Related Experiment Video
Updated: Jun 29, 2026
12:14
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
22.6K
A flat acoustic lens to generate a Bessel-like beam
Zheng Xu1, Wei Xu2, Menglu Qian1
1Institute of Acoustics, Tongji University, Shanghai 200092, China.
Ultrasonics
|May 16, 2017
Summary
Researchers developed a flat acoustic lens that transforms sound waves into Bessel-like beams. This acoustic lens enhances sound intensity and shows potential for acoustic source localization.
Area of Science:
- Acoustics
- Wave Optics
- Metamaterials
Background:
- Transforming acoustic beams is crucial for applications like imaging and sensing.
- Conventional methods often involve bulky or complex setups.
- Flat acoustic lenses offer a compact and efficient alternative.
Purpose of the Study:
- To design and experimentally validate a flat acoustic lens capable of generating Bessel-like beams.
- To investigate the acoustic wave propagation through the lens's periodical structure.
- To assess the lens's performance in enhancing acoustic intensity and its potential for source localization.
Main Methods:
- Fabrication of a flat acoustic lens with a periodical structure.
- Experimental observation of acoustic wave propagation using Schlieren imaging.
- Analysis of pressure distribution and comparison with Bessel function predictions.
- Numerical simulations using the finite-element method to evaluate beam directivity and intensity.
Main Results:
- The flat acoustic lens successfully transformed a divergent beam into a Bessel-like beam.
- Experimental results showed good agreement between the observed pressure distribution and the Bessel function.
- Finite-element method simulations confirmed a significant increase in transmitted acoustic intensity at the central axis with the lens.
- The study explored the lens's effectiveness in acoustic source localization.
Conclusions:
- The developed flat acoustic lens is effective in generating Bessel-like beams.
- The lens demonstrates enhanced acoustic intensity transmission.
- The flat acoustic lens shows promise for applications in acoustic sensing and source localization.
Related Concept Videos
01:16Focusing of Light in the Eye
Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
01:20Bessel Function of Order Zero
A common physical example of wave propagation with radial symmetry is the ripple formed when a stone is dropped into a still pond. The disturbance originates at a central point and travels outward as a circular wave. As the radius of the wavefront increases, the same initial energy is distributed along a progressively larger circumference. Consequently, the amplitude, or height, of the wave decreases with distance from the center. This decay behavior cannot be captured by simple sine or cosine...