Negative reflection of elastic guided waves in chaotic and random scattering media.

ABSTRACT: The propagation of waves in complex media can be harnessed either by taming the incident wave-field impinging on the medium or by forcing waves along desired paths through its careful design. These two alternative strategies have given rise to fascinating concepts such as time reversal or negative refraction. Here, we show how these two processes are intimately linked through the negative reflection phenomenon. A negative reflecting mirror converts a wave of positive phase velocity into its negative counterpart and vice versa. In this article, we experimentally demonstrate this phenomenon with elastic waves in a 2D billiard and in a disordered plate by means of laser interferometry. Despite the complexity of such configurations, the negatively reflected wave field focuses back towards the

SUBMITTER: Gerardin B 

PROVIDER: S-EPMC6376041 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature