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Double aperture focusing transducer for controlling microparticle motions in trapezoidal microchannels with surface acoustic waves
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Image of FIG. 1.
FIG. 1.

Illustration of the fluid pumping and particle manipulation concept. (a) A channel is fabricated on 128-YX-LN substrate fabricated with a double aperture elliptical focusing FE-SPUDT. An absorber is used to minimize radiation reflection. (b) The trapezoidal cross section channel prevents the formation of standing waves across the channel.

Image of FIG. 2.
FIG. 2.

(a) shows a 30.15 MHz elliptical focusing FE-SPUDT with an approximate eccentricity of 0.616, fabricated on a 128-YX-LN substrate. The channel was located along the central line of the transducer. The (b) image shows the cross-sectional shape of the trapezoidal channel. (c) The measured surface displacement magnitude for the area highlighted in (a). Due to the low eccentricity of this elliptical transducer, the focal point of these high intensity SAWs is located close to the middle of the channel (along direction).

Image of FIG. 3.
FIG. 3.

The magnitude of surface displacement perpendicular to the LN substrate surface when the SAW is generated from the (a) left, and (e) right transducer [the left and right transducers are labeled in Fig. 2(a)]. For the same section of the channel, (b)–(d) and (f)–(h) show a particle being pushed away from the high vibration magnitude wall to the low vibration wall when the excitation is on the left and right transducer, respectively. The arrow points in the direction the particles are moving. The videos were recorded at 500 frames per second and the measured electrical input power to the transducer was approximately 3 W.

Image of FIG. 4.
FIG. 4.

Experimental images of the particle streaklines for (a) 10, (b) 1, and (c) polystyrene microspheres in the trapezoidal cross section channel driven by the left transducer [see Fig. 2(a) for the channel cross section and left transducer]. As the particles’ size is reduced, the particle suspension becomes more evenly distributed. The measured electric input power to the transducer was approximately 5 W.


Generic image for table
Table I.

The estimated orders of magnitude for the forces exerted on a particle of diameter .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Double aperture focusing transducer for controlling microparticle motions in trapezoidal microchannels with surface acoustic waves