Tuning the photo-response in monolayer MoS2 by plasmonic nano-antenna

Abstract

Monolayer molybdenum disulfide (MoS2) has recently attracted intense interests due to its remarkable optical properties of valley-selected optical response, strong nonlinear wave mixing and photocurrent/photovoltaic generation and many corresponding potential applications. However, the nature of atomic-thin thickness of monolayer MoS2 leads to inefficient light-matter interactions and thereby hinders its optoelectronic applications. Here we report on the enhanced and controllable photo-response in MoS2 by utilizing surface plasmonic resonance based on metallic nano-antenna with characteristic lateral size of 40 × 80 nm. Our nano-antenna is designed to have one plasmonic resonance in the visible range and can enhance the MoS2 photoluminescence intensity up to 10 folds. The intensity enhancement can be effectively tuned simply by the manipulation of incident light polarization. In addition, we can also control the oscillator strength ratio between exciton and trion states by controlling polarization dependent hot carrier doping in MoS2. Our results demonstrate the possibility in controlling the photo-response in broad two-dimensional materials by well-designed nano-antenna and facilitate its coming optoelectronic applications.

Molecular chemistry approaches for tuning the properties of two-dimensional transition metal dichalcogenides

“…These structures are particularly interesting for catalysis, plasmonics or sensing. 337,[394][395][396][397][398][399][400][401][402][403][404][405][406][407][408] The growth of can be achieved via non-covalently or covalently bound organic surface functionalities 372, 383,400,401,403 nicely illustrating that TMD functionalization can be used to create hybrid structures.…”

Observation of Tunable Charged Exciton Polaritons in Hybrid Monolayer WS2−Plasmonic Nanoantenna System

“…At the single plasmonic nanoparticle level there is no clear evidence of reaching the strong coupling regime, although efforts have been made [22]. Additionally, a number of recent works report on photoluminescence (PL) modification and enhancement as a result of plasmon-exciton coupling in the weak coupling regime [23][24][25][26][27]. It is important to note that, molecular Jaggregates, which have been extensively used to achieve the strong coupling regime [5, 6,9], [28,29], suffer from optical bleaching and are not stable under ambient conditions.…”

Hybridizing Plasmonic Materials with 2D‐Transition Metal Dichalcogenides toward Functional Applications

“…The PL intensity of MoS 2 was boosted up to ten times by manipulating the incident light polarization. The scheme of periodic Ag nanoantenna arrays on the monolayer MoS 2 and PL spectra of the Ag antenna/MoS 2 hybrid structure under excitation with different polarization angles is shown in Figure 15b 162. The maximum PL enhancement was achieved when the polarization θ is 0°.…”

“…b) Scheme of periodic Ag nanoantenna arrays on monolayer MoS 2 and PL spectra of Ag nanoantenna‐decorated MoS 2 under excitation with different polarization angles. Reproduced with permission 162. Copyright 2016, Springer Nature.…”