Mr. Markus Burghard Profile

Markus Burghard

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Proceedings Article | 20 August 2020 Presentation + Paper

Intensity and polarization dynamics in ultrafast birefringent spin-VCSELs

Markus Lindemann, Natalie Jung, Markus Burghard, Tobias Pusch, Gaofeng Xu, Igor Žutić, Dan Birkedal, Rainer Michalzik, Martin Hofmann, Nils Gerhardt

Proceedings Volume 11470, 114702H (2020) https://doi.org/10.1117/12.2567628

KEYWORDS: Polarization, Vertical cavity surface emitting lasers, Birefringence, Ultrafast phenomena, Modulation, Telecommunications, Quantum wells, Picosecond phenomena, Spintronics, Spin dynamics, Spin polarization

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Since todays Internet traffic is more and more concentrated in hyperscale datacenters,¹ new concepts for shortrange optical communication systems with high modulation bandwidth, high temperature stability, and low energy consumption are urgently needed. Birefringent spin-lasers, in particular spin-controlled vertical-cavity surface-emitting lasers (spin-VCSELs), are a novel type of ultrafast laser devices which promise to serve as ultrafast transmitters for the next generation of optical communication systems. While current-driven intensitymodulated VCSELs are state-of-the-art laser devices for short-range communication, their modulation bandwidth is limited to values below 40 GHz.^{2, 3} Recently, we were able to demonstrate that modulating carrier spin and light polarization in spin-VCSELs instead of carrier density and light intensity in conventional devices enables ultrafast polarization dynamics and a modulation bandwidth of more than 200 GHz.⁴ This high modulation bandwidth was achieved by increasing the resonance frequency of the coupled carrier spin-photon system by implementing high values of birefringence to the cavity of 850 nm GaAs/GaAlAs VCSELs. Here, we show experimental results for the intensity and polarization dynamics in highly birefringent spin-VCSELs as a function of bias current, birefringence, and temperature and demonstrate the capability of spin-VCSELs for ultralow energy consumption and high temperature stability. Furthermore, we present first results on polarization dynamics in 1.3 μm VCSELs for potential long-range communication systems and discuss novel concepts for future integrated and electrically pumped devices.

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