Nicola Francesco De, Tenuzzo Lorenzo Donato, Viola Ilenia, Zhang Rujing, Zhu Hongwei, Marcelli Augusto, Lupi Stefano
Graphene Labs, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy.
Department of Physics, University of Rome La Sapienza, P.le A. Moro 5, 00185, Rome, Italy.
Sci Rep. 2019 Sep 16;9(1):13386. doi: 10.1038/s41598-019-50082-7.
The ability to generate, amplify, mix, and modulate sound with no harmonic distortion in a passive opto-acoustic device would revolutionize the field of acoustics. The photo-thermo-acoustic (PTA) effect allows to transduce light into sound without any bulk electro-mechanically moving parts and electrical connections, as for conventional loudspeakers. Also, PTA devices can be integrated with standard silicon complementary metal-oxide semiconductor (CMOS) fabrication techniques. Here, we demonstrate that the ultimate PTA efficiency of graphene aerogels, depending on their particular thermal and optical properties, can be experimentally achieved by reducing their mass density. Furthermore, we illustrate that the aerogels behave as an omnidirectional pointsource throughout the audible range with no harmonic distortion. This research represents a breakthrough for audio-visual consumer technologies and it could pave the way to novel opto-acoustic sensing devices.
在无源光声器件中能够产生、放大、混合和调制声音且无谐波失真，这将彻底改变声学领域。光热声（PTA）效应能够将光转换为声音，而无需像传统扬声器那样使用任何大型机电运动部件和电气连接。此外，PTA器件可以与标准的硅互补金属氧化物半导体（CMOS）制造技术集成。在此，我们证明，取决于石墨烯气凝胶的特定热学和光学性质，通过降低其质量密度，可以通过实验实现其最终的PTA效率。此外，我们还表明，气凝胶在整个可听范围内表现为全向点声源，且无谐波失真。这项研究代表了视听消费技术的一项突破，它可能为新型光声传感设备铺平道路。
