color high-resolution spectroscopy of a negatively charged exciton in a self-assembled quantum dot

2008 ◽  
Vol 78 (7) ◽  
Author(s):  
M. Kroner ◽  
K. M. Weiss ◽  
B. Biedermann ◽  
S. Seidl ◽  
A. W. Holleitner ◽  
...  
Keyword(s):  
High Resolution ◽  
Quantum Dot ◽  
High Resolution Spectroscopy ◽  
Charged Exciton ◽  
Self Assembled

High-Resolution Spectroscopic Measurements of InGaAs/GaAs Self-Assembled Quantum Dots

2019 ◽  
Vol 2 (5) ◽  
pp. 15-25 ◽  
Author(s):  
Kevin L. Silverman ◽  
Joseph Berry ◽  
Martin Stevens ◽  
Richard Mirin
Keyword(s):  
Quantum Dots ◽  
High Resolution ◽  
Spectroscopic Measurements ◽  
Self Assembled

Lateral and vertical ordering of self-assembled PbSe quantum dots studied by high-resolution X-ray diffraction

2000 ◽  
Vol 283 (1-3) ◽  
pp. 65-68 ◽  
Author(s):  
V. Holý ◽  
J. Stangl ◽  
G. Springholz ◽  
M. Pinczolits ◽  
G. Bauer ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Resolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Self Assembled

Effects of Rapid Thermal Annealing on the Intersubband Energy Spacing of Self-Assembled InAs/Gaas Quantum Dots

1999 ◽  
Vol 588 ◽  
Author(s):  
X. C. Wang ◽  
S. J. Chua ◽  
S. J. Xu ◽  
Z. H. Zhang
Keyword(s):  
Quantum Dots ◽  
Excited State ◽  
High Resolution ◽  
Thermal Treatment ◽  
Ground State ◽  
Infrared Detectors ◽  
Blue Shift ◽  
X Ray Diffraction ◽  
X Ray ◽  
Self Assembled

AbstractIn this paper, we showed the significant reduction of the energy spacing between ground state and excited state emissions from InAs/GaAs quantum dots due to interface interdiffusion induced by thermal treatment. In addition, the strong narrowing of the luminescence linewidth of the ground state and excited state emissions from the InAs dot layers for the annealed samples indicates an improvement of the size-distribution of the QDs. Large blue-shift of the energy positions of both emissions was also observed. High resolution X-Ray diffraction experiments give strong evidence of the interface atom interdiffusion in the annealed samples. This work shows ability to tune the wavelength for applications like infrared detectors and lasers based on intrasubband transitions of self-assembled QDs.

Microcalorimeters for X-Ray Spectroscopy

1988 ◽  
Vol 102 ◽  
pp. 41
Author(s):  
E. Silver ◽  
C. Hailey ◽  
S. Labov ◽  
N. Madden ◽  
D. Landis ◽  
...  
Keyword(s):  
High Resolution ◽  
High Efficiency ◽  
Thermal Response ◽  
Low Noise ◽  
High Resolution Spectroscopy ◽  
Superconducting Transition ◽  
Sapphire Substrates ◽  
Laboratory Plasmas ◽  
Adiabatic Demagnetization ◽  
Theoretical Predictions

The merits of microcalorimetry below 1°K for high resolution spectroscopy has become widely recognized on theoretical grounds. By combining the high efficiency, broadband spectral sensitivity of traditional photoelectric detectors with the high resolution capabilities characteristic of dispersive spectrometers, the microcalorimeter could potentially revolutionize spectroscopic measurements of astrophysical and laboratory plasmas. In actuality, however, the performance of prototype instruments has fallen short of theoretical predictions and practical detectors are still unavailable for use as laboratory and space-based instruments. These issues are currently being addressed by the new collaborative initiative between LLNL, LBL, U.C.I., U.C.B., and U.C.D.. Microcalorimeters of various types are being developed and tested at temperatures of 1.4, 0.3, and 0.1°K. These include monolithic devices made from NTD Germanium and composite configurations using sapphire substrates with temperature sensors fabricated from NTD Germanium, evaporative films of Germanium-Gold alloy, or material with superconducting transition edges. A new approache to low noise pulse counting electronics has been developed that allows the ultimate speed of the device to be determined solely by the detector thermal response and geometry. Our laboratory studies of the thermal and resistive properties of these and other candidate materials should enable us to characterize the pulse shape and subsequently predict the ultimate performance. We are building a compact adiabatic demagnetization refrigerator for conveniently reaching 0.1°K in the laboratory and for use in future satellite-borne missions. A description of this instrument together with results from our most recent experiments will be presented.

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