Double Reflections from corrugated surfaces
* Presenting author
Reflections of acoustic waves from corrugated surfaces are discussed. A proposal made by Yi-Fan Zhu for a metasurface model considers that each groove on a corrugated surface is analogous to each individual source in a line array, where the phase difference between sources is determined by the depth of each groove. Zhu's original proposal suggests using the phase gradient of the arrangement as a design parameter, and derives conditions for reflections without dispersion. In this paper, we expose the advantages of considering time-delay gradient instead of phase gradient. Also, designs that combine two corrugated surfaces interspersed with different gradients to produce double reflection patterns are presented. The angles and delays of both reflections can be selected independently.