Time-resolved dynamics of granular matter by random laser emission

TL;DR

This study explores the phase behavior of granular materials using laser emission to analyze their dynamics under mechanical oscillation, revealing phase distinctions and spectral properties, advancing understanding in photonics and granular physics.

Contribution

It presents the first phase diagram of granular matter obtained through laser emission, demonstrating how laser spectral analysis can distinguish phases and control light-matter interactions in granular systems.

Findings

Identified two distinct phases in granular matter via laser emission.

Showed the dependence of granular dynamics on oscillation frequency and amplitude.

Demonstrated the potential for controlling light-matter interactions in granular systems.

Abstract

Because of the huge commercial importance of granular systems, the second-most used material in industry after water, intersecting the industry in multiple trades, like pharmacy and agriculture, fundamental research on grain-like materials has received an increasing amount of attention in the last decades. In photonics, the applications of granular materials have been only marginally investigated. We report the first phase-diagram of a granular as obtained by laser emission. The dynamics of vertically-oscillated granular in a liquid solution in a three-dimensional container is investigated by employing its random laser emission. The granular motion is function of the frequency and amplitude of the mechanical solicitation, we show how the laser emission allows to distinguish two phases in the granular and analyze its spectral distribution. This constitutes a fundamental step in the field of granulars and gives a clear evidence of the possible control on light-matter interaction achievable in grain-like system.