Abstract
The 2-D transition metal dichalcogenide (TMD) semiconductors, has received great attention due to its excellent optical and electronic properties and potential applications in field-effect transistors, light emitting and sensing devices. Recently surface plasmon enhanced photoluminescence (PL) of the weak 2-D TMD atomic layers was developed to realize the potential optoelectronic devices. However, we noticed that the enhancement would not increase monotonically with increasing of metal plasmonic objects and the emission drop after the certain coverage. This study presents the optimized PL enhancement of a monolayer MoS2 in the presence of gold (Au) nanorods. A localized surface plasmon wave of Au nanorods that generated around the monolayer MoS2 can provide resonance wavelength overlapping with that of the MoS2 gain spectrum. These spatial and spectral overlapping between the localized surface plasmon polariton waves and that from MoS2 emission drastically enhanced the light emission from the MoS2 monolayer. We gave a simple model and physical interpretations to explain the phenomena. The plasmonic Au nanostructures approach provides a valuable avenue to enhancing the emitting efficiency of the 2-D nano-materials and their devices for the future optoelectronic devices and systems.
Highlights
Two-dimensional materials have received considerable attention, mainly because of their unusual physical properties compared with their 3-D bulk forms
The growth of the monolayer MoS2 is based on the vapor phase reaction between MoO3 and S as reported by the previous studies[21,22,23]
We investigated the optical properties of single-layered MoS2 by Raman and PL, where the measurements were performed in a Jobin-Yvon Horiba HR800 micro-Raman spectroscope at room temperature
Summary
Two-dimensional materials have received considerable attention, mainly because of their unusual physical properties compared with their 3-D bulk forms. The 2-D transition metal dichalcogenide (TMD) semiconductor with electronic properties and a potential range of applications complementary to those of graphene, has recently attracted considerable attention[14]. Surface plasmon enhanced luminescence of the weak 2-D TMD atomic layers was investigated and reported to realize the generation ulra-thin, flexible photonic and electronic devices[15,16,17,18]. Recent studies utilizing silver plasmonic nanodisc arrays to enhance the emission of MoS2 showed that SPR enhancement is a promising way[16]. They did not discuss the density of metallic plasmonic structures to the enhancement of MoS2 emission. Through a careful selection of a suitable Au nanorod with a surface plasmon resonance (SPR) frequency matched the direct band gap of MoS2 (1.86 eV), the localized surface plasmon wave induced by the Au nanorod can spatially and spectrally be overlapped with the emission of a single-layer
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