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Published on: May 13, 2020
Selective polarization mode excitation in InGaAs/GaAs microtubes
Zhaobing Tian1, Venkat Veerasubramanian, Pablo Bianucci
1Department of Electrical and Computer Engineering, McGill University, Montreal, Canada. tianzhaobing@gmail.com
Researchers demonstrate selective polarization mode excitation in InGaAs/GaAs rolled-up microtubes. These microtubes function as optical-optical modulators, utilizing the thermal-optical effect for tunable light manipulation.
Area of Science:
- Semiconductor Nanotechnology
- Optoelectronics
- Materials Science
Background:
- Rolled-up microtubes offer unique optical properties due to their 3D nanostructure.
- InGaAs/GaAs quantum dot layers are crucial for optoelectronic applications.
- Controlling light polarization is essential for advanced optical devices.
Purpose of the Study:
- To investigate selective polarization mode excitation in InGaAs/GaAs rolled-up microtubes.
- To explore the potential of these microtubes as optical-optical modulators.
- To demonstrate tunable light modulation using the thermal-optical effect.
Main Methods:
- Fabrication of InGaAs/GaAs quantum dot microtubes via selective layer release.
- Utilizing optical fiber tapers for microtube manipulation and light coupling.
- Varying light polarization to excite different optical modes (transverse electric and transverse magnetic).
Main Results:
- Successfully achieved selective polarization mode excitation in the microtubes.
- Observed both transverse electric and transverse magnetic modes by adjusting light polarization.
- Demonstrated the microtube's capability as an optical-optical modulator from red to infrared wavelengths.
Conclusions:
- InGaAs/GaAs rolled-up microtubes enable controlled excitation of specific optical modes.
- The thermal-optical effect in these microtubes allows for effective optical-optical modulation.
- These findings pave the way for novel tunable optoelectronic devices.
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