Silicon germanium quantum cascade heterostructures for far-infrared emission

2002 ◽  
Author(s):  
Robert W. Kelsall ◽  
Zoran Ikonic ◽  
Paul Harrison ◽  
Stephen A. Lynch ◽  
Robert Bates ◽  
...  
Keyword(s):  
Silicon Germanium ◽  
Far Infrared ◽  
Infrared Emission ◽  
Quantum Cascade

Far-infrared emission and Stark-cyclotron resonances in a quantum-cascade structure based on photon-assisted tunneling transition

2000 ◽  
Vol 61 (12) ◽  
pp. 8369-8374 ◽  
Author(s):  
Stéphane Blaser ◽  
Michel Rochat ◽  
Mattias Beck ◽  
Jérôme Faist ◽  
Ursula Oesterle
Keyword(s):  
Far Infrared ◽  
Infrared Emission ◽  
Quantum Cascade ◽  
Tunneling Transition ◽  
Cascade Structure ◽  
Assisted Tunneling ◽  
Quantum Cascade Structure

Terahertz-Emitting Silicon-Germanium Devices

2002 ◽  
Vol 744 ◽  
Author(s):  
Ralph T. Troeger ◽  
Thomas N. Adam ◽  
Samit K. Ray ◽  
Pengcheng Lv ◽  
Ulrike Lehmann ◽  
...  
Keyword(s):  
Silicon Germanium ◽  
Far Infrared ◽  
Infrared Emission ◽  
X Ray Diffraction ◽  
Wide Range ◽  
Spectral Peaks ◽  
Current Densities ◽  
Ftir Spectrometer ◽  
Lock In ◽  
Good Agreement

ABSTRACTIn this paper we report on far-infrared emission in the 1–12 THz frequency range from strained SiGe structures. Pseudomorphic superlattices were grown by Molecular Beam Epitaxy (MBE) at the relatively low substrate temperature of 400°C to prevent germanium segregation. Layer thicknesses, composition, and crystallinity were confirmed by high-resolution X-ray diffraction. Devices were designed to produce confined hole states with various energy separations. Mesa devices were etched in a reactive-ion etching system and tested for edge emission over a wide range of drive currents using an FTIR spectrometer in step-scan mode. THz emission was observed in pulsed mode at current densities as low as 50 A/cm2 and at temperatures as high as 50 K, using a liquid-helium-cooled silicon bolometer detector with a lock-in amplifier. Emission spectral peaks occurred at 7.9 and 9.36 THz for two different samples, in good agreement with k·p calculations.

Silicon-Germanium Quantum-Cascade Lasers

2003 ◽  
Vol 13 (02) ◽  
pp. 547-573 ◽  
Author(s):  
Robert W. Kelsall ◽  
Richard A. Soref
Keyword(s):  
Silicon Germanium ◽  
Quantum Cascade Lasers ◽  
Far Infrared ◽  
Quantum Cascade ◽  
Surface Emission ◽  
Experimental Activity ◽  
Optoelectronic Integration ◽  
Cascade Lasers ◽  
Intersubband Laser

The prospects and advantages of silicon germanium quantum cascade lasers are discussed, from both physical and technological perspectives. A range of Si/SiGe intersubband laser configurations are discussed, for both edge and surface emission. Recent experimental activity on mid- and far-infrared devices is reviewed, and the value of detailed theoretical tools for heterostructure design is highlighted. Steps towards silicon optoelectronic integration are also considered.

Far infrared emission from magnetically quantised 2DEGs in GaAs/(AlGa)As heterojunctions

1994 ◽  
Vol 305 (1-3) ◽  
pp. 280-284 ◽  
Author(s):  
N.N. Zinov'ev ◽  
R. Fletcher ◽  
L.J. Challis ◽  
B. Sujak-Cyrul ◽  
A.V. Akimov ◽  
...  
Keyword(s):  
Far Infrared ◽  
Infrared Emission

scholarly journals Far-Infrared Emission from Clumpy Irregular Galaxies

1987 ◽  
Vol 115 ◽  
pp. 647-647
Author(s):  
U. Klein ◽  
J. Heidmann ◽  
R. Wielebinski ◽  
E. Wunderlich
Keyword(s):  
Star Formation ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Hubble Constant ◽  
Far Infrared ◽  
Hii Regions ◽  
Infrared Emission ◽  
Star Forming ◽  
Irregular Galaxies

The four clumpy irregular galaxies Mkr 8, 296,297 and 325 have been observed by IRAS. All galaxies have been detected in at least two of the four detector bands. The ratios of the 100 to 60-m flux densities are comparable to those of HII regions or violently star forming galaxies. The average star formation rate in clumpy irregular galaxies is of the order of a few solar masses per year (based on their average far-infrared luminosity and a Hubble constant of 75 km s−1 Mpc−1.

Energy Sources of the Far‐Infrared Emission of M33

2004 ◽  
Vol 154 (1) ◽  
pp. 259-265 ◽  
Author(s):  
J. L. Hinz ◽  
G. H. Rieke ◽  
K. D. Gordon ◽  
P. G. Perez‐Gonzalez ◽  
C. W. Engelbracht ◽  
...  
Keyword(s):  
Far Infrared ◽  
Infrared Emission ◽  
Energy Sources
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