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Article ; Online: Regulation of Hot Electrons Transport Achieved through Controlled Electron-Phonon Coupling in Metallic Heterostructures.

Wang, Yingjie / Li, Keming / Jiang, Lan / Gao, Guoquan / Li, Jiafang / Zhu, Tong

Small (Weinheim an der Bergstrasse, Germany)

2024 , Page(s) e2400017

Abstract: The electron-phonon (e-ph) interactions are pivotal in shaping the electrical and thermal properties, and in particular, determining the carrier dynamics and transport behaviors in optoelectronic devices. By employing pump-probe spectroscopy and ... ...

Abstract	The electron-phonon (e-ph) interactions are pivotal in shaping the electrical and thermal properties, and in particular, determining the carrier dynamics and transport behaviors in optoelectronic devices. By employing pump-probe spectroscopy and ultrafast microscopy, the consequential role of e-ph coupling strength in the spatiotemporal evolution of hot electrons is elucidated. Thermal transport across the metallic interface is controlled to regulate effective e-ph coupling factor G
Language	English
Publishing date	2024-02-11
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2168935-0
ISSN	1613-6829 ; 1613-6810
ISSN (online)	1613-6829
ISSN	1613-6810
DOI	10.1002/smll.202400017
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Article ; Online: Key Role of Asymmetric Photothermal Effect in Selectively Chiral Switching of Plasmonic Dimer Driven by Circularly Polarized Light.

Song, Jian / Ji, Chang-Yin / Ma, Xiaoyun / Li, Jiafang / Zhao, Wenjing / Wang, Rong-Yao

The journal of physical chemistry letters

2024 Volume 15, Issue 4, Page(s) 975–982

Abstract: Strong interaction between circularly polarized light and chiral plasmonic nanostructures can enable controllable asymmetric photophysical processes, such as selective chiral switching of a plasmonic nanorod-dimer. Here, we uncover the underlying physics ...

Abstract	Strong interaction between circularly polarized light and chiral plasmonic nanostructures can enable controllable asymmetric photophysical processes, such as selective chiral switching of a plasmonic nanorod-dimer. Here, we uncover the underlying physics that governs this chiral switching by theoretically investigating the interplay between asymmetric photothermal and optomechanical effects. We find that the photothermally induced local temperature rises could play a key role in activating the dynamic chiral configurations of a plasmonic dimer due to the temperature-sensitive molecular linkages located at the gap region. Importantly, different temperature rises caused by the opposite handedness of light could facilitate selective chiral switching of the plasmonic dimer driven by asymmetric optical torques. Our analyses on the wavelength-dependent selectively chiral switching behaviors are in good agreement with the experimental observations. This work contributes to a comprehensive understanding of the physical mechanism involved in the experimentally designed photoresponsive plasmonic nanosystems for practical applications.
Language	English
Publishing date	2024-01-22
Publishing country	United States
Document type	Journal Article
ISSN	1948-7185
ISSN (online)	1948-7185
DOI	10.1021/acs.jpclett.3c03387
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Article ; Online: Spatial Writing of Ultrafast All-Optical Switching.

Ning, Ziqian / Jiang, Lan / Sun, Jingya / Lian, Yiling / Yuan, Yongjiu / Wang, Ruiyang / Li, Jiafang / Yang, Yang

ACS nano

2024 Volume 18, Issue 13, Page(s) 9535–9542

Abstract: Writing spatial information on ultrafast all-optical switching is essential for constructing ultrafast processing units in photonic applications, such as optical communication and computing networks. However, most methods ignore the fabrication and ... ...

Abstract	Writing spatial information on ultrafast all-optical switching is essential for constructing ultrafast processing units in photonic applications, such as optical communication and computing networks. However, most methods ignore the fabrication and imaging of controllable switching area, limiting its spatial information and the further design in ultrafast devices. Here, we propose a method to spatially write in ultrafast all-optical switching based on MAPbI
Language	English
Publishing date	2024-03-24
Publishing country	United States
Document type	Journal Article
ISSN	1936-086X
ISSN (online)	1936-086X
DOI	10.1021/acsnano.3c12552
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Article: Atomistic-Continuum Study of an Ultrafast Melting Process Controlled by a Femtosecond Laser-Pulse Train.

Meng, Yu / Gong, An / Chen, Zhicheng / Wang, Qingsong / Guo, Jianwu / Li, Zihao / Li, Jiafang

Materials (Basel, Switzerland)

2023 Volume 17, Issue 1

Abstract: In femtosecond laser fabrication, the laser-pulse train shows great promise in improving processing efficiency, quality, and precision. This research investigates the influence of pulse number, pulse interval, and pulse energy ratio on the lateral and ... ...

Abstract	In femtosecond laser fabrication, the laser-pulