Near-infrared photonic phase-change properties of transition metal ditellurides
Author(s)
Li, Yifei; Singh, Akshay k; Krylyuk, Sergiy; Davydov, Albert; Jaramillo, Rafael
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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.
Date issued
2019-09Department
Massachusetts Institute of Technology. Department of Materials Science and EngineeringJournal
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
ISBN
9781510628632
9781510628649