Active Tuning of Resonant Lattice Kerker Effect

TL;DR

This paper demonstrates the first active tuning of the resonant lattice Kerker effect in nanostructures by adjusting the crystalline fraction of Ge2Se2Te5 nanodisks, enabling dynamic control of optical properties with high modulation depths.

Contribution

It introduces active control of the resonant lattice Kerker effect in periodic nanodisks, a previously unexplored area, using phase change material tuning.

Findings

Achieved red-shift of ED-LR, MDR, and Kerker effect through crystalline fraction adjustment.

Realized multilevel tuning of reflection, transmission, and absorption with over 86% modulation depth.

Demonstrated broadband transmission tuning with 87% modulation over 588 nm.

Abstract

The Kerker effect has been generalized in nanophotonics and meta-optics, and has recently been of great interest by relating to various fascinating functionalities such as scattering management and perfect transmission, reflection or absorption. One of the most interesting generalizations is the resonant lattice Kerker effect in periodic nanostructures. However, its active tuning has not been explored yet. Here, we report, for the first time, the active control of the resonant lattice Kerker effect in periodic Ge2Se2Te5 nanodisks. By changing the crystalline fraction, we show that the electric dipole lattice resonance (ED-LR), the magnetic dipole resonance (MDR), and thus the resonant lattice Kerker effect are all red-shifted. We therefore realize the transition from the ED-LR to the resonant lattice Kerker effect, which enables multilevel tuning of reflection, transmission and absorption with modulation depths above 86%. Taking advantage of the MDR redshifts, we also observe broadband and multilevel tuning of transmission with modulation depth of 87% over a broadband range of 588 nm. Our work establishes a new path for designing high-performance active nanophotonic devices.