Study of Abnormal Group Velocities in Flexural Metamaterials.

ABSTRACT: Generally, it has been known that the optical branch of a simple one-dimensional periodic structure has a negative group velocity at the first Brillouin zone due to the band-folding effect. However, the optical branch of the flexural wave in one-dimensional periodic structure doesn't always have negative group velocity. The problem is that the condition whether the group velocity of the flexural optical branch is negative, positive or positive-negative has not been studied yet. In consequence, who try to achieve negative group velocity has suffered from trial-error process without an analytic guideline. In this paper, the analytic investigation for this abnormal behavior is carried out. In particular, we discovered that the group velocity of the optical branch in flexural metamaterials is

SUBMITTER: Park HW 

PROVIDER: S-EPMC6765006 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature