Dispersionless Manipulation of Reflected Acoustic Wavefront by Subwavelength Corrugated Surface.

ABSTRACT: Free controls of optic/acoustic waves for bending, focusing or steering the energy of wavefronts are highly desirable in many practical scenarios. However, the dispersive nature of the existing metamaterials/metasurfaces for wavefront manipulation necessarily results in limited bandwidth. Here, we propose the concept of dispersionless wavefront manipulation and report a theoretical, numerical and experimental work on the design of a reflective surface capable of controlling the acoustic wavefront arbitrarily without bandwidth limitation. Analytical analysis predicts the possibility to completely eliminate the frequency dependence with a specific gradient surface which can be implemented by designing a subwavelength corrugated surface. Experimental and numerical results, well consistent wit

SUBMITTER: Zhu YF 

PROVIDER: S-EPMC4468515 | biostudies-literature | 2015 Jun

REPOSITORIES: biostudies-literature