This article is cited in 3 papers

NONLINEAR DYNAMICS

Spectral characteristics and time dynamics of tunable acoustic resonators in the strong coupling regime

M. A. Miroliubov^ab, A. K. Samusev^a, I. D. Toftul^a, M. I. Petrov<sup>a

a</sup> School of Physics and Engineering, ITMO University, St. Petersburg, 197101 Russia
^b Academic Lyceum Physical-Technical High School named after Zh. I. Alfyorov, St. Petersburg National Research Academic University, Russian Academy of Sciences, St. Petersburg, 194021 Russia

Abstract: Strong coupling between resonant systems is one of the remarkable phenomena in different areas of physics such as condensed matter physics, quantum optics, nanophotonics, and plasmonics. However, the strong coupling regime is often hardly achievable because it requires special experimental conditions, which ensure an increase in the coupling strength and the reduction of losses in interacting systems. A transition from the weak coupling regime to the strong coupling regime is demonstrated in this work in the system of coupled Fabry–Pérot acoustic resonators, where the coupling strength is larger than the characteristic losses in resonators by a factor of 3.5. The strong coupling regime is demonstrated in both the spectral and time domains. The results are important for the development of modern acoustic systems implementing, in particular, the slow sound regime or regimes serving for the high-$Q$-factor frequency filtering and highly sensitive acoustic detection.

Received: 23.03.2021
Revised: 26.03.2021
Accepted: 26.03.2021

DOI: 10.31857/S1234567821080115

 English version: Journal of Experimental and Theoretical Physics Letters, 2021, 113:8, 547–553

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