Author(s): Wu J; Yousefzadeh B;

We investigate the phenomenon of parametric instability in discrete models of spatiotemporally modulated materials. These materials are celebrated in part because they exhibit nonreciprocal transmission characteristics. However, parametric instability may occur for strong modulations, or occasionally even at very small modulation amplitudes, and prevent t ...

Article GUID: 41250313

Author(s): Kogani A; Yousefzadeh B;

Nonreciprocity is most commonly associated with a large difference in the transmitted energy when the locations of the source and receiver are interchanged. This energy bias is accompanied by a difference in the transmitted phase. This work highlights the role of this phase bias in breaking reciprocity in the steady-state vibration transmission characteri ...

Article GUID: 41201270

Author(s): Wu J; Yousefzadeh B;

Waveguides subject to spatiotemporal modulations are known to exhibit nonreciprocal vibration transmission, whereby interchanging the locations of the source and receiver changes the end-to-end transmission characteristics. The scenario of typical interest is unidirectional transmission in long, weakly modulated systems: when transmission is possible in o ...

Article GUID: 39976602