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Slow Surface Acoustic Waves via Lattice Optimization of a Phononic Crystal on a Chip
- Source :
- Physical Review Applied
-
Abstract
- Strategically reducing the speed of waves, which greatly improves both the energy density and information capacity of carrier signals in space, is a key enabling factor for signal-processing devices. Among these devices, especially in the prosperous wireless communication industry, surface acoustic wave (SAW) devices based on interdigital transducers (IDTs) currently hold an essential status. However, velocity reduction in traditional IDT-based SAW devices can be achieved only by using specific substrate materials that are generally of lower hardness, which inevitably leads to an increase in device size and less-optimal electromechanical coupling coefficients. Here, we demonstrate a technological means of realizing slow on-chip SAWs that is relevant for practical rf signal processing, gyrometers, sensing, and transduction. This method takes advantage of the gradual flattening of a Rayleigh-type dispersion band due to the spatial lattice evolution of a surface phononic crystal. In our experiment, the speed of an ultraslow SAW is measured to be approximately 200 m/s, which is even slower than the speed of sound in air and equivalent to 1/17.4 of the speed of the original Rayleigh waves in ${\mathrm{Li}\mathrm{Nb}\mathrm{O}}_{3}$. Such ultraslow SAWs may have promising applications in time-dependent SAW modulation, high-sensitivity SAW sensors, and SAW nonlinear even quantum-dynamic systems. Additionally, our technique can be similarly applied to a broad range of other two-dimensional or quasi-two-dimensional wave structures, e.g., in electronic, optical, acoustic, and thermal systems.
- Subjects :
- Materials science
business.industry
Surface acoustic wave
General Physics and Astronomy
02 engineering and technology
Acoustic wave
021001 nanoscience & nanotechnology
01 natural sciences
symbols.namesake
Transducer
Lattice (order)
Speed of sound
0103 physical sciences
Thermal
symbols
Optoelectronics
Radio frequency
Rayleigh wave
010306 general physics
0210 nano-technology
business
Subjects
Details
- Language :
- English
- ISSN :
- 23317019
- Volume :
- 14
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Physical Review Applied
- Accession number :
- edsair.doi.dedup.....9414ffd1e0440cfba72fcf9ad6f0b459
- Full Text :
- https://doi.org/10.1103/physrevapplied.14.064008