Vertical jetting induced by shear horizontal leaky surface acoustic wave on 36° Y-X LiTaO3

Abstract

Shear horizontal surface acoustic waves (SH-SAWs) have been regarded as good candidates for liquid sensing applications but are inefficient in fluid manipulation due to a minimal fluid coupling between the fluid and acoustic waves. However, in this letter, a vertical jetting function was realized using the SH-SAW generated from a 36° Y-X LiTaO3 SAW device. The jetting of the droplet induced by the SH-SAWs was observed nearly along the vertical direction, and the aspect ratio of the liquid beam is proportional to the applied power before breaking up, which is dramatically different from those generated from the conventional Rayleigh SAWs. By conducting theoretical simulation and experimental investigation on the SH-SAWs systematically, we concluded that the wave/energy pressure dissipated into the sessile droplets causes this vertical ejection on the device surface.

Design and Implementation of 2.45 GHz Passive SAW Temperature Sensors with BPSK Coded RFID Configuration

“…Table 1 depicts the reflector design parameters of the SAW sensor. Moreover, FEM/BEM [ 38 , 39 ] was used to simulate the corresponding response of the sensor, which is shown in Figure 3 . Eight reflection peaks appear in the time window ranging from 1.11 to 1.21 µs, which stand for the reflections of SAW from those eight reflector gratings.…”

Computational and experimental analysis of droplet transportation/jetting behaviours driven by thin film surface acoustic waves

“…A schematic view of SAW propagation in both mediums is illustrated in Fig. 1(a Recently, droplet streaming [4,6,[14][15][16][17], transportation (sometimes called pumping) [18][19][20][21][22][23] and jetting [24][25][26][27][28] phenomena have been extensively investigated, and the droplet transportation and jetting have been realised on different substrates [19,21,[29][30][31]. There is a rapid development of numerical methods and computational resources in the last couple of decades, and several numerical studies of droplet behaviour driven by SAW have been carried out alongside the experimental works.…”

High-shear-velocity Composite Acoustic Materials of AlN/Diamond for Biological MEMS Devices

“…Some special piezoelectric crystals with a special cut can excite shear horizontal (SH) surface acoustic waves (SAWs), which are very good for liquid and biological SAW sensors. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10) SAW sensors are based on the mass loading effect. Therefore, a high SAW velocity will make SAW sensors work at a high frequency to have a high sensitivity.…”