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나노 구조 물리 연구단
나노구조물리 연구단
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Optical Gain in MoS2 via Coupling with Nanostructured Substrate: Fabry-Perot Interference and Plasmonic Excitation

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Title
Optical Gain in MoS2 via Coupling with Nanostructured Substrate: Fabry-Perot Interference and Plasmonic Excitation
Author(s)
Hye Yun Jeong; Kim U.J.; Hyun Kim; Gang Hee Han; Lee H.; Min Su Kim; Youngjo Jin; Thuc Hue Ly; Si Young Lee; Roh Y.-G.; Joo W.-J.; Hwang S.W.; Park Y.; Young Hee Lee
Publication Date
2016-09
Journal
ACS NANO, v.10, no.9, pp.8192 - 8198
Publisher
AMER CHEMICAL SOC
Abstract
Despite the direct band gap of monolayer transition metal dichalcogenides (TMDs), their optical gain remains limited because of the poor light absorption in atomically thin, layered materials. Most approaches to improve the optical gain of TMDs mainly involve modulation of the active materials or multilayer stacking. Here, we report a method to enhance the optical absorption and emission in MoS2 simply through the design of a nanostructured substrate. The substrate consisted of a dielectric nanofilm spacer (TiO2) and metal film. The overall photoluminescence intensity from monolayer MoS2 on the nanostructured substrate was engineered based on the TiO2 thickness and amplified by Fabry-Perot interference. In addition, the neutral exciton emission was selectively amplified by plasmonic excitations from the local field originating from the surface roughness of the metal film with spacer thicknesses of less than 10 nm. We further demonstrate that the quality factor of the device can also be engineered by selecting a spacer material with a different refractive index. © 2016 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/2859
ISSN
1936-0851
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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