Tuning of Classical Electromagnetically Induced Reflectance in Babinet Chalcogenide Metamaterials

Kuan Liu; Yang Li; Kairong Qin; Tun Cao

doi:10.1016/j.isci.2020.101367

Tuning of Classical Electromagnetically Induced Reflectance in Babinet Chalcogenide Metamaterials

iScience. 2020 Aug 21;23(8):101367. doi: 10.1016/j.isci.2020.101367. Epub 2020 Jul 16.

Authors

Kuan Liu¹, Yang Li¹, Kairong Qin¹, Tun Cao²

Affiliations

¹ School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China.
² School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China. Electronic address: caotun1806@dlut.edu.cn.

Abstract

Metamaterials analog of electromagnetically induced reflectance (EIR) has attracted intense attentions since they can provide various applications for novel photonic devices such as optical detectors with a high sensitivity and slow-light devices with a low loss. The development of dynamic photonic devices desires a tunable EIR feature in metamaterials. However, most metamaterials-induced EIR is not spectrally controllable particularly for the near-infrared (NIR) region. Herein, a tuning of EIR is illustrated in Babinet chalcogenide metamaterials in the NIR region. The EIR response is created by weak hybridization of two dipolar (bright) modes of the paired Au slots. Such a mode interference can be engineered through non-volatile phase transition to the refractive index of the Ge₂Sb₂Te₅ (GST), resulting in an active controlling of the reflection window. A 15% spectral tuning of the reflectance peak is observed experimentally in the NIR region as switching the GST state between amorphous and crystalline.

Keywords: Electromagnetics; Materials Design; Metamaterials.