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Low-power spontaneous oscillations driven by band-filling effect.
Optics Letters
|November 2, 2013
Summary
Self-sustained oscillations were predicted in semiconductor nanocavities using band-filling dispersion. This method requires significantly lower input power for oscillation onset compared to two-photon absorption, enabling gigahertz frequencies.
Area of Science:
- Optoelectronics
- Semiconductor physics
- Nanophotonics
Background:
- Semiconductor nanocavities are crucial for optoelectronic devices.
- Generating self-sustained oscillations is key for applications like lasers and modulators.
- Existing methods often require high input power.
Purpose of the Study:
- To predict self-sustained oscillations in semiconductor nanocavities.
- To investigate the role of band-filling dispersion in oscillation generation.
- To compare the power requirements with existing methods.
Main Methods:
- Linear stability analysis.
- Numerical integration of a mean-field model.
- Theoretical prediction of oscillation dynamics.
Main Results:
- Predicted self-sustained oscillations at tens of gigahertz.
- Oscillation onset observed at low input power (~100 μW).
- Band-filling dispersion identified as the dominant effect.
Conclusions:
- Band-filling dispersion offers a more efficient pathway for generating oscillations in nanocavities.
- The predicted low power threshold is advantageous for device applications.
- This approach paves the way for novel gigahertz-frequency semiconductor devices.
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