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. 2016 Dec 1;6:38235. doi: 10.1038/srep38235

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Copyright © 2016, The Author(s)

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(a) BLS intensity (logarithmic scale) as a function of the distance to the micro-strip antenna. Green rectangles and blue upward triangles: Spin-wave intensity arising from the interplay between the parametric amplification and the spin-wave excitation. Between these two measurements, the phase of the pumping field ϕ_p,0 was shifted. Red circles: Pumping only. Violet downward triangles: spin-wave excitation at the antenna only. The shading represents the spatial extent of the amplifier. (b) Intensity measured at a distance of 7 μm (marked by the orange arrow in (a)) behind the centre of the amplifier as a function of the induced phase shift Δϕ_sp between the signal wave and the pumping field as well as of the resulting phase shift Δϕ_si between the signal and the idler waves. The red line represents a fit according to Eq. 5.