Nonreciprocal acoustic transmission in cascaded resonators via spatiotemporal modulation

Systems that break transport reciprocity have recently opened exciting possibilities for wave manipulation. Here we report nonreciprocal acoustic transmission in cascaded resonators that are modulated in space and time. An analytic approach is developed and the design strategy is discussed for realizing a physical system based on this approach. The theory is verified numerically by finite-difference time-domain (FDTD) simulations, with a one-way isolation factor greater than 25 dB out of just two resonators. Our work provides a feasible route to achieve nonreciprocal acoustic transmission in a compact manner.

Duke Scholars

Author Steven A. Cummer Electrical and Computer Engineering