We demonstrate a facile and effective approach to significantly improve the photoluminescence of bulk MoS2 via laser thinning followed by gold particle decoration. Upon laser thinning of exfoliated bulk MoSz photolumi...We demonstrate a facile and effective approach to significantly improve the photoluminescence of bulk MoS2 via laser thinning followed by gold particle decoration. Upon laser thinning of exfoliated bulk MoSz photoluminescence emerges from the laser-thinned region. After further treatment with an AuCl3 solution, gold particles self-assemble on the laser-thinned region and thick edges, further increasing the fluorescence of bulk MoS2 28 times and the Raman response 3 times. Such fluorescence enhancement can be attributed to both surface plasmon resonance and p-type doping induced by gold particles. The combination of laser thinning and AuCl3 treatment enables the functionalization of bulk MoS2 for optoelectronic applications. It can also provide a viable strategy for mask-free and area-selective p-type doping on single MoS2 flakes.展开更多
A compact saturable absorber mirror（SAM） based on few-layer molybdenum disulfide（MoS2） nanoplatelets was fabricated and successfully used as an efficient saturable absorber（SA） for the passively Q-switched solid...A compact saturable absorber mirror（SAM） based on few-layer molybdenum disulfide（MoS2） nanoplatelets was fabricated and successfully used as an efficient saturable absorber（SA） for the passively Q-switched solid-state laser at 1 μm wavelength. Pulses as short as 182 ns were obtained from a ytterbium-doped（Yb:LGGG） bulk laser Q-switched by the MoS2 SAM, which we believe to be the shortest one ever achieved from the MoS2 SAs-based Q-switched bulk lasers. A maximum average output power of 0.6 W was obtained with a slope efficiency of 24%,corresponding to single pulse energy up to 1.8 μJ. In addition, the simultaneous dual-wavelength Q-switching at 1025.2 and 1028.1 nm has been successfully achieved. The results indicate the promising potential of few-layer MoS2 nanoplatelets as nonlinear optical switches for achieving efficient pulsed bulk lasers.展开更多
Layered van der Waals(vdW)materials have emerged as a promising platform for nanophotonics due to large refractive indexes and giant optical anisotropy.Unlike conventional dielectrics and semiconductors,the absence of...Layered van der Waals(vdW)materials have emerged as a promising platform for nanophotonics due to large refractive indexes and giant optical anisotropy.Unlike conventional dielectrics and semiconductors,the absence of covalent bonds between layers allows for novel degrees of freedom in designing optically resonant nanophotonic structures down to the atomic scale:from the precise stacking of vertical heterostructures to controlling the twist angle between crystallographic axes.Specifically,although monolayers of transition metal dichalcogenides exhibit giant second-order nonlinear responses,their bulk counterparts with 2H stacking possess zero second-order nonlinearity.In this work,we investigate second harmonic generation(SHG)arising from the interface of WS_(2)/MoS_(2)hetero-bilayer thin films with an additional SHG enhancement in nanostructured optical antennas,mediated by both the excitonic resonances and the anapole-driven field enhancement.When both conditions are met,we observe up to 102 SHG signal enhancement,compared to unstructured bilayers,with SHG conversion efficiency reaching≈10^(−7).Our results highlights vdW materials as a platform for designing unique multilayer optical nanostructures and metamaterial,paving the way for advanced applications in nanophotonics and nonlinear optics.展开更多
文摘We demonstrate a facile and effective approach to significantly improve the photoluminescence of bulk MoS2 via laser thinning followed by gold particle decoration. Upon laser thinning of exfoliated bulk MoSz photoluminescence emerges from the laser-thinned region. After further treatment with an AuCl3 solution, gold particles self-assemble on the laser-thinned region and thick edges, further increasing the fluorescence of bulk MoS2 28 times and the Raman response 3 times. Such fluorescence enhancement can be attributed to both surface plasmon resonance and p-type doping induced by gold particles. The combination of laser thinning and AuCl3 treatment enables the functionalization of bulk MoS2 for optoelectronic applications. It can also provide a viable strategy for mask-free and area-selective p-type doping on single MoS2 flakes.
