Non-reciprocal sound propagation in space-time modulated media
arXiv:1811.04130 · doi:10.1103/PhysRevB.99.144311
Abstract
Realization of non-reciprocal devices, such as isolators and circulators, is of fundamental importance in microwave and photonic communication systems. This can be achieved by breaking time-reversal symmetry in the system or exploiting nonlinearity and topological effects. However, exploration of non-reciprocal devices remains scarce in acoustic systems. In this work, sound propagation in a space-time modulated medium is theoretically studied. Finite-difference time-domain (FDTD) simulations are carried out to verify the results. Functionalities such as mode conversion, parametric amplification and phase conjugation are demonstrated.
11 pages, 5 figures
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- Pure and Linear Frequency Converter Temporal Metasurface
- Space-Time Medium Functions as a Perfect Antenna-Mixer-Amplifier Transceiver
- Transfer matrix method for the analysis of space-time modulated media and systems
- Space-Time Phononic Crystals with Anomalous Topological Edge States
- Time-dependent high-contrast subwavelength resonators
- Non-reciprocal wave propagation in discretely modulated spatiotemporal plates
- Sound diffusion with spatiotemporally modulated acoustic metasurfaces
- A multiple scattering formulation for elastic wave propagation in space-time modulated metamaterials
- Four-Dimensional Wave Transformations By Space-Time Metasurfaces
- Band-gap tuning in 2D spatiotemporal phononic crystals
- Highly Linear Nonmagnetic Circulator Enabled By A Temporal Nonreciprocal Phase Shifter