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. Author manuscript; available in PMC: 2024 Mar 14.
Published in final edited form as: Phys Rev Appl. 2020;13(4):10.1103/physrevapplied.13.044026. doi: 10.1103/physrevapplied.13.044026

FIG. 8.

FIG. 8.

Second-order nonlinear permittivity, εˆ(2)=ε(2)-iε(2), inferred from the ω1+ω2 mixing product. In the frequency-dependent measurements, we vary the angular frequency of one of the stimulus signals, ω1, while the other stimulus frequency, ω2, is held constant at 2π×5GHz. In our bias-swept measurements we set ω1=2π×7.84GHz and ω2=2π×7.76GHz. To facilitate comparison to Fig. 7, we indicate an interval of width ENL centered around the Edc=0Vμm-1. The error bars (gray) are the 95% confidence interval from the standard error of the mean. (a) Real part, ε(2). (b) Imaginary part, ε(2). (c) Absolute value of εˆ(2) near 0 Vμm-1.