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Proceedings Paper

Near-infrared photonic phase-change properties of transition metal ditellurides
Author(s): Yifei Li; Akshay Singh; Sergiy Krylyuk; Albert Davydov; R. Jaramillo
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Paper Abstract

We use the (Mo,W)Te2 system to explore the potential of transition metal dichalcogenides (TMDs) as phase-change materials for integrated photonics. We measure the complex optical constant of MoTe2 in both the 2H and 1T’ phases by spectroscopic ellipsometry. We find that both phases have large refractive index, which is good for confined lightmatter interaction volume. The change Δn between phases is of σ(1), which is large and comparable to established phase-change materials. However, both phases have large optical loss, which limits to figure of merit throughout the measured range. We further measure the NIR reflectivity of MoTe2 and Mo0.91W0.09Te2, in both the 2H and 1T’ phases. The data show that the strong optical contrast between the 2H and 1T’ structures persists even as the thermodynamic barrier between them is reduced by alloying. This bodes well for alloy design of phase-change materials.

Paper Details

Date Published: 9 September 2019
PDF: 8 pages
Proc. SPIE 11085, Low-Dimensional Materials and Devices 2019, 110850T (9 September 2019); doi: 10.1117/12.2532602
Show Author Affiliations
Yifei Li, Massachusetts Institute of Technology (United States)
Akshay Singh, Massachusetts Institute of Technology (United States)
Sergiy Krylyuk, National Institute of Standards and Technology (United States)
Theiss Research (United States)
Albert Davydov, National Institute of Standards and Technology (United States)
R. Jaramillo, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 11085:
Low-Dimensional Materials and Devices 2019
Nobuhiko P. Kobayashi; A. Alec Talin; Albert V. Davydov, Editor(s)

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