scholarly journals Periodically Poled Acoustic Wave-Guide and Transducers for Radio-Frequency Applications

10.5772/18584 ◽  
2011 ◽  
Author(s):  
Sylvain Ballandras ◽  
Emilie Courjon ◽  
Florent Bassignot ◽  
Gwenn Ulliac ◽  
Jerome Hauden ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Radio Frequency ◽  
Wave Guide ◽  
Periodically Poled

Droplets Transportation on a Piezoelectric Substrate with an Obstacle

2013 ◽  
Vol 339 ◽  
pp. 104-108
Author(s):  
Xiang Ting Fu ◽  
Yan Zha ◽  
An Liang Zhang
Keyword(s):  
Acoustic Wave ◽  
Radio Frequency ◽  
Surface Acoustic Wave ◽  
Acoustic Streaming ◽  
Microfluidic System ◽  
Frequency Signal ◽  
Radio Frequency Signal ◽  
Generate Surface ◽  
Interdigital Transducer ◽  
Piezoelectric Substrate

A method for a droplet transportation by jumping a obstacle on piezoelectric substrate is presented, and a device for the droplet transportation is implemented on a 128° yx-LiNbO3 piezoelectric substrate. An interdigital transducer and a reflector are fabricated on the piezoelectric substrate using microelectric technology. Hydrophobic film is coated on the area free of electrodes and a polydimethylsilicone obstacle is mounted on it. A radio frequency signal amplified by a power amplifier is applied to the interdigital transducer to generate surface acoustic wave. When the surface acoustic wave meets with the droplet on the piezoelectric substrate during transportation, part of acoustic wave enegy is radiated into the droplet, leading to internal acoustic streaming. Once the radio frequency signal with appropriate amplitude is suddenly decreased, part of the droplet will jump the obstacle due to interial force. Red dye solution drops are demonstrated for transportation experiments. Results show that a droplet can be transported from one side to another of the obstacle on piezoelectric substrate by help of surface acoustic wave. The presented method is helpful for microfluidic system on a piezoelectric substrate.

Resonance modes of magnetically generated surface waves in acoustic wave guide systems

2010 ◽  
Vol 322 (9-12) ◽  
pp. 1628-1630
Author(s):  
G. Scheerschmidt ◽  
K.J. Kirk ◽  
G. McRobbie
Keyword(s):  
Acoustic Wave ◽  
Surface Waves ◽  
Wave Guide ◽  
Resonance Modes
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