Phase-change material enables active tuning of lattice Kerker effect

The Kerker effect is the elimination of backscattering in a magnetic sphere. It has been applied to such functions as scattering management and perfect transmission.

The lattice Kerker effect is one of the most interesting generalizations. By varying one of the array periods, the electric dipole surface lattice resonance (ED-SLR) of the array and the magnetic dipole resonance (MDR) of single nanoparticles can be spectrally overlapped, leading to strong suppression of reflection or backward scattering from the array as a whole.

A research group led by Dr. Li was able to realize active tuning of the lattice Kerker effect by introducing a meta surface composed of germanium-antimony-tellurium.

The study was published in a journal.

GST is a phase change material that can be switched between two different phases with many merits.

The transition from ED-SLR to the lattice Kerker effect was realized by the researchers. Since the ED-SLR and lattice Kerker effect correspond to near-unity and suppressed reflection, this transition leads to multilevel tuning of reflection, transmission and absorption with depths above 86 percent.

The team achieved broadband and multilevel tuning of transmission with a modulation depth of 87 percent over a broadband range of 588 nm.

Dr. Li said that the proposed GST metasurface featuring nonvolatile, rapid and reversible transition from ED-SLR to the lattice Kerker effect will find intriguing applications.

More information: Lei Xiong et al, Active Tuning of Resonant Lattice Kerker Effect, Journal of Physics D: Applied Physics (2022). DOI: 10.1088/1361-6463/ac4ec5 Journal information: Journal of Physics D: Applied Physics Citation: Phase-change material enables active tuning of lattice Kerker effect (2022, January 28) retrieved 28 January 2022 from https://phys.org/news/2022-01-phase-change-material-enables-tuning-lattice.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.