Chinese Optics Letters, 2018, 16 (5): 050009, Published Online: Jul. 18, 2018  

Deflection angle switching with a metasurface based on phase-change nanorods [Invited] Download: 825次

Author Affiliations
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
Abstract
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.

Chulsoo Choi, Sun-Je Kim, Jeong-Geun Yun, Jangwoon Sung, Seoul-Yeol Lee, Byoungho Lee. Deflection angle switching with a metasurface based on phase-change nanorods [Invited][J]. Chinese Optics Letters, 2018, 16(5): 050009.

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