Structural Luneburg lens for broadband cloaking and wave guiding.

Abstract:

:In this paper, we explore the concept of structural Luneburg lens (SLL) as a design framework for performing dynamic structural tailoring to obtain a structural wave cloak and a structural waveguide. The SLL is a graded refractive index lens, which is realized by using a variable thickness structure defined in a thin plate. Due to the thickness variation of the plate, the refractive index decreases radially from the centre to the outer surface of the lens. By taking advantage of the unique capabilities of SLL for flexural wave focusing and collimation, we develop a structural wave cloak and waveguide based on SLLs. The SLL design enables the integration of functional devices into thin-walled structures while preserving the structural characteristics. Analytical, numerical, and experimental studies are carried out to characterize the performance of the SLL cloak and the SLL waveguide. The results demonstrate that these SLL devices exhibit excellent performance for structural wave cloaking and waveguiding over a broadband operating frequency range.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zhao L,Yu M

doi

10.1038/s41598-020-71124-5

subject

Has Abstract

pub_date

2020-09-03 00:00:00

pages

14556

issue

1

issn

2045-2322

pii

10.1038/s41598-020-71124-5

journal_volume

10

pub_type

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