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Chin. Opt. Lett.
 Home  List of Issues    Issue 05 , Vol. 16 , 2018    10.3788/COL201816.050009

Deflection angle switching with a metasurface based on phase-change nanorods [Invited]
Chulsoo Choi1, Sun-Je Kim1, Jeong-Geun Yun1, Jangwoon Sung1, Seung-Yeol Lee2, and Byoungho Lee1
1 School of Electrical and Computer Engineering and Inter-University Semiconductor Research Center, [Seoul National University], Gwanak-Gu Gwanakro 1 , Seoul 08826, South Korea
2 School of Electronics Engineering, [Kyungpook National University], Daegu 41566, South Korea

Chin. Opt. Lett., 2018, 16(05): pp.050009

Keywords(OCIS Code): 160.3918  220.1080  250.6715  

We propose the active metasurface using phase-change material Ge2Sb2Te5 (GST), which has two distinct phases so called amorphous and crystalline phases, for an ultrathin light path switching device. By arranging multiple anisotropic GST nanorods, the gradient metasurface, which has opposite directions of phase gradients at the two distinct phases of GST, is demonstrated theoretically and numerically. As a result, in the case of normal incidence of circularly polarized light at the wavelength of 1650 nm, the cross-polarized light deflects to ?55.6° at the amorphous phase and +55.6° at the crystalline phase with the signal-to-noise ratio above 10 dB.

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Posted online:2018/4/20

Get Citation: Chulsoo Choi, Sun-Je Kim, Jeong-Geun Yun, Jangwoon Sung, Seung-Yeol Lee, and Byoungho Lee, "Deflection angle switching with a metasurface based on phase-change nanorods [Invited]," Chin. Opt. Lett. 16(05), 050009(2018)

Note: This work was supported by the Center for Advanced Meta-Materials (CAMM) funded by the Ministry of Science, ICT and Future Planning as Global Frontier Project (Grant No. CAMM-2014M3A6B3063710) and also by the National Research Foundation of Korea (NRF) grant funded by the Korea government Ministry of Science and ICT (Grant No. 2017R1A4A1015565).


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