Active tuning of resonant lattice Kerker effect. (5th May 2022)

• Record Type: Journal Article
• Authors: Xiong, Lei; Ding, Hongwei; Lu, Yuanfu; Li, Guangyuan
• Is Part Of: Journal of physics. Volume 55:Number 18(2022)
• Publication Date: 2022-05-05
• Subjects: Kerker effect -- active tuning -- phase-change material -- metasurface -- surface lattice resonances -- Mie resonances; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/ac4ec5
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: The Kerker effect has been generalized in nanophotonics and meta-optics, and has recently been of great interest by relating it 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 Ge2 Se2 Te5 nanodisks. By changing the crystalline fraction, we show that the electric dipole surface lattice resonance (ED-SLR), the magnetic dipole resonance (MDR), and thus the resonant lattice Kerker effect are all red-shifted. We therefore realize the transition from the ED-SLR 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 transmissions 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.