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Ultrafast all optical switching via tunable Fano interference.
Jin-Hui Wu1, Jin-Yue Gao, Ji-Hua Xu
1College of Physics, Jilin University, Changchun 130023, People's Republic of China. wujinhui0431@sina.com
Physical Review Letters
|August 11, 2005
Summary
Quantum interference in asymmetric double quantum wells can be controlled with light. This enables a novel all-optical ultrafast switch with picosecond response times.
Area of Science:
- Quantum optics
- Semiconductor heterostructures
- Ultrafast phenomena
Background:
- Quantum interference in asymmetric double quantum wells is sensitive to external fields.
- All-optical switching is crucial for high-speed information processing.
Purpose of the Study:
- To investigate the modulation of quantum interference using an external control light beam.
- To propose and analyze a novel all-optical ultrafast switch based on this phenomenon.
Main Methods:
- Dressed-state picture analysis of quantum interference.
- Theoretical modeling of a semiconductor heterostructure for all-optical switching.
Main Results:
- Quantum interference is effectively modulated by an external light beam.
- The proposed switch demonstrates frequency bandwidths of approximately 0.1 THz.
- The switch exhibits ultrafast response and recovery times of around 1 picosecond.
Conclusions:
- External light control offers a viable method for modulating quantum interference in asymmetric double quantum wells.
- The developed all-optical switch shows promise for high-speed photonic applications.
- The study highlights the potential of quantum interference in designing advanced optical devices.