High-frequency surface acoustic waves excited on thin-oriented LiNbO/sub 3/ single-crystal layers transferred onto silicon

2007 ◽  
Vol 54 (4) ◽  
pp. 870-876 ◽  
Author(s):  
T. Pastureaud ◽  
M. Solal ◽  
B. Biasse ◽  
B. Aspar ◽  
J.-B. Briot ◽  
...  
Keyword(s):  
Single Crystal ◽  
Acoustic Waves ◽  
High Frequency ◽  
Surface Acoustic Waves

Micro-Drop Mixer Driven by Standing Surface Acoustic Waves (SSAW)

2012 ◽  
Vol 629 ◽  
pp. 521-523
Author(s):  
Bao Gang Miao ◽  
Chao Hui Wang ◽  
Teng Fei Zheng ◽  
Qun Ming Zhang ◽  
Zhuang De Jiang
Keyword(s):  
Lithium Niobate ◽  
Single Crystal ◽  
Surface Waves ◽  
Acoustic Waves ◽  
High Frequency ◽  
Surface Acoustic Waves ◽  
Mixing Process ◽  
Lab On Chip ◽  
Digital Transducers ◽  
On Chip

High-frequency surface acoustic waves (SAW) were generated and transmitted along single-crystal lithium niobate (LiNbO3). The standing surface waves (SSAW) formed between two parallel inter-digital transducers (IDTs) on a LiNbO3 substrate, were employed to drive the micro-drop mixer. An SSAW device was designed, micro-machined and tested. When an AC signal with the frequency of 61.4MHz was applied to the IDTs, vortex appeared in the drop consisted of two incompatible liquid (ink and glycerol). The evolution of the vortex was recorded in this work. With the evolution of the vortex, mixing process of two incompatible liquid has been demonstrated. The mixer is of significant relevance for many bio-technological applications and in particular for lab-on-chip. While the experimental liquids were mutually incompatible, the ink could only be divided into smaller drops.

LEAKY SURFACE ACOUSTIC WAVES IN SINGLE-CRYSTAL AlN SUBSTRATE

2004 ◽  
Vol 14 (03) ◽  
pp. 837-846 ◽  
Author(s):  
GANG BU ◽  
DAUMANTAS CIPLYS ◽  
MICHAEL S. SHUR ◽  
LEO J. SCHOWALTER ◽  
SANDRA B. SCHUJMAN ◽  
...  
Keyword(s):  
Single Crystal ◽  
Acoustic Waves ◽  
Electromechanical Coupling ◽  
Surface Acoustic Waves ◽  
Propagation Direction ◽  
Electromechanical Coupling Coefficient ◽  
Coupling Coefficients ◽  
Leaky Waves ◽  
Temperature Coefficient Of Frequency ◽  
Piezoelectric Constants

We report on the velocity V and the electromechanical coupling coefficient K2 of the first and the second leaky surface acoustic waves in various propagation directions in the a-plane AlN single-crystal. For c-propagation direction, the second leaky wave exhibited the velocity of 11016 m/s and K2 of 0.45%. For this direction, the temperature coefficient of frequency was found to be -30 ppm/°C. A near match of the velocities of the plane and leaky waves in the a-plane AlN allowed us to establish analytical relationships between the piezoelectric and elastic constants. A full set of elastic and piezoelectric constants of AlN has been evaluated by fitting the measured and calculated dependencies of velocities and electromechanical coupling coefficients on the propagation direction for both Rayleigh and leaky waves.

A low-power droplet manipulator employing high-frequency surface acoustic waves

2009 ◽  
Vol 92 (4) ◽  
pp. 49-55
Author(s):  
Tsutomu Sasaki ◽  
Yasutomo Tanaka ◽  
Tatsuya Omori ◽  
Ken-Ya Hashimoto ◽  
Masatsune Yamaguchi
Keyword(s):  
Low Power ◽  
Acoustic Waves ◽  
High Frequency ◽  
Surface Acoustic Waves

Generating Near-THz Surface Acoustic Waves Using Picosecond Ultrasonics

2009 ◽  
Author(s):  
J. H. Lee ◽  
J. S. Sadhu ◽  
S. Sinha
Keyword(s):  
Rise Time ◽  
Acoustic Waves ◽  
High Frequency ◽  
Short Pulse ◽  
Surface Acoustic Waves ◽  
Grating Period ◽  
Critical Parameters ◽  
Generation Process ◽  
Short Pulse Laser ◽  
Substrate Properties

We present here a technique to generate high frequency SAW in non-piezoelectric substrate with nanostructure grating of period less than 100 nm fabricated on it. A short pulse laser (with rise time less than 100fs) incident on this structure creates a periodic thermal stress due to the differential absorption in the substrate and the grating. We show that this stress sets up a surface acoustic wave on the substrate that can be detected optically. Modeling the generation process and analysis of SAW spectrum reveals the critical parameters to be controlled for obtaining SAW of high frequency. We show that the grating period less than 50 nm, a laser pulse of rise time less than 100fs and substrate properties like high optical absorption and high Rayleigh velocity are necessary for generating surface acoustic waves in near-THz range. This work provides quantitative guidelines on the design of near THz phononics.

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