LIGHT EMISSION, ABSORPTION AND AMPLIFICATION IN InAs/GaAs QUANTUM DOTS AND GaAs/AlGaAs QUANTUM WELLS RESULTING FROM OPTICAL PUMPING

2007 ◽  
Vol 06 (03n04) ◽  
pp. 241-244 ◽  
Author(s):  
D. A. FIRSOV ◽  
L. E. VOROBJEV ◽  
M. A. BARZILOVICH ◽  
V. YU. PANEVIN ◽  
I. V. MIKHAYLOV ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Wells ◽  
Light Absorption ◽  
Optical Pumping ◽  
Light Emission ◽  
Optical Excitation ◽  
Ground Level ◽  
Infrared Light ◽  
Mid Infrared ◽  
Gaas Quantum Dot

Optical phenomena in quantum dot and quantum well nanostructures aimed at the development of mid-infrared lasers based on intraband electron transitions are investigated in the conditions of interband optical pumping. Evolution of photoluminescence spectra and interband light absorption with intensity of interband optical excitation is investigated in InAs / GaAs quantum dot structures. Optically induced intersubband mid-infrared light absorption is studied in undoped tunnel-coupled GaAs / AlGaAs quantum wells. The stabilization of the electron concentration at the ground level of tunnel-coupled quantum wells under increasing pumping level is established.

Non-resonant optical excitation of mode-locked electron spin coherence in (In,Ga)As/GaAs quantum dot ensemble

2012 ◽  
Vol 100 (23) ◽  
pp. 232107 ◽  
Author(s):  
A. Schwan ◽  
S. Varwig ◽  
A. Greilich ◽  
D. R. Yakovlev ◽  
D. Reuter ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Electron Spin ◽  
Optical Excitation ◽  
Spin Coherence ◽  
Gaas Quantum Dot

Optical Nmr From Single Quantum Dots

1996 ◽  
Vol 442 ◽  
Author(s):  
S. W. Brown ◽  
T. A. Kennedy ◽  
D. Gammon
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Quantum Wells ◽  
Optical Pumping ◽  
Nuclear Orientation ◽  
Energy Levels ◽  
Zeeman Splitting ◽  
Single Quantum ◽  
Interface Fluctuations ◽  
20 Nm

AbstractWe have observed nuclear magnetic resonance (NMR) signatures from constituent Ga and As nuclei in single GaAs quantum dots formed by interface fluctuations in GaAs/AlGaAs quantum wells. Orientation of the nuclear spin system by optical pumping causes an Overhauser shift in the excitonic energy levels proportional to the degree of nuclear orientation. NMR was detected by monitoring changes in the combined Overhauser plus Zeeman splitting of an exciton localized in a single quantum dot as the RF frequency was swept through a nuclear resonance. The NMR signals originate from ∼105 nuclei in the quantum dot — (20 nm)3 volume - representing an increase in sensitivity of five orders of magnitude over previous optical NMR measurements and thirteen orders of magnitude over conventional NMR. The data were fit to Lorentzian lineshapes, giving 75As linewidths on the order of 20 kHz.

scholarly journals Mid-infrared light absorption by photo-excited charge carriers in Ge/Si quantum dots

2015 ◽  
Vol 586 ◽  
pp. 012001
Author(s):  
L E Vorobjev ◽  
D A Firsov ◽  
V Yu Panevin ◽  
A N Sofronov ◽  
R M Balagula ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Absorption ◽  
Charge Carriers ◽  
Infrared Light ◽  
Mid Infrared ◽  
Si Quantum Dots

Spontaneous and Stimulated Intersubband Emission Under Optical Pumping

1996 ◽  
Vol 450 ◽  
Author(s):  
P. Boucaud ◽  
S. Sauvage ◽  
O. Gauthier-Lafaye ◽  
Z. Moussa ◽  
F.-H. Julien ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Free Electron Laser ◽  
Population Inversion ◽  
Laser Emission ◽  
Optical Pumping ◽  
Stimulated Emission ◽  
Mid Infrared ◽  
Asymmetric Quantum ◽  
Waveguide Length ◽  
Subband Energy

ABSTRACTWe have investigated the mid-infrared spontaneous and stimulated emission between confined subbands in the conduction band of GaAs/AlGaAs quantum wells. The carriers which give rise to the intersubband emission are excited in the upper subbands using an intersubband optical pumping in coupled asymmetric quantum wells. The quantum wells are designed using phonon engineering in order to obtain population inversion between the second and first excited subband. This is obtained by adjusting the subband energy spacing between E2 and E1 close to the optical phonon energy which in turn allows an efficient relaxation. We have first observed intersubband spontaneous emission between E3 and E2 at 14 μm using an intersubband pumping with a CO2 laser in resonance with the E1-E3 transition. In a second set of experiments, the quantum wells are embedded in an infrared waveguide. We have measured the stimulated intersubband gain using a picosecond two-color free electron laser. The first color bleaches the E1-E3 transition and provides the population inversion. The intersubband stimulated gain is measured versus the waveguide length and photon energy. Stimulated gains ≈ 80 cm−1 are reported thus demonstrating that laser emission under optical pumping appears feasible in optimized structures. Finally, we show that intersubband emission can also be observed in quantum wells using an interband optical pumping.

scholarly journals Monolithically Integrated InAs/GaAs Quantum Dot Mid-Infrared Photodetectors on Silicon Substrates

ACS Photonics ◽  
2016 ◽  
Vol 3 (5) ◽  
pp. 749-753 ◽  
Author(s):  
Jiang Wu ◽  
Qi Jiang ◽  
Siming Chen ◽  
Mingchu Tang ◽  
Yuriy I. Mazur ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Infrared Photodetectors ◽  
Silicon Substrates ◽  
Mid Infrared ◽  
Monolithically Integrated ◽  
Gaas Quantum Dot

scholarly journals Numerical analysis of spontaneous mid-infrared light emission from terbium ion doped multimode chalcogenide fibers

2018 ◽  
Vol 199 ◽  
pp. 112-115 ◽  
Author(s):  
Slawomir Sujecki ◽  
Lukasz Sojka ◽  
Elzbieta Pawlik ◽  
Krzysztof Anders ◽  
Ryszard Piramidowicz ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Light Emission ◽  
Infrared Light ◽  
Mid Infrared ◽  
Terbium Ion

Mid-infrared light emission from a Fe2+:ZnSe polycrystal using quantum cascade laser pumping

2014 ◽  
Vol 105 (14) ◽  
pp. 141108 ◽  
Author(s):  
Yu Song ◽  
Jens Sonntag ◽  
Sergey B. Mirov ◽  
Claire F. Gmachl ◽  
Jacob B. Khurgin
Keyword(s):  
Quantum Cascade Laser ◽  
Light Emission ◽  
Infrared Light ◽  
Mid Infrared ◽  
Quantum Cascade ◽  
Laser Pumping
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