Extended Data Fig. 9: Resonator coherent response.
From: Non-Hermitian chiral phononics through optomechanically induced squeezing
a, Amplitude |ai| (blue, left axis) and phase ϕi (red, right axis) of the complex response \({a}_{i}({\Delta })={{\rm{e}}}^{{\rm{i}}({\phi }_{i}({\Delta })+{\alpha }_{i})}|{a}_{i}({\Delta })|\) of resonators 1 through 4 (resonance frequencies ωi) to a drive laser modulation at a frequency ωd close to resonance (drive detuning Δ = ωd − ωi). αi is the phase offset due to signal delay through the set-up. A Lorentzian response \({a}_{i}={{\rm{e}}}^{{\rm{i}}{\alpha }_{i}}{A}_{i}\frac{{\gamma }_{i}/2}{{\rm{i}}{\gamma }_{i}/2-{\Delta }}\) is fitted to the data (dashed). b, Phase offset αi versus resonance frequency ωi/(2π). A linear fit (dashed) of αi = −ωiτ implies a signal delay τ = 106.7 ns. Error bars in a reflect the spread in repeated measurement, whereas the error bars in b correspond to fit uncertainty and are smaller than the symbol size (Methods section ‘Error estimation’). a.u., arbitrary units.
