Strongly tunable circular dichroism in gammadion chiral phase-change metamaterials | Zendy

Tun Cao | Zendy; Lei Zhang | Zendy; Robert E. Simpson | Zendy; ChenWei Wei | Zendy; Martin J. Cryan | Zendy

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Strongly tunable circular dichroism in gammadion chiral phase-change metamaterials

Author(s) -

Tun Cao,

Lei Zhang,

Robert E. Simpson,

ChenWei 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.

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