Giant field enhancement in high-index dielectric subwavelength particles

TL;DR

This paper demonstrates experimentally that high-index dielectric subwavelength particles can produce giant magnetic field enhancements near Mie resonances, significantly impacting nonlinear nanoscale photonics and various applications.

Contribution

The study provides the first experimental evidence of magnetic field enhancement in high-index dielectric particles at Mie resonances, supported by a comprehensive theoretical explanation.

Findings

Magnetic field intensity increases by over two orders of magnitude near resonances

Enhancement observed for both TE and TM polarizations

Results explain recent nonlinear optics phenomena in dielectric nanostructures

Abstract

Besides purely academic interest, giant field enhancement within subwavelength particles at light scattering of a plane electromagnetic wave is important for numerous applications ranging from telecommunications to medicine and biology. In this paper, we experimentally demonstrate the enhancement of the intensity of the magnetic field in a high-index dielectric cylinder at the proximity of the dipolar Mie resonances by more than two orders of magnitude for both the TE and TM polarizations of the incident wave. We present a complete theoretical explanation of the effect and show that the phenomenon is very general - it should be observed for any high-index particles. The results explain the huge enhancement of nonlinear effects observed recently in optics, suggesting a new landscape for all-dielectric nonlinear nanoscale photonics.