Open AccessFano‐Like Acoustic Resonance for Subwavelength Directional Sensing: 0–360 Degree Measurement
Author(s) -
Lee Taehwa,
Nomura Tsuyoshi,
Su Xiaoshi,
Iizuka Hideo
Publication year - 2020
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201903101
Subject(s) - resonator , acoustics , coupling (piping) , resonance (particle physics) , optics , acoustic wave , helmholtz resonator , fano resonance , physics , optoelectronics , materials science , plasmon , particle physics , metallurgy
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.