Directional sound sensing plays a critical role in many applications involving the localization of a sound source. However, the sensing range limit and fabrication difficulties of current acoustic sensing technologies pose challenges in realizing compact subwavelength direction sensors. Here, a subwavelength directional sensor is demonstrated, which can detect the angle of an incident wave in a full angle range (0°∼360°). The directional sensing is realized with acoustic coupling of Helmholtz resonators each supporting a monopolar resonance, which are monitored by conventional microphones. When these resonators scatter sound into free‐space acoustic modes, the scattered waves from each resonator interfere, resulting in a Fano‐like resonance where the spectral responses of the constituent resonators are drastically different from each other. This work provides a critical understanding of resonant coupling as well as a viable solution for directional sensing.

中文翻译：

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亚波长定向感测的类似于声的共振：0–360度测量

定向声音感测在涉及声源定位的许多应用中起着至关重要的作用。然而，当前的声感测技术的感测范围极限和制造困难在实现紧凑的亚波长方向传感器方面提出了挑战。在此，说明了一种亚波长方向传感器，该传感器可以在整个角度范围（0°〜360°）内检测入射波的角度。定向感测通过亥姆霍兹共振器的声耦合实现，每个均支持单极共振，并由常规麦克风进行监控。当这些谐振器将声音散射到自由空间声模中时，每个谐振器的散射波都会发生干扰，从而形成类似于Fano的谐振，其中组成谐振器的频谱响应会大大不同。