Near-infrared photonic phase-change properties of transition metal ditellurides
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 refrac...
| Main Authors: | , , , , |
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| Format: | Article |
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Society of Photo-Optical Instrumentation Engineers (SPIE)
2020
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| Online Access: | https://hdl.handle.net/1721.1/126221 |
| _version_ | 1826195752971403264 |
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| author | Li, Yifei Singh, Akshay k Krylyuk, Sergiy Davydov, Albert Jaramillo, Rafael |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Li, Yifei Singh, Akshay k Krylyuk, Sergiy Davydov, Albert Jaramillo, Rafael |
| author_sort | Li, Yifei |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T10:14:54Z |
| format | Article |
| id | mit-1721.1/126221 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T10:14:54Z |
| publishDate | 2020 |
| publisher | Society of Photo-Optical Instrumentation Engineers (SPIE) |
| record_format | dspace |
| spelling | mit-1721.1/1262212022-09-26T16:43:54Z Near-infrared photonic phase-change properties of transition metal ditellurides Li, Yifei Singh, Akshay k Krylyuk, Sergiy Davydov, Albert Jaramillo, Rafael Massachusetts Institute of Technology. Department of Materials Science and Engineering 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. 2020-07-16T15:12:13Z 2020-07-16T15:12:13Z 2019-09 Article http://purl.org/eprint/type/ConferencePaper 9781510628632 9781510628649 https://hdl.handle.net/1721.1/126221 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 http://dx.doi.org/10.1117/12.2532602 Low-Dimensional Materials and Devices 2019 Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Society of Photo-Optical Instrumentation Engineers (SPIE) Prof. Jaramillo |
| spellingShingle | Li, Yifei Singh, Akshay k Krylyuk, Sergiy Davydov, Albert Jaramillo, Rafael Near-infrared photonic phase-change properties of transition metal ditellurides |
| title | Near-infrared photonic phase-change properties of transition metal ditellurides |
| title_full | Near-infrared photonic phase-change properties of transition metal ditellurides |
| title_fullStr | Near-infrared photonic phase-change properties of transition metal ditellurides |
| title_full_unstemmed | Near-infrared photonic phase-change properties of transition metal ditellurides |
| title_short | Near-infrared photonic phase-change properties of transition metal ditellurides |
| title_sort | near infrared photonic phase change properties of transition metal ditellurides |
| url | https://hdl.handle.net/1721.1/126221 |
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