Spin-lasers with periodic gratings: toward ultrafast polarization modulation

Oliver J. Hejtman; Tibor Fördös; Mariusz Drong; Kamil Postava

doi:10.1117/12.2664204

12 December 2022 Spin-lasers with periodic gratings: toward ultrafast polarization modulation

Oliver J. Hejtman, Tibor Fördös, Mariusz Drong, Kamil Postava

Proceedings Volume 12502, 22nd Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 125020G (2022) https://doi.org/10.1117/12.2664204
Event: 22nd Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2022, Wojanow, Poland

Abstract

The main goal of this study is to explore possibilities of using cavities with dielectric or semiconductor grating as a main building block of spin-injected vertical-cavity surface-emitting lasers (spin-VCSELs) for ultrafast data transfer up to hundreds of Gb/s. Spin-VCSELs allow direct control of emitted polarization by means of electron spin injection. Compared to intensity-modulated VCSELs, the information is encoded into polarization state of light. Shorter response time is offered as a result of introducing anisotropy, in this case via periodic grating, which couples circularly-polarized photons, emitted in spin-polarized quantum wells. Precise modeling of the lasing regime is essential and based upon theory developed in our previous work. Eigenmodes of cavity with periodic structures are extracted using effective medium theory implemented in the transfer matrix formalism. Mathematical tools allow us to calculate optimal parameters of birefringent grating and consequently to design the cavities with required functionality. Particular focus is put on calculation of photon lifetimes, generalized confinement factors and frequencies of eigenmodes, which are necessary for studying dynamical performance of grating-based spin-VCSELs. According to the numerical model, desired gratings and grating-based cavities can be fabricated using PVD deposition of dielectric material sophisticated by lithographic techniques along with sample etching.

Citation Download Citation

Oliver J. Hejtman, Tibor Fördös, Mariusz Drong, and Kamil Postava "Spin-lasers with periodic gratings: toward ultrafast polarization modulation", Proc. SPIE 12502, 22nd Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 125020G (12 December 2022); https://doi.org/10.1117/12.2664204

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KEYWORDS

Ultrafast phenomena

Anisotropy

Birefringence

Quantum wells

Dielectric polarization

Gallium arsenide

Modulation

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