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Frequency conversion through nonlinear mixing in acoustic waves
- Source :
- Journal of Applied Physics. 128:064105
- Publication Year :
- 2020
- Publisher :
- AIP Publishing, 2020.
-
Abstract
- Frequency conversion is an essential tool in modern communication devices. Traditionally, frequency conversion is achieved through parametric coupling via nonlinear inductors or capacitors whose reactance is modulated by a carrier wave. In this study, nonlinear acoustic Lamb wave devices are explored for simultaneous signal filtering and frequency conversion. Three sets of interdigitated transducers are fabricated on a piezoelectric aluminum nitride (AlN) thin film to provide a carrier wave, a low-power signal wave, and to receive a frequency converted mixed wave. Two devices are fabricated and tested to demonstrate frequency upconversion and downconversion by utilizing mechanical nonlinearity of AlN, and the results are compared to a nonlinear circuit model. The nonlinear circuit model is used to link experimentally observed phenomenon to the acoustic material's intrinsic nonlinearity. The nonlinearity of AlN reaches a maximum of 2.8% with a carrier wave power at 28 dBm. An analytical model is used to predict device performance along with physical dimensions. These analytical results show that nonlinear acoustic mixers and filters can approach sub-millimeter sizes, which is orders-of-magnitude smaller than conventional structures using nonlinear inductors and capacitors.
- Subjects :
- 010302 applied physics
Coupling
Materials science
Acoustics
General Physics and Astronomy
02 engineering and technology
Acoustic wave
021001 nanoscience & nanotechnology
Inductor
01 natural sciences
Piezoelectricity
Computer Science::Other
law.invention
Condensed Matter::Materials Science
Nonlinear system
Capacitor
Lamb waves
Transducer
law
0103 physical sciences
0210 nano-technology
Subjects
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 128
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi...........4065b08c24f3c70d2c9930b4b73a620a