# Dispersion assessment of three-dimensional Phononic Crystals using Laser Doppler Vibrometry

## TL;DR

This paper presents a validated laser Doppler vibrometry method for assessing the dispersion properties of three-dimensional phononic crystals, demonstrating good agreement with theoretical models and advancing experimental techniques in phononic metamaterials.

## Contribution

A novel laser Doppler vibrometry-based technique for dispersion analysis of 3D phononic crystals, validated against theoretical predictions.

## Key findings

- Good agreement between experimental and theoretical dispersion spectra.
- Effective laser Doppler vibrometry technique for phononic crystal analysis.
- Validated methodology enhances experimental capabilities in phononic metamaterials.

## Abstract

The elastodynamic response of finite 3D phononic structures is analyzed by means of comparing experimental findings obtained through a laser Doppler vibrometry-based methodology and theoretical computations performed with the Layer-Multiple-Scattering method. The recorded frequency-gap spectrum of the phononic slabs exhibited a good agreement of theory to experiment. Along these lines, a newly developed technique, based on laser doppler vibrometry, has been proposed and validated for the dispersion efficiency in 3D phononic metamaterials.