Enhanced circular dichroism in Ge2Sb2Te5-loaded metasurface
Enhanced circular dichroism in Ge2Sb2Te5-loaded metasurface
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DOI：
10.1364/oe.466018
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Weiren Zhao
中科院分区：
文献类型：
--
作者：
Kangzhun Peng;Yujun Huang;Huan Jiang;Ying Cui;Hui Zhang;Yongyuan Jiang;Weiren Zhao
Circular dichroism (CD) is originally obtained from three-dimensional spiral structures by simultaneously exciting electric and magnetic resonances. To simplify construction, multilayer stacked asymmetric structures and the symmetric structures relying on oblique incidence are proposed for enhancing CD. Herein, we achieved the enhancement of dual-waveband CD by adding a Ge2Sb2Te5 (GST) layer on the top of a Z-shape gold array in a normally incident system. Benefited from the polarization selective excitations of electric and magnetic dipole resonances, the CD in a simple planar structure is immensely enhanced from near zero to 0.73 at 1.58 µm. Furthermore, the CD strengths is dynamically tuned by controlling the phase of GST. With the GST phase transition from amorphous (a-GST) to crystalline state (c-GST), CD magnitudes are switched by about 0.73 and 0.27 at dual wavebands respectively. The enhancement of CD by adding a layer on a simple planar array offers a new method for designing planar metasurfaces with strong chirality.
