Near-infrared optical properties and proposed phase-change usefulness of transition metal disulfides
Name
1.5124224.pdf
Description
Published version
Size
1.45 MB
Format
Adobe PDF
Checksum (MD5)
358cef49d2c0a9777311325984e67d14
Author(s)
Singh, Akshay k
Li, Yifei
Fodor, Balint
Makai, Laszlo
Zhou, Jian
Xu, Haowei
Akey, Austin J
Li, Ju
Jaramillo, Rafael
Date Issued
October 2019
Journal
Applied Physics Letters
Publisher
AIP Publishing
Citation
Singh, Akshay et al. "Near-infrared optical properties and proposed phase-change usefulness of transition metal disulfides." Applied Physics Letters 115, 16 (October 2019):161902 © 2019 Author(s)
Version
Final published version
Abstract
The development of photonic integrated circuits would benefit from a wider selection of materials that can strongly control near-infrared (NIR) light. Transition metal dichalcogenides (TMDs) have been explored extensively for visible spectrum optoelectronics; the NIR properties of these layered materials have been less-studied. The measurement of optical constants is the foremost step to qualify TMDs for use in NIR photonics. Here, we measure the complex optical constants for select sulfide TMDs (bulk crystals of MoS2, TiS2, and ZrS2) via spectroscopic ellipsometry in the visible-to-NIR range. We find that the presence of native oxide layers (measured by transmission electron microscopy) significantly modifies the observed optical constants and need to be modeled to extract actual optical constants. We support our measurements with density functional theory calculations and further predict large refractive index contrast between different phases. We further propose that TMDs could find use as photonic phase-change materials, by designing alloys that are thermodynamically adjacent to phase boundaries between competing crystal structures, to realize martensitic (i.e., displacive, order-order) switching.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/1.5124224
