Fig. 4: High-frequency detection of superconducting Pb film and cavity size.
From: A system for probing Casimir energy corrections to the condensation energy
Black data are amplitude (left plots) and phase (right plots) of the movable plate for each trial, along with fits to a Duffing model with ω0 = 805.4 kHz and Q ≈ 3500 (red lines). Uncertainties for the amplitude measurements are smaller than the symbol size. Phase uncertainties are one standard deviation uncertainties propagated from the measured statistical uncertainties in the x and y quadratures. Regions, where the plate comes into contact with the oxide pillars, are highlighted in pink. As the plate is swept through its resonance, the Pb resistance is recorded and scaled to units of the temperature change (blue data) using the slope of the superconducting transition. Note that ΔT = 0 µK is arbitrary from plot to plot. The green boxes indicate the regions of data that are used to quantify the one standard deviation uncertainty of the ΔT measurements (28 µK for each point)
