title: Plasmonic Gold Nanorods Coverage Influence on Enhancement of the Photoluminescence of Two-Dimensional MoS2 Monolayer.
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.
authors.affiliation: Research Center of Applied Sciences (RCAS), Academia Sinica, Taipei, 11529, Taiwan.
authors.forename: Kevin C J
authors.initials: KC
authors.lastname: Lee
authors.affiliation: Research Center of Applied Sciences (RCAS), Academia Sinica, Taipei, 11529, Taiwan.
authors.forename: Yi-Huan
authors.initials: YH
authors.lastname: Chen
authors.affiliation: Research Center of Applied Sciences (RCAS), Academia Sinica, Taipei, 11529, Taiwan.|Department of Photonics, National Chiao Tung University (NCTU), Hsinchu, 30010, Taiwan.
authors.forename: Hsiang-Yu
authors.initials: HY
authors.lastname: Lin
authors.affiliation: Department of Materials Science &Engineering, National Chiao Tung University Hsinchu, 30010, Taiwan.
authors.forename: Chia-Chin
authors.initials: CC
authors.lastname: Cheng
authors.affiliation: Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University (NTHU), Hsinchu, 30013, Taiwan.
authors.forename: Pei-Ying
authors.initials: PY
authors.lastname: Chen
authors.affiliation: Research Center of Applied Sciences (RCAS), Academia Sinica, Taipei, 11529, Taiwan.|Department of Photonics, National Chiao Tung University (NCTU), Hsinchu, 30010, Taiwan.
authors.forename: Ting-Yi
authors.initials: TY
authors.lastname: Wu
authors.affiliation: Department of Photonics, National Chiao Tung University (NCTU), Hsinchu, 30010, Taiwan.|Department of Photonics, National Sun Yat-sen University, Kaohsiung, 804, Taiwan.
authors.forename: Min-Hsiung
authors.initials: MH
authors.lastname: Shih
authors.affiliation: Department of Materials Science &Engineering, National Chiao Tung University Hsinchu, 30010, Taiwan.
authors.forename: Kung-Hwa
authors.initials: KH
authors.lastname: Wei
authors.affiliation: Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Lain-Jong
authors.initials: LJ
authors.lastname: Li
authors.affiliation: Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University (NTHU), Hsinchu, 30013, Taiwan.
authors.forename: Chien-Wen
authors.initials: CW
authors.lastname: Chang