Laser-Like Emission from a Sandwiched MoTe2 Heterostructure on a Silicon Single-Mode Resonator

Hanlin Fang; Jin Liu; Qiaoling Lin; Rongbin Su; Yuming Wei; Thomas F. Krauss; Juntao Li; Yue Wang; Xuehua Wang

doi:10.1002/adom.201900538

Laser-Like Emission from a Sandwiched MoTe₂ Heterostructure on a Silicon Single-Mode Resonator

Hanlin Fang, Jin Liu, Qiaoling Lin, Rongbin Su, Yuming Wei, Thomas F. Krauss, Juntao Li^*, Yue Wang, Xuehua Wang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

Molybdenum ditelluride (MoTe₂) has recently shown promise as a gain material for silicon photonics. Reliable single-mode operation and material stability remain two of the major issues that need to be addressed to advance this exciting technology, however. Here, laser-like emission from a sandwiched MoTe₂ heterostructure on a silicon single-mode resonator is reported. The heterostructure consists of a layer of MoTe₂ sandwiched between thin films of hexagonal boron nitride. It is known that tellurium compounds are sensitive to oxygen exposure, which leads to rapid degradation of the exposed layers in air. By encapsulating the MoTe₂ gain material, much improved environmental stability is observed. Using a recently introduced single-mode resonator design, better control over the mode spectrum of the cavity is exercised and single-mode operation with a wide free spectral range is demonstrated. At room temperature, a Q-factor of 4500 and a threshold of 4.2 kW cm⁻² at 1319 nm wavelength are achieved. These results lend further support to the paradigm of 2D material-based integrated light sources on the silicon platform.

Original language	English
Article number	1900538
Number of pages	5
Journal	Advanced Optical Materials
Volume	7
Issue number	20
Early online date	26 Jul 2019
DOIs	https://doi.org/10.1002/adom.201900538
Publication status	Published - 21 Oct 2019

Bibliographical note

© 2019 WILEY‐VCH Verlag GmbH & Co. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

Keywords

device robustness
hBN encapsulation
laser-like emission
MoTe
single-mode operation

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Cite this

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abstract = "Molybdenum ditelluride (MoTe2) has recently shown promise as a gain material for silicon photonics. Reliable single-mode operation and material stability remain two of the major issues that need to be addressed to advance this exciting technology, however. Here, laser-like emission from a sandwiched MoTe2 heterostructure on a silicon single-mode resonator is reported. The heterostructure consists of a layer of MoTe2 sandwiched between thin films of hexagonal boron nitride. It is known that tellurium compounds are sensitive to oxygen exposure, which leads to rapid degradation of the exposed layers in air. By encapsulating the MoTe2 gain material, much improved environmental stability is observed. Using a recently introduced single-mode resonator design, better control over the mode spectrum of the cavity is exercised and single-mode operation with a wide free spectral range is demonstrated. At room temperature, a Q-factor of 4500 and a threshold of 4.2 kW cm−2 at 1319 nm wavelength are achieved. These results lend further support to the paradigm of 2D material-based integrated light sources on the silicon platform.",

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AU - Krauss, Thomas F.

AU - Li, Juntao

AU - Wang, Yue

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