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. 2019 Jul 10;9(7):993. doi: 10.3390/nano9070993

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The light field distribution of metalens M₃. The red profile and green profile indicate the 1.55 μm and 1.31 μm light respectively. (a) The GST in both sections are in amorphous state. (b) The GST in section A stays in amorphous state but the GST in section B stays in crystalline state. (c) The GST in section A stays in crystalline state but the GST in section B stays in amorphous state. (d) The GST in both sections are in crystalline state.