Microwave-assisted coherent and nonlinear control in cavity piezo-optomechanical systems

We present a cavity piezo-optomechanical system where microwave and optical degrees of freedom are coupled through an ultrahigh-frequency mechanical resonator. By utilizing the coherence among the three interacting modes, we demonstrate optical amplification, coherent absorption, and a more general asymmetric Fano resonance. The strong piezoelectric drive further allows access to the large-amplitude-induced optomechanical nonlinearity, with which optical transparency at higher harmonics through multiphonon scattering is demonstrated.

Figure 1

(a) The SEM image of the device showing the microdisk resonator and the coupling waveguide (purple) and the gold electrodes (yellow). (b) Normalized optical transmission. (c) Power spectra of the first three mechanical radial-contour modes. The insets show the finite-element simulation of the normalized radial displacement profiles. (d) Schematics of the measurement setup.

Figure 2

(a) and (b) Probe transmission plotted against $|{\Omega }_c-{\Omega }_p|$ as $\sqrt{n_m/n_p}$ is varied. The left insets show the energy-level diagrams and the right insets plot the transmission coefficient in the complex plane. (c) Plot of $T$ in the complex plane as $\phi$ is varied. (d) Contour plot of $\left|T\right|$ against $|{\Omega }_c-{\Omega }_p|$ and $\phi$. (e) Cross-sectional plot of (d) at various $\phi$.

Figure 3

(a) Schematic illustrating the interaction between the control and probe light through multiphonon scattering. (b) Driven response under weak (blue) and strong (red) microwave drive plotted against frequency. (c) Same data as in (b) plotted in the complex plane. Data with weak drive (blue) is magnified by 4 times. (d) Transmission spectra of the probe when ${\Delta }_c$ is at integral multiple of the mechanical resonance frequency.