文章基本信息

标题：Engineering the Phase Front of Light with Phase-Change Material Based Planar lenses
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作者：Yiguo Chen ; Xiong Li ; Yannick Sonnefraud 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep08660
出版社：Springer Nature
摘要：A novel hybrid planar lens is proposed to engineer the far-field focusing patterns. It consists of an array of slits which are filled with phase-change material Ge₂Sb₂Te₅ (GST). By varying the crystallization level of GST from 0% to 90%, the Fabry-Pérot resonance supported inside each slit can be spectrally shifted across the working wavelength at 1.55 µ m, which results in a transmitted electromagnetic phase modulation as large as 0.56 π . Based on this geometrically fixed platform, different phase fronts can be constructed spatially on the lens plane by assigning the designed GST crystallization levels to the corresponding slits, achieving various far-field focusing patterns. The present work offers a promising route to realize tunable nanophotonic components, which can be used in optical circuits and imaging applications.