The photoluminescence responses of two-dimensional atomic layers of MoS2 excited by surface acoustic wave device

In this study, the surface acoustic wave device combined with an oscillator circuit was used as the excitation platform to explore the photoluminescence responses of the two-dimensional atomic layers of MoS2. The MoS2 layers were prepared using the mechanical exfoliation method, and then transferred onto the SAW delay line area of the platform. Under the varied servo driving voltages of the excitation platform, various power intensities of the oscillator were obtained. It represented that the various energy levels of acoustic waves were propagated underneath the MoS2 layers. From the observation by multiphoton excitation microscopy, the excited fluorescent intensities of the MoS2 species were detected at various levels. Studies have proved that as the driving voltage of the oscillator increases, the interaction between the MoS2 species and the acoustic wave is also enhanced.