Han Jinchi, Saravanapavanantham Mayuran, Chua Matthew R, Lang Jeffrey H, Bulović Vladimir
Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139 USA.
Microsyst Nanoeng. 2022 May 26;8:55. doi: 10.1038/s41378-022-00384-0. eCollection 2022.
We demonstrate a versatile acoustically active surface consisting of an ensemble of piezoelectric microstructures that are capable of radiating and sensing acoustic waves. A freestanding microstructure array embossed in a single step on a flexible piezoelectric sheet of polyvinylidene fluoride (PVDF) leads to high-quality acoustic performance, which can be tuned by the design of the embossed microstructures. The high sensitivity and large bandwidth for sound generation demonstrated by this acoustically active surface outperform previously reported thin-film loudspeakers using PVDF, PVDF copolymers, or voided charged polymers without microstructures. We further explore the directivity of this device and its use on a curved surface. In addition, high-fidelity sound perception is demonstrated by the surface, enabling its microphonic application for voice recording and speaker recognition. The versatility, high-quality acoustic performance, minimal form factor, and scalability of future production of this acoustically active surface can lead to broad industrial and commercial adoption for this technology.
我们展示了一种多功能的声学活性表面，它由一组能够辐射和传感声波的压电微结构组成。在聚偏二氟乙烯（PVDF）柔性压电片上一步压印而成的独立微结构阵列具有高质量的声学性能，可通过压印微结构的设计进行调节。这种声学活性表面所展现出的用于发声的高灵敏度和大带宽性能优于先前报道的使用PVDF、PVDF共聚物或无微结构的多孔带电聚合物的薄膜扬声器。我们进一步探究了该器件的指向性及其在曲面上的应用。此外，该表面还展示了高保真的声音感知能力，使其能够作为传声器应用于语音记录和扬声器识别。这种声学活性表面的多功能性、高质量声学性能、最小外形尺寸以及未来生产的可扩展性可促使该技术在工业和商业领域得到广泛应用。
