Strongly tunable circular dichroism in gammadion chiral phase-change metamaterials

Tun Cao, Lei Zhang, Robert E. Simpson, Chenwei Wei, Martin J. Cryan

Research output: Contribution to journalArticle (Academic Journal)peer-review

95 Citations (Scopus)


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 Ge2Sb2Te 5 under a low incident light intensity of 0.016mW/μm2.

Original languageEnglish
Pages (from-to)27841-27851
Number of pages11
JournalOptics Express
Issue number23
Publication statusPublished - 18 Nov 2013


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