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Optical response of phase change material for metasurface (Conference Presentation)
Author(s): Cheng Hung Chu; Ming Lun Tseng; Jie Chen; Hui Jun Wu; Hsiang-Chu Wang; Ting-Yu Chen; Din Ping Tsai
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Paper Abstract

Phase change materials are used as the recording layer in optical data storage, electronic storage and nanolithography due to the enormous physical difference between crystalline and amorphous states. In recent years, they are demonstrated to exploit in various tunable plasmonic devices, such as perfect absorber, planar lenses, plasmonic antenna, Fano resonance and so on. However, in these researches, the phase change material merely plays a role as a refractive index switchable substrate. In this paper, we study the intrinsic optical properties of phase change material Ge2Sb2Te5 (GST) in the near-infrared regime. A clear insight into the dipole resonance system of GST is provided. The reflection phase retardation and intensity of each unit cells depending on the phase state and geometry are estimated. Further, we introduce the concept of reconfigurable gradient metasurface, which has different anomalous reflection angles by switching the combination of nanorods with different geometries and phase states. The research has great potential in the area of tunable metamaterial device (metadevice) in the future.

Paper Details

Date Published: 2 November 2016
PDF: 1 pages
Proc. SPIE 9959, Optical Data Storage 2016, 99590E (2 November 2016); doi: 10.1117/12.2237224
Show Author Affiliations
Cheng Hung Chu, Academia Sinica (Taiwan)
Ming Lun Tseng, National Taiwan Univ. (Taiwan)
Jie Chen, National Taiwan Univ. (Taiwan)
Hui Jun Wu, National Taiwan Univ. (Taiwan)
Hsiang-Chu Wang, National Taiwan Univ. (Taiwan)
Ting-Yu Chen, National Taiwan Univ. (Taiwan)
Din Ping Tsai, Academia Sinica (Taiwan)
National Taiwan Univ. (Taiwan)


Published in SPIE Proceedings Vol. 9959:
Optical Data Storage 2016
Ryuichi Katayama; Thomas D. Milster, Editor(s)

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