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Tim Zander¹, Andreas Herklotz, Suwit Kiravittaya

¹Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany. t.zander@fkf.mpg.de

|January 7, 2010

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We demonstrate tunable optical resonators with embedded quantum dots (QDs) using piezoelectric actuators. Applying strain shifts QD and optical mode energies, enabling precise control for potential exciton resonance applications.

Area of Science:

Semiconductor physics
Optoelectronics
Materials science

Background:

Gallium arsenide (GaAs) microring optical resonators are crucial for integrated photonics.
InGaAs quantum dots (QDs) offer unique light-emission properties.
Controlling optical modes and QD emission is essential for advanced photonic devices.

Purpose of the Study:

To investigate the strain-tunability of GaAs microring resonators with embedded InGaAs QDs.
To analyze the energy shifts of both QDs and optical modes under applied biaxial stress.
To explore the potential of this technique for achieving exciton resonance.

Main Methods:

Fabrication of GaAs microring resonators with embedded InGaAs QDs.
Integration with Pb(Mg(1/3)Nb(2/3))O(3)-PbTiO(3) piezoelectric actuators for strain application.

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Low-temperature optical measurements to observe emission and mode shifts.

Application of linear deformation potential theory and finite element method for strain estimation.

Main Results:

Reversible stretching and squeezing of microcavities achieved via piezoelectric actuators.
Observed red- and blue-shifting of QD and optical mode emission energies with applied strain.
QD emission shifted more rapidly than optical modes, allowing strain estimation.
Excitonic emissions from different QDs shifted at different rates.

Conclusions:

Strain-tunable optical resonators with embedded QDs are successfully realized.
The technique allows for precise control over QD and optical mode energies.
Differential shifting of excitons suggests potential for achieving spatial exciton resonance.