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Modulation of acoustic self-accelerating beams with tunable curved metasurfaces
- Source :
- Applied Physics Letters. 118:023503
- Publication Year :
- 2021
- Publisher :
- AIP Publishing, 2021.
-
Abstract
- Self-accelerating beams have applications in optic and acoustic fields due to their peculiar properties. As a promising artificial two-dimensional metamaterial, a metasurface can be used as the generator of self-accelerating beams. However, restricted by the generalized Snell's law, most research hotspots focus on flat metasurfaces. In this Letter, the generalized Snell's law on an arbitrary curved reflective surface is discussed. Then, the phase profile for the self-accelerating beams generated from the curved reflective surface is derived based on the caustic theory. The metasurface consisting of the tunable spiral path units is constructed, and numerical and experimental validations are performed. The methodology developed in the present letter extends the applications of the self-accelerating beams.
- Subjects :
- 010302 applied physics
Physics
Surface (mathematics)
Physics and Astronomy (miscellaneous)
business.industry
Phase (waves)
Physics::Optics
Metamaterial
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Generator (circuit theory)
Optics
Modulation
0103 physical sciences
Physics::Accelerator Physics
Caustic (optics)
Spiral (railway)
0210 nano-technology
Focus (optics)
business
Subjects
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 118
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi...........14af4934afc2d1af43dc049a9f00c80f