Nature Sub Series: Ultimate photothermal effect graphene airgel

Nature Sub Series: graphene airgel ultimate photothermal effect, the final proof of the graphene airgel light thermoacoustic (PTA) efficiency, depending on their particular thermal and optical properties, can be experimentally by reducing its mass density achieve.

About results

is generated, amplified sound in a passive optical device, modulated sound mixing and harmonic distortion without the ability to completely change the acoustic field. Like the conventional speaker, light thermoacoustic (PTA) allow the conversion of light to effect sound, without any moving parts and a large amount of organic electrically connected. Also, PTA complementary metal oxide semiconductor device may be a standard silicon (CMOS) manufacturing technology integration. Here, we demonstrate the efficiency of the final PTA graphene airgel, depending on their particular thermal, and optical properties can be achieved experimentally by lowering its mass density. In addition, we show the performance of aerogels over the entire audible range omnidirectional source, no harmonic distortion.

Photo Introduction

photothermal effect graphene airgel
FIG. 2, the graphene airgel PTA density-dependent frequency response.
FIG. 3, the harmonic analysis of acoustic emission graphene PTA airgel.
FIG 4, the acoustic directivity of the photothermal graphene airgel speakers.


In summary, the graphene can be used as airgel PTA loudspeaker having omnidirectional emission and no harmonic distortion in the audible range. we proved the efficiency of this theoretical limit of speakers can be achieved by adjusting their mass density. Thus, the graphene may be provided a commercial organic airgel speaker and headphones generally effective alternative to high-fidelity speakers, so long as the illuminating light spot is sufficiently large. In addition, we believe that PTA speaker may pave the way for new photoacoustic sensing devices and metering applications.