scholarly journals Ladder approximation in coupled quantum-well systems

2001 ◽  
Vol 63 (12) ◽  
Author(s):  
A. Yurtsever ◽  
B. Tanatar
Keyword(s):  
Quantum Well ◽  
Ladder Approximation ◽  
Coupled Quantum Well

scholarly journals Asymmetric Ge/SiGe coupled quantum well modulators

Nanophotonics ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1765-1773
Author(s):  
Yi Zhang ◽  
Jianfeng Gao ◽  
Senbiao Qin ◽  
Ming Cheng ◽  
Kang Wang ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Quantum Well ◽  
Quantum Wells ◽  
High Speed ◽  
Low Voltage ◽  
Extinction Ratio ◽  
High Frequency Response ◽  
Modulation Format ◽  
Silicon Photonic ◽  
Coupled Quantum Well

Abstract We design and demonstrate an asymmetric Ge/SiGe coupled quantum well (CQW) waveguide modulator for both intensity and phase modulation with a low bias voltage in silicon photonic integration. The asymmetric CQWs consisting of two quantum wells with different widths are employed as the active region to enhance the electro-optical characteristics of the device by controlling the coupling of the wave functions. The fabricated device can realize 5 dB extinction ratio at 1446 nm and 1.4 × 10−3 electrorefractive index variation at 1530 nm with the associated modulation efficiency V π L π of 0.055 V cm under 1 V reverse bias. The 3 dB bandwidth for high frequency response is 27 GHz under 1 V bias and the energy consumption per bit is less than 100 fJ/bit. The proposed device offers a pathway towards a low voltage, low energy consumption, high speed and compact modulator for silicon photonic integrated devices, as well as opens possibilities for achieving advanced modulation format in a more compact and simple frame.

Nonlinear resonant optical rectification in a coupled quantum well

1996 ◽  
Vol 361-362 ◽  
pp. 401-405 ◽  
Author(s):  
K. Unterrainer ◽  
J.N. Heyman ◽  
K. Craig ◽  
B. Galdrikian ◽  
M.S. Sherwin ◽  
...  
Keyword(s):  
Quantum Well ◽  
Optical Rectification ◽  
Coupled Quantum Well

Coherent dynamics of radiatively coupled quantum-well excitons

1996 ◽  
Vol 53 (4) ◽  
pp. 2026-2033 ◽  
Author(s):  
T. Stroucken ◽  
A. Knorr ◽  
P. Thomas ◽  
S. W. Koch
Keyword(s):  
Quantum Well ◽  
Coherent Dynamics ◽  
Coupled Quantum Well

Far-Infrared Modulated Photocurrent in GaAs/AlGaAs Coupled Quantum Well Tunnelling Structures

1996 ◽  
pp. 43-47 ◽  
Author(s):  
R. J. Stone ◽  
J. G. Michels ◽  
S. L. Wong ◽  
C. T. Foxon ◽  
R. J. Nicholas ◽  
...  
Keyword(s):  
Quantum Well ◽  
Far Infrared ◽  
Coupled Quantum Well

Electric field control of spin polarity in spin injection into InGaAs quantum dots from a tunnel-coupled quantum well

2019 ◽  
Vol 114 (13) ◽  
pp. 133101 ◽  
Author(s):  
Hang Chen ◽  
Satoshi Hiura ◽  
Junichi Takayama ◽  
Soyoung Park ◽  
Kazuhisa Sueoka ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electric Field ◽  
Quantum Well ◽  
Spin Injection ◽  
Field Control ◽  
Coupled Quantum Well
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