Role of Near-Field Interaction on Light Transport in Disordered Media

TL;DR

This paper investigates how near-field interactions influence light transport in disordered media, revealing their role in collective behavior, mode excitation, and potential for enhancing photonic device performance.

Contribution

It provides a theoretical analysis of near-field interactions in disordered photonic media, highlighting their effects on collective scattering and mode excitation, and explores ways to enhance these interactions.

Findings

NFI leads to stronger collective behavior involving more particles.

NFI widens the photonic pseudo-bandgap in disordered media.

NFI excites more weakly decayed longitudinal modes and increases local density of states.

Abstract

Understanding light-matter interaction in disordered photonic media allows people to manipulate light scattering and achieve exciting applications using seemingly scrambled media. As the concentration of scattering particles rises, they are inclined to step into near fields of each other in deep subwavelength scale. The fundamental physics involving the interplay between disorder and near-field interaction (NFI) is still not fully understood. We theoretically examine the role of NFI by analyzing the underlying multiple scattering mechanism. We find NFI leads to a stronger collective behavior involving more particles and widens the photonic pseudo-bandgap of disordered media. It also excites more weakly decayed longitudinal modes and results in higher local density of states. By introducing a sticky short-range order, we demonstrate the possibility of enhancing off-momentum-shell NFI of multiple scattering process. Our results have profound implications in understanding and harnessing nanoscale light-matter interaction for novel disordered photonic devices.