Journal
PHYSICAL REVIEW B
Volume 99, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.144311
Keywords
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Funding
- Multidisciplinary University Research Initiative grant from the Office of Naval Research [N00014-13-1-0631]
- Emerging Frontiers in Research and Innovation grant from the National Science Foundation [1641084]
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Realization of nonreciprocal 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 nonreciprocal devices remains scarce in acoustic systems. In this work, sound propagation in a space-time modulated medium is theoretically studied. Finite-difference time-domain simulations are carried out to verify the results. Functionalities such as mode conversion, parametric amplification, and phase conjugation are demonstrated.
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