소형 개인 음환경을 위한 메타물질 결합 초음파 트랜스듀서 설계 방법

키워드

확장요약문

Directional audio, enabling personal sound sweet spots and spatially selective audio delivery, typically rely on parametric acoustic arrays that leverage nonlinear interactions of ultrasound beams to overcome the directivity constraint dictated by the wavenumber-aperture product. Such systems, known as parametric array loudspeakers, require phased arrays comprising hundreds of ultrasonic emitters—posing challenges for widespread adoption due to high cost, system complexity, and limited design flexibility. In this talk, we introduce a new form factor: a compact, single-body ultrasonic transducer integrated with metamaterials, termed metamaterials-integrated parametric array loudspeakers (MiPALs). MiPALs utilize a single piezoelectric driver co-integrated with metamaterials— consisting of an acoustic metasurface aperture and elastic meta-units—to yield a simple, cost-effective, and highly integrated architecture. We demonstrate that the MiPAL generates ultra-broadband directional sound over four octaves, spanning from 500 Hz to 10 kHz. Our work underscore the potential of compact personal sound systems, laying the foundation for immersive audio, spatial sound delivery, and extended reality.