Palladium(Pd)-based sulfides have triggered extensive interest due to their unique properties and potential applications in the fields of electronics and optoelectronics.However,the synthesis of large-scale uniform Pd...Palladium(Pd)-based sulfides have triggered extensive interest due to their unique properties and potential applications in the fields of electronics and optoelectronics.However,the synthesis of large-scale uniform PdS and PdS_(2)nanofilms(NFs)remains an enormous challenge.In this work,2-inch wafer-scale PdS and PdS_(2) NFs with excellent stability can be controllably prepared via chemical vapor deposition combined with electron beam evaporation technique.The thickness of the pre-deposited Pd film and the sulfurization temperature are critical for the precise synthesis of PdS and PdS_(2) NFs.A corresponding growth mechanism has been proposed based on our experimental results and Gibbs free energy calculations.The electrical transport properties of PdS and PdS_(2) NFs were explored by conductive atomic force microscopy.Our findings have achieved the controllable growth of PdS and PdS_(2) NFs,which may provide a pathway to facilitate PdS and PdS_(2) based applications for next-generation high performance optoelectronic devices.展开更多
We demonstrate the generation of noise-like pulses(NLPs)and soliton rains in a graphene saturable absorber modelocked erbium-doped fiber laser.Typical NLPs are obtained at a proper pump power and in a cavity polarizat...We demonstrate the generation of noise-like pulses(NLPs)and soliton rains in a graphene saturable absorber modelocked erbium-doped fiber laser.Typical NLPs are obtained at a proper pump power and in a cavity polarization state.The soliton rain operation with multiple solitons can be achieved by finely adjusting the cavity polarization state.In addition,distinctive multi-soliton interactions are observed and investigated,including the fundamental mode-locking and multiple pulses.The experimental results can help further understand nonlinear pulse dynamics in ultrafast optics.展开更多
Mid-infrared pulsed lasers operating around the 3 μm wavelength regime are important for a wide range of applications including sensing, spectroscopy, imaging, etc. Despite the recent advances in technology, the lack...Mid-infrared pulsed lasers operating around the 3 μm wavelength regime are important for a wide range of applications including sensing, spectroscopy, imaging, etc. Despite the recent advances in technology, the lack of a nonlinear optical modulator operating in the mid-infrared regime remains a significant challenge. Here, we report the third-order nonlinear optical response of gold nanorods(GNRs) ranging from 800 nm to the mid-infrared regime(2810 nm) enabled by their size and overlapping behavior-dependent longitudinal surface plasmon resonance. In addition, we demonstrate a wavelength-tunable Er3+-doped fluoride fiber laser modulated by GNRs, which can deliver pulsed laser output, with the pulse duration down to 533 ns, tunable wavelength ranging from 2760.2 to 2810.0 nm, and spectral 3 d B bandwidth of about 1 nm. The experimental results not only validate the GNRs’ robust mid-infrared nonlinear optical response, but also manifest their application potential in high-performance broadband optoelectronic devices.展开更多
基金supported by National Natural Science Foundation of China (No.11974301)Key Research and Development Program of Hunan Province (No.2022GK2007)+2 种基金Key Project from Department Education of Hunan Province (No.22A0123)Scientific Research Fund of Hunan Provincial Education Department (No.21B0136)National college students innovation and entrepreneurship training program (No.S202310530016)。
文摘Palladium(Pd)-based sulfides have triggered extensive interest due to their unique properties and potential applications in the fields of electronics and optoelectronics.However,the synthesis of large-scale uniform PdS and PdS_(2)nanofilms(NFs)remains an enormous challenge.In this work,2-inch wafer-scale PdS and PdS_(2) NFs with excellent stability can be controllably prepared via chemical vapor deposition combined with electron beam evaporation technique.The thickness of the pre-deposited Pd film and the sulfurization temperature are critical for the precise synthesis of PdS and PdS_(2) NFs.A corresponding growth mechanism has been proposed based on our experimental results and Gibbs free energy calculations.The electrical transport properties of PdS and PdS_(2) NFs were explored by conductive atomic force microscopy.Our findings have achieved the controllable growth of PdS and PdS_(2) NFs,which may provide a pathway to facilitate PdS and PdS_(2) based applications for next-generation high performance optoelectronic devices.
基金Project supported by the Hunan Provincial Natural Science Foundation of China(Nos.2018JJ3514 and 2019JJ40280)the Research and Development Plan of Key Areas in Hunan Province in 2019(No.2019GK2101)+2 种基金the Jiangsu Provincial Natural Science Foundation of China(No.BK20181050)the Natural Science Foundation of Jiangsu Higher Education Institutions of China(Nos.18KJB413007 and 19KJB10061)the 2019 Youth Special Scientific Research Project of Nanjing Xiaozhuang University,China(No.2019NXY17)。
文摘We demonstrate the generation of noise-like pulses(NLPs)and soliton rains in a graphene saturable absorber modelocked erbium-doped fiber laser.Typical NLPs are obtained at a proper pump power and in a cavity polarization state.The soliton rain operation with multiple solitons can be achieved by finely adjusting the cavity polarization state.In addition,distinctive multi-soliton interactions are observed and investigated,including the fundamental mode-locking and multiple pulses.The experimental results can help further understand nonlinear pulse dynamics in ultrafast optics.
基金National Natural Science Foundation of China(NSFC)(11474132,11574079,61378004,61527823,61605166,61605219,61775056)Science and Technology Project of Jilin Province(20160520085JH)+1 种基金Natural Science Foundation of Hunan Province(2017JJ1013)Youth Innovation Promotion Association of the Chinese Academy of Sciences
文摘Mid-infrared pulsed lasers operating around the 3 μm wavelength regime are important for a wide range of applications including sensing, spectroscopy, imaging, etc. Despite the recent advances in technology, the lack of a nonlinear optical modulator operating in the mid-infrared regime remains a significant challenge. Here, we report the third-order nonlinear optical response of gold nanorods(GNRs) ranging from 800 nm to the mid-infrared regime(2810 nm) enabled by their size and overlapping behavior-dependent longitudinal surface plasmon resonance. In addition, we demonstrate a wavelength-tunable Er3+-doped fluoride fiber laser modulated by GNRs, which can deliver pulsed laser output, with the pulse duration down to 533 ns, tunable wavelength ranging from 2760.2 to 2810.0 nm, and spectral 3 d B bandwidth of about 1 nm. The experimental results not only validate the GNRs’ robust mid-infrared nonlinear optical response, but also manifest their application potential in high-performance broadband optoelectronic devices.
