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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
Published on: April 24, 2014
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Room temperature polariton light emitting diode with integrated tunnel junction
Optics Express
|February 12, 2014
Summary
This study demonstrates a diode with 12 GaAs quantum wells emitting exciton-polaritons at room temperature. The device shows distinct polariton branches and temperature-dependent behavior, paving the way for novel optoelectronic applications.
Area of Science:
- Semiconductor Optoelectronics
- Quantum Physics
- Materials Science
Background:
- Exciton-polaritons are quasiparticles formed from the strong coupling of excitons and photons.
- Achieving room-temperature operation of exciton-polariton devices is crucial for practical applications.
- Efficient current injection is a key challenge in semiconductor devices with multiple quantum wells.
Purpose of the Study:
- To engineer a diode with multiple GaAs quantum wells for room-temperature exciton-polariton emission.
- To investigate the optical properties and behavior of exciton-polaritons in the fabricated device.
- To enhance current injection efficiency using a tunnel junction.
Main Methods:
- Fabrication of a diode structure with 12 Gallium Arsenide (GaAs) quantum wells.
- Incorporation of a reversely biased tunnel junction within the cavity for improved current injection.
- Electroluminescence and photoluminescence spectroscopy to study polariton emission and behavior.
- Temperature-dependent and bias-dependent optical measurements.
Main Results:
- Observation of light emission from exciton-polariton states at room temperature.
- Identification of two distinct polariton branches with a Rabi splitting of 6.5 meV.
- Demonstration of polariton branch anticrossing at temperatures below room temperature.
- Observation of a Stark shift in polariton branches under applied bias.
Conclusions:
- The developed GaAs quantum well diode successfully exhibits room-temperature exciton-polariton emission.
- The integrated tunnel junction effectively enhances current injection, enabling device operation.
- The observed anticrossing and Stark shift provide insights into polariton dynamics and device tunability.
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