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Electro-optic and electro-absorption characterization of InAs quantum dot waveguides
Imran B Akca1, Aykutlu Dana, Atilla Aydinli
1Materials Science and Nanotechnology Program, Physics Department, Bilkent University, 06800, Ankara, Turkey. imran@bilkent.edu.tr
Optics Express
|June 11, 2008
Summary
Optical properties of Indium Arsenide (InAs) quantum dot waveguides were enhanced by electric fields. These quantum dot structures show improved electro-optic efficiency and spectral shifts, offering potential for advanced photonic devices.
Area of Science:
- Optoelectronics
- Materials Science
- Quantum Dot Technology
Background:
- Semiconductor waveguides are crucial for optical communication.
- Indium Arsenide (InAs) quantum dots offer unique optical properties.
- Understanding electro-optic effects in nanostructures is key for device development.
Purpose of the Study:
- To investigate the optical properties of InAs quantum dot waveguides under an applied electric field.
- To quantify the electro-optic efficiency and spectral response of these structures.
- To compare the performance with traditional bulk materials.
Main Methods:
- Multilayer InAs quantum dot waveguides were grown using molecular beam epitaxy.
- Fabry-Perot measurements were conducted at 1515 nm to assess electro-optic efficiency.
- Electro-absorption measurements were performed at 1300 nm to analyze spectral changes.
Main Results:
- InAs/GaAs quantum dot structures exhibited significantly enhanced linear electro-optic efficiency compared to bulk GaAs.
- Applied electric fields led to increased absorption and a red shift in spectra.
- Spectral shifts reached up to 21% under an 18 Volt bias at 1320 nm.
Conclusions:
- Multilayer InAs quantum dot waveguides demonstrate superior electro-optic performance.
- The observed spectral shifts and enhanced efficiency are promising for tunable photonic applications.
- These findings highlight the potential of quantum dots in advanced optoelectronic devices.
