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Publication - Professor Mark Thompson

    Temperature dependence of the Kerr nonlinearity and two-photon absorption in a silicon waveguide at 1:55μm

    Citation

    Sinclair, G, Tyler, N, Sahin, D, Barreto, J & Thompson, M, 2019, ‘Temperature dependence of the Kerr nonlinearity and two-photon absorption in a silicon waveguide at 1:55μm’. Physical Review Applied, vol 11.

    Abstract

    We measure the temperature dependence of the two-photon absorption and optical Kerr nonlinearity of a silicon waveguide over a range of temperatures from 5:5 to 300 K. Measurements are taken at a wavelength of 1:55 μm in the technologically important telecom C-band. We observe a near halving (45% reduction) of the two-photon absorption coefficient at low temperature, whereas a smaller reduction in the Kerr nonlinearity of 25% is found. The increased ratio of Kerr to absorptive nonlinearity at low temperatures indicates an improved operation of integrated photonic devices that make use of a nonlinear phase shift, such as optical switches or parametric photon-pair sources. As an example, we examine how the heralding efficiency of a photon-pair source will change at low temperatures and predict a modest improvement in source performance. In addition, the modelling and experimental techniques developed can readily be extended to other wavelengths or materials of interest.

    Full details in the University publications repository