Non-reciprocal acoustic devices based on linear or angular momentum biasing

摘要

A non-reciprocal acoustic device that accomplishes non-reciprocity via linear or angular-momentum bias. The non-reciprocal acoustic device includes an azimuthally symmetric or planar acoustical cavity (e.g., ring cavity), where the cavity is biased by imposing a circular or linear motion of a gas, a fluid or a solid medium filling the cavity. Acoustic waveguides are connected to the cavity or the cavity is excited from the surrounding medium. A port of this device is excited with an acoustic wave. When the cavity is biased appropriately, the acoustic wave is transmitted to one of the other acoustic waveguides while no transmission of the acoustic wave occurs at the other acoustic waveguides. As a result, linear non-reciprocity is now realized in acoustics without distorting the input signal or requiring high input power or bulky devices.

主权项

1. A non-reciprocal device comprising:
an azimuthally symmetric acoustical cavity with an angular momentum bias; a plurality of acoustic waveguides connected to said azimuthally symmetric acoustical cavity, wherein each of said plurality of acoustic waveguides is associated with an input and output port; and an input port of a first acoustic waveguide of said plurality of acoustic waveguides is excited with an acoustic wave; wherein said azimuthally symmetric acoustical cavity is biased in such a manner to induce total transmission of said acoustic wave to an output port of a second acoustic waveguide of said plurality of acoustic waveguides and no transmission of said acoustic wave to an output port of a third acoustic waveguide of said plurality of acoustic waveguides.