Plasmon-Assisted selective enhancement of direct-band transitions in multi-layer MoS2

Tejendra Dixit, Ankit Arora, Miryala Muralidhar, Masato Murakami, Pramoda K. Nayak, Kolla Lakshmi Ganapathi, M. S. Ramachandra Rao

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Multi-layer MoS2offers numerous advantages over mono-layer MoS2 in terms of improved absorption, enhanced emission and high optical density of states, which make it a better candidate for devices. However, the selective tuning of the direct-band emissions in multi-layer MoS2 is essential for various optoelectronic applications. In this work, we have demonstrated a systematic tuning of direct-band transitions in multi-layer MoS2using Au coating prepared by sputtering and e-beam evaporation. We observed nearly 80-fold enhancement in the ratio of direct-To indirect-peak intensity with Au coating (e-beam) to that of the direct-To indirect-peak intensity of pristine samples. Along with that, complete quenching in the emissions corresponding to I-valley has been observed with Au coating. This work provides new dimensions towards the realization of plasmonic/optoelectronic devices based on multi-layer MoS2

Original languageEnglish
JournalIEEE Photonics Journal
Volume11
Issue number5
DOIs
Publication statusPublished - 2019 Oct

Keywords

  • Direct band transition
  • Exciton-plasmon coupling
  • Multi-layer MoS
  • Photoluminescence spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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