Robust temporal adiabatic passage with perfect frequency conversion between detuned acoustic cavities.

Area of Science:

• Acoustics
• Wave physics
• Quantum optics

Background:

• Phase matching is crucial for efficient energy transfer in classical wave phenomena like waveguide coupling and nonlinear optical frequency conversion.
• Existing methods often require precise tuning and are sensitive to environmental changes, limiting their practical applications.

Purpose of the Study:

• To propose and demonstrate a novel temporal quasi-phase matching method for achieving robust and complete acoustical energy transfer between detuned cavities.
• To explore the potential of time-dependent modulations for advanced wave steering and frequency conversion.

Main Methods:

• Acoustic energy transfer was implemented in a three-cavity system (A, B, C) with time-varying couplings between adjacent cavities.
• Coupling amplitudes were modulated using time-delayed Gaussian functions, and coupling signs were periodically flipped to counteract temporal phase mismatching.
• The method draws an analogy to stimulated Raman adiabatic passage for controlled energy transfer.

Main Results:

• Robust and complete acoustic energy transfer from cavity A to cavity C was successfully achieved, even with arbitrarily detuned cavities.
• The non-reciprocal frequency conversion properties of the demonstrated system were experimentally verified.
• The proposed method shows resilience against detuning and phase mismatching.

Conclusions:

• The developed temporal quasi-phase matching technique offers a powerful new approach for controlling wave energy transfer.
• This research significantly advances the field of wave steering using time-dependent modulations.
• The findings hold promise for extending frequency conversion techniques to nonlinear and non-Hermitian systems.