Off-centered Double-slit Metamaterial for Elastic Wave Polarization Anomaly

Abstract

The polarization anomaly refers to the polarization transition from longitudinal to shear modes along an equi-frequency contour of the same branch, which occurs only in some anisotropic elastic media, but the lack of natural materials exhibiting desired anisotropy makes its utilization impossible for potential novel applications. In this paper, we present a unique, non-resonant type elastic metamaterial made of off-centered, double-slit unit cells. We show that its wave polarization characteristics that determine the desired anomalous polarization for a certain application are tailorable. As an application, a mode converting wedge that transforms pure longitudinal into pure shear modes is designed by the proposed metamaterial. The physics involved in the mode conversion is investigated by simulations and experiments.

Fractional Young double-slit numerical experiment with Gaussian wavepackets

“…So far, in addition to fabrication double-slit-grating 6 , others fields such as double-slit like interference by a pseudocereal metamaterial slab 7 , the double-slit experiment of surface Plasmon polaritons excited by mercury-lamp light source 8 , laser 9 , 10 , and single photons 11 , have been investigated. Besides, Young’s double nanoslit study with plasmon hybridization 12 , Plasmonic wave plate based on subwavelength nanoslits 13 , periodic metallic nano-slits 14 , three-dimensional quantum slit diffraction 15 , enhanced optical transmission of non-coaxial double-layer nano-slit with slanted sidewall arrays 16 , double-slit phenomena by using near field imaging technique 10 , 14 , off-centered double-slit metamaterial for elastic wave polarization anomaly 17 , interference of surface waves in a metallic nanoslit 18 , etc. have thus far been considered.…”

Mechanical Characterization of Compact Rolled‐up Microtubes Using In Situ Scanning Electron Microscopy Nanoindentation and Finite Element Analysis

“…Furthermore, based on the FIB/SEM and energy dispersive X‐ray (EDX) analysis of the compact SRMs, the existence of the FC layer (partially or totally) within the SRM windings is confirmed. The presence of the flexible polymeric FC layer [ 51 ] in the windings helps to increase the flexibility of the SRMs causing higher plastic deformation before breakage and improving the fatigue behavior of the SRMs.…”

A New Method for the Identification of Elastic Wave Propagation Mode and Polarization in Periodic Solid Media

“…This phenomenon has been harnessed by researchers to show the possibility of beaming or steering elastic waves in specific directions [24,25] and is also of interest for the inverse problem of non-destructively identifying damage by monitoring elastic energy flow [27,28]. Recently, researchers have also observed the appearance of polarization anomalies because of substructural heterogeneities [29][30][31], where the typically slower S-waves propagate faster than the P-waves.…”