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学者姓名：徐金龙
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Abstract ：
Integrated on-chip femtosecond (fs) laser optoelectronic system, with photodetector as a critical component for light-electrical signal conversion, is a long-sought-after goal for a wide range of frontier applications. However, the high laser peak intensity and complicated nanophotonic waveguide structure of on-chip fs laser are beyond the detectability and integrability of conventional photodetectors. Therefore, flexible photodetector with the response on intense fs laser is in urgent needs. Herein, we demonstrate the first (to our knowledge) two-photon absorption (TPA) flexible photodetector based on the strong TPA nonlinearity of layered hybrid perovskite (IA)2(MA)2Pb3Br10, exhibiting efficient sub-bandgap response on the infrared fs laser at 700-1000 nm. High saturation intensity up to similar to 3.8 MW/cm2 is achieved. The device also shows superior current stability even after bending for 1000 cycles. This work may pave the new way for the application of flexible optoelectronics specialized in integrated fs-laser detection. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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| GB/T 7714 | Xu, Yanming , Wang, Fan , Xu, Jinlong et al. Two-photon absorption flexible photodetector responsive to femtosecond laser [J]. | OPTICS EXPRESS , 2024 , 32 (3) : 4334-4345 . |
| MLA | Xu, Yanming et al. "Two-photon absorption flexible photodetector responsive to femtosecond laser" . | OPTICS EXPRESS 32 . 3 (2024) : 4334-4345 . |
| APA | Xu, Yanming , Wang, Fan , Xu, Jinlong , Lv, Xinjie , Zhao, Gang , Sun, Zhihua et al. Two-photon absorption flexible photodetector responsive to femtosecond laser . | OPTICS EXPRESS , 2024 , 32 (3) , 4334-4345 . |
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Electronic processors are reaching the physical speed ceiling that heralds the era of optical processors. Multifunctional all-optical logic gates (AOLGs) of massively parallel processing are of great importance for large-scale integrated optical processors with speed far in excess of electronics, while are rather challenging due to limited operation bandwidth and multifunctional integration complexity. Here we for the first time experimentally demonstrate a reconfigurable all-in-one broadband AOLG that achieves nine fundamental Boolean logics in a single configuration, enabled by ultrabroadband (400-4000 nm) plasmon-enhanced thermo-optical nonlinearity (TONL) of liquid-metal Galinstan nanodroplet assemblies (GNAs). Due to the unique heterogeneity (broad-range geometry sizes, morphology, assembly profiles), the prepared GNAs exhibit broadband plasmonic opto-thermal effects (hybridization, local heating, energy transfer, etc.), resulting in a huge nonlinear refractive index under the order of 10-4-10-5 within visual-infrared range. Furthermore, a generalized control-signal light route is proposed for the dynamic TONL modulation of reversible spatial-phase shift, based on which nine logic functions are reconfigurable in one single AOLG configuration. Our work will provide a powerful strategy on large-bandwidth all-optical circuits for high-density data processing in the future. Multifunctional all-optical logic gate (AOLG) with broadband-based massively parallel processing is desirable for high-speed optical processor. Here, authors propose a reconfigurable all-in-one ultra-broadband AOLG with experimentally achieving 9 fundamental Boolean logics in a single configuration.
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| GB/T 7714 | Xu, Jinlong , Zhang, Chi , Wang, Yulin et al. All-in-one, all-optical logic gates using liquid metal plasmon nonlinearity [J]. | NATURE COMMUNICATIONS , 2024 , 15 (1) . |
| MLA | Xu, Jinlong et al. "All-in-one, all-optical logic gates using liquid metal plasmon nonlinearity" . | NATURE COMMUNICATIONS 15 . 1 (2024) . |
| APA | Xu, Jinlong , Zhang, Chi , Wang, Yulin , Wang, Mudong , Xu, Yanming , Wei, Tianqi et al. All-in-one, all-optical logic gates using liquid metal plasmon nonlinearity . | NATURE COMMUNICATIONS , 2024 , 15 (1) . |
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The concept of ferroelectric polarons is proposed to partially explain the exceptional optoelectronic properties observed in lead halide perovskites (LHPs). It is intriguing but unclear how this proposal, which involves local or transient polarizations, applies in general to 2D LHPs with long-range ferroelectricity. Here, this work presents a pioneering time-domain experimental investigation of polarons in ferroelectric (IA)2(MA)2Pb3Br10 (IMPB; IA is isoamylammonium and MA is methylammonium) using transient absorption spectroscopy. Compared to non-ferroelectric LHPs, IMPB exhibits several distinct polaronic properties closely associated with macroscopic polarizations of ferroelectricity, including a prolonged polaron formation time (approximate to 1.1 ps), a Stark splitting of the bleaching (approximate to 63 meV), and a giant polaron Mott density (approximate to 7.6 x 1018 cm-3). These findings broaden the realm of 2D polaron systems and reveal the decisive role of static/unidirectional polarizations on polaron physics in 2D LHPs. Time-domain experimental investigations of polarons in 2D organometallic perovskite ferroelectric (IA)2(MA)2Pb3Br10 (IA: isoamylammonium and MA: methylammonium) reveals several distinct properties closely associated with macroscopic polarizations of ferroelectricity, including a prolonged polaron formation time, a Stark splitting of the bleaching, and a giant polaron Mott density. image
Keyword ：
macroscopic polarizations macroscopic polarizations perovskite ferroelectric perovskite ferroelectric photophysics photophysics polarons polarons transient absorptions transient absorptions
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| GB/T 7714 | Yu, Junhong , Han, Yadong , Yang, Yunfan et al. Anomalous Polarons in Two-Dimensional Organometallic Perovskite Ferroelectric [J]. | ADVANCED SCIENCE , 2024 , 11 (43) . |
| MLA | Yu, Junhong et al. "Anomalous Polarons in Two-Dimensional Organometallic Perovskite Ferroelectric" . | ADVANCED SCIENCE 11 . 43 (2024) . |
| APA | Yu, Junhong , Han, Yadong , Yang, Yunfan , Zhang, Hang , Liu, Yi , Xu, Jinlong et al. Anomalous Polarons in Two-Dimensional Organometallic Perovskite Ferroelectric . | ADVANCED SCIENCE , 2024 , 11 (43) . |
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