Optical Gain in MoS2 via Coupling with Nanostructured Substrate : Fabry-Perot Interference and Plasmonic Excitation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Hye Yun Jeong
  • Un Jeong Kim
  • Hyun Kim
  • Gang Hee Han
  • Hyangsook Lee
  • Min Su Kim
  • Youngjo Jin
  • Si Young Lee
  • Young-Geun Roh
  • Won-Jae Joo
  • Sung Woo Hwang
  • Yeonsang Park
  • Young Hee Lee

Detail(s)

Original languageEnglish
Pages (from-to)8192-8198
Journal / PublicationACS Nano
Volume10
Issue number9
Online published24 Aug 2016
Publication statusPublished - 27 Sep 2016
Externally publishedYes

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.

Research Area(s)

  • Fabry-Perot interference, local field enhancement, molybdenum disulfide, multireflection, photoluminescence, Purcell effect

Citation Format(s)

Optical Gain in MoS2 via Coupling with Nanostructured Substrate : Fabry-Perot Interference and Plasmonic Excitation. / Jeong, Hye Yun; Kim, Un Jeong; Kim, Hyun et al.

In: ACS Nano, Vol. 10, No. 9, 27.09.2016, p. 8192-8198.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review