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. 2018 Aug 28;8:12980. doi: 10.1038/s41598-018-31365-x

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Normalized Transmission at the (a) ‘THROUGH’ and (b) ‘DROP’ ports with increasing degree of amorphization for a particular range of frequencies including a resonance peak at λ_read = 1529.1 nm. As the degree of amorphization increases, transmission at ‘THROUGH’ (‘DROP’) port decreases (increases) thus realizing negative (positive) integration action of the neuron. (c) and (d) Shows the top-view E-field distribution of a GST-embedded ring resonator for c-GST and a-GST showing higher field absorption for the former when the wave passes the GST region. (e) High contrast between c-GST and a-GST for the rectangular waveguide in the firing unit of the neuron.