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Design of broadband impedance-matching Bessel lens with acoustic metamaterials
- Source :
- Journal of Applied Physics. 126:065103
- Publication Year :
- 2019
- Publisher :
- AIP Publishing, 2019.
-
Abstract
- In this paper, a gradient-index lens is designed to implement an acoustic Bessel beam. Here, the wave from the point source is reshaped to the Bessel beam with the energy concentrated near the axial direction and almost no divergence. The two-dimensional distribution of the gradient refractive index is obtained based on the analysis of the impedance matching theory. The interface reflection is reduced significantly due to the impedance matching with air. The effect of the acoustic Bessel lens is found to work in a broadband with the use of the subwavelength unit cell and the finite-element simulations. Our results may provide the potential applications for medical ultrasound imaging and signal detection.In this paper, a gradient-index lens is designed to implement an acoustic Bessel beam. Here, the wave from the point source is reshaped to the Bessel beam with the energy concentrated near the axial direction and almost no divergence. The two-dimensional distribution of the gradient refractive index is obtained based on the analysis of the impedance matching theory. The interface reflection is reduced significantly due to the impedance matching with air. The effect of the acoustic Bessel lens is found to work in a broadband with the use of the subwavelength unit cell and the finite-element simulations. Our results may provide the potential applications for medical ultrasound imaging and signal detection.
- Subjects :
- 010302 applied physics
Physics
business.industry
Impedance matching
Physics::Optics
General Physics and Astronomy
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Signal
law.invention
Lens (optics)
symbols.namesake
Optics
law
0103 physical sciences
symbols
Reflection (physics)
Bessel beam
Physics::Accelerator Physics
0210 nano-technology
business
Refractive index
Bessel function
Energy (signal processing)
Subjects
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 126
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi...........e3e135d6571cefc914329ef600002904