Near-infrared photonic phase-change properties of transition metal ditellurides
Name
(Mo,W)Te2 phase change SPIE v6.4.pdf
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1.17 MB
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Adobe PDF
Checksum (MD5)
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Author(s)
Li, Yifei
Singh, Akshay k
Krylyuk, Sergiy
Davydov, Albert
Jaramillo, Rafael
Date Issued
September 2019
Journal
Low-Dimensional Materials and Devices 2019
Publisher
Society of Photo-Optical Instrumentation Engineers (SPIE)
Citation
Li, Yifei et al. "Near-infrared photonic phase-change properties of transition metal ditellurides." Low-Dimensional Materials and Devices 2019, SPIE Nanoscience + Engineering, San Diego, California, United States, Society of Photo-Optical Instrumentation Engineers (SPIE), September 2019. © 2019 SPIE
Version
Author's final manuscript
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.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1117/12.2532602
