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Type-0 Spontaneous Parametric Down Conversion in AlGaAs Bragg Reflection Waveguides

Rolf T. Horn, Payam Abolghasem, Bhavin J. Bijlani, Amr Saher Helmy, Gregor Weihs

Published Jan 1, 2011• 0 citations
Publisher

Abstract

By analyzing the time correlation between two single photon detector events, we demonstrate Spontaneous Parametric Down Conversion of a picosecond pulsed laser in an AlGaAs ridge Bragg Reflection Waveguide.
DOI
10.1364/qels.2011.qthn2

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In this paper, we present Bragg reflection waveguides as a novel universal platform for reaching the phasematching of spontaneous parametric downconversion process in semiconductor materials. We have designed two different waveguide structures. The first one is based on AlGaN and it is able to produce spectrally uncorrelated photon pairs. The second one is based on AlGaAs and it allows us to generate entangled photon pairs with ultra-broad spectra. Spontaneous-parametric-downconversion and second-harmonic-generation experiments are presented.
Entangled photons are important for testing foundations of quantum physics and are at the heart of quantum technology. Integrated photonics has overwhelming dominance in terms of density and performance, making it a promise route for scalable quantum information processing. AlGaAs-based materials having large second-order non-linearities, direct bandgap and strong electro-optical effect can offer distinct advantages in quantum light source. Here we report a non-ideal quarter-wavelength Bragg reflection waveguide for generating three types of spontaneous parametric down-conversion processes. A general solution to the dispersion equation is derived and employed for designing high efficiency devices by taking into account the influence of core layer aluminium concentration. We further design and fabricate a Bragg reflection waveguide sample based on the analysis, and experimentally characterize its phase matching types and spectral brightness. Our work paves the path for the development of portable quantum light sources.