基金supported by the National Natural Science Foundation of China (Grant Nos. 51321091, 61275142, 61308042, and 91022003)China Postdoctoral Science Foundation (Grant Nos. 2013M531594, 2014T70633)
文摘A compact saturable absorber mirror（SAM） based on few-layer molybdenum disulfide（MoS2） nanoplatelets was fabricated and successfully used as an efficient saturable absorber（SA） for the passively Q-switched solid-state laser at 1 μm wavelength. Pulses as short as 182 ns were obtained from a ytterbium-doped（Yb:LGGG） bulk laser Q-switched by the MoS2 SAM, which we believe to be the shortest one ever achieved from the MoS2 SAs-based Q-switched bulk lasers. A maximum average output power of 0.6 W was obtained with a slope efficiency of 24%,corresponding to single pulse energy up to 1.8 μJ. In addition, the simultaneous dual-wavelength Q-switching at 1025.2 and 1028.1 nm has been successfully achieved. The results indicate the promising potential of few-layer MoS2 nanoplatelets as nonlinear optical switches for achieving efficient pulsed bulk lasers.
基金Funded by the European Union(ERC,METANEXT,101078018 and EIC,NEHO,101046329)Views and opinions expressed are however those of the author(s)only and do not necessarily reflect those of the European Union,the European Research Council Executive Agency,or the European Innovation Council and SMEs Executive Agency(EISMEA).Neither the European Union nor the granting authority can be held responsible for them.This work was also funded by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)under Germany’s Excellence Strategy(EXC 2089/1-390776260)+7 种基金Sachbeihilfe MA 4699/7-1 and the Emmy Noether program(TI 1063/1)the Bavarian program Solar Energies Go Hybrid(SolTech)and the Center for NanoScience(CeNS)L.S.acknowledges funding support through a Humboldt Research Fellowship from the Alexander von Humboldt FoundationA.To.acknowledges the financial support from the European Union through”FESR o FSE,PON Ricerca e Innovazione 2014-2020-DM 1062/2021”the University of Palermo through”Fondo Finalizzato alla Ricerca di Ateneo 2024(FFR2024)”This work was partially supported by the European Union under the Italian National Recovery and Resilience Plan(NRRP)of Next Generation EU,of partnership on“Telecommunications of the Future”(PE00000001-program“RESTART”)S2 SUPER-Programmable Networks,Cascade project PRISM-CUP:C79J24000190004.C.D.A.and P.F.acknowledge the financial support from the European Union”METAFAST”H2020-FETOPEN-2018-2020 project,grant agreement no.899673from Ministero Italiano dell’Istruzione(MIUR)through the”METEOR”project PRIN-20202020EY2LJT_002.
文摘Layered van der Waals(vdW)materials have emerged as a promising platform for nanophotonics due to large refractive indexes and giant optical anisotropy.Unlike conventional dielectrics and semiconductors,the absence of covalent bonds between layers allows for novel degrees of freedom in designing optically resonant nanophotonic structures down to the atomic scale:from the precise stacking of vertical heterostructures to controlling the twist angle between crystallographic axes.Specifically,although monolayers of transition metal dichalcogenides exhibit giant second-order nonlinear responses,their bulk counterparts with 2H stacking possess zero second-order nonlinearity.In this work,we investigate second harmonic generation(SHG)arising from the interface of WS_(2)/MoS_(2)hetero-bilayer thin films with an additional SHG enhancement in nanostructured optical antennas,mediated by both the excitonic resonances and the anapole-driven field enhancement.When both conditions are met,we observe up to 102 SHG signal enhancement,compared to unstructured bilayers,with SHG conversion efficiency reaching≈10^(−7).Our results highlights vdW materials as a platform for designing unique multilayer optical nanostructures and metamaterial,paving the way for advanced applications in nanophotonics and nonlinear optics.
