Polarization Dependent Enhancement of Magnetic Dipolar Emission with Silicon Nanodimers

TL;DR

This study demonstrates how silicon nanodimers can selectively enhance magnetic and electric dipolar emissions of Eu complexes through polarization-dependent resonances, enabling tailored light emission at the nanoscale.

Contribution

It introduces a novel approach using silicon nanodimers to control dipolar emission via polarization-dependent magnetic and electric resonances.

Findings

Polarization-dependent emission enhancement observed in Eu3+ complexes.

Finite element simulations optimized nanostructure parameters.

Fabrication of hybrid nanostructures with targeted emission control.

Abstract

Eu(TTA)3 complexes are used as an emission source in the presence of high refractive index dielectric nanostructures. These nanostructures support Mie-type resonances that modify the local density of optical states. Specifically, the silicon dimer provides polarization-dependent electric and magnetic field enhancement in the dimer gap to modify the electric dipolar and magnetic dipolar emissions of the Eu3+ at 610 nm and 590 nm, respectively. Finite element method simulations are used to determine the optimal parameters for the sample and to demonstrate the polarization-dependent emission enhancement of dipolar emitters in the gap. A two-step electron beam lithography process is used to fabricate the hybrid nanoscopic structures, with a Eu3+ doped electron beam resist located only in the center of the dimer. The results demonstrate the potential of these nanostructures to selectively tailor the emission of the two distinct dipolar transitions by engineering the resonant nanostructures. Our work highlights the potential of magnetic light-matter interactions as a novel degree of freedom.