Implementation of pulse timing discriminator functionality into a GeSbTe/GeCuTe double layer structure

Ryota Akimoto, Hiroaki Handa, Satoshi Shindo, Yuji Sutou, Masashi Kuwahara, Makoto Naruse, Toshiharu Saiki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The functionality of a pulse timing discriminator, which is commonly required in optical communication systems and artificial neuromorphic engineering, was implemented into chalcogenide phase-change materials. GeSbTe (GST) and GeCuTe (GCT), which exhibit opposite refractive index behavior in their respective crystalline and amorphous phases, were employed. A GST/GCT double layer enabled the order of arrival of two counter-propagating femtosecond pulses to be encoded as a difference in the degree of amorphization of the GCT layer, i.e., either a brighter or darker contrast of the amorphized area with respect to the crystalline background. Nonthermal ultrafast amorphization contributed to a picosecond time resolution in the discrimination of the pulse arrival order.

Original languageEnglish
Pages (from-to)26825-26831
Number of pages7
JournalOptics Express
Volume25
Issue number22
DOIs
Publication statusPublished - 2017 Oct 30

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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