Open AccessStrongly tunable circular dichroism in gammadion chiral phase-change metamaterials
Author(s) -
Tun Cao,
Lei Zhang,
Robert E. Simpson,
Chen-Wei Wei,
Martin J Cryan
Publication year - 2013
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.027841
Subject(s) - metamaterial , materials science , optics , circular dichroism , planar , phase (matter) , wavelength , phase change , photonic metamaterial , optoelectronics , photothermal therapy , vibrational circular dichroism , physics , crystallography , chemistry , computer graphics (images) , engineering physics , quantum mechanics , computer science
A metal/phase-change material/metal tri-layer planar chiral metamaterial in the shape of a gammadion is numerically modelled. The chiral metamaterial is integrated with Ge2Sb2Te5 phase-change material (PCM) to accomplish a wide tuning range of the circular dichroism (CD) in the mid-infrared wavelength regime. A photothermal model is used to study the temporal variation of the temperature of the Ge2Sb2Te5 layer and to show the potential for fast switching the phase of Ge2Sb2Te5 under a low incident light intensity of 0.016mW/μm2.