Coplanar stripline antenna design for optically detected magnetic resonance on semiconductor quantum dots

Klotz, F.; Huebl, H.; Heiss, D.; Klein, K.; Finley, J. J.; Brandt, M. S.
July 2011
Review of Scientific Instruments;Jul2011, Vol. 82 Issue 7, p074707
Academic Journal
We report on the development and testing of a coplanar stripline antenna that is designed for integration in a magneto-photoluminescence experiment to allow coherent control of individual electron spins confined in single self-assembled semiconductor quantum dots. We discuss the design criteria for such a structure which is multi-functional in the sense that it serves not only as microwave delivery but also as electrical top gate and shadow mask for the single quantum dot spectroscopy. We present test measurements on hydrogenated amorphous silicon, demonstrating electrically detected magnetic resonance using the in-plane component of the oscillating magnetic field created by the coplanar stripline antenna necessary due to the particular geometry of the quantum dot spectroscopy. From reference measurements using a commercial electron spin resonance setup in combination with finite element calculations simulating the field distribution in the structure, we obtain a magnetic field of 0.12 mT at the position where the quantum dots would be integrated into the device. The corresponding π-pulse time of ≈0.5 μs meets the requirements set by the high sensitivity optical spin read-out scheme developed for the quantum dot.


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