Acoustic analogy of Rabi rotations in coupled microcavities based on porous silicon

A theoretical and experimental study of acoustic wave coupling in strongly coupled microcavities is presented. Here, we propose an acoustic analogy of Rabi rotations in a system based on porous silicon. We realize a structure consisting of two coupled acoustics microcavities fabricated by electrochemical etching from doped p-type (100) silicon wafers. We measure the acoustic transmission spectra in the frequency domain, and by using the Fourier transform, we obtain the transmission in the time domain. The acoustic transmission spectra of the fabricated sample show the two characteristic acoustic cavity modes, and the analysis in the time domain shows the Rabi-like oscillations originally observed in quantum systems. The experimental results are in good agreement with the transfer matrix and time-resolved acoustic interference theoretical methods used in the study. •We show theoretical and experimental demonstrations of acoustic Rabi oscillations in porous silicon structures.•We propose a method by which the coherent evolution of acoustic excitations can be studied in detail.•Our theoretical results and experimental measurements are in good agreement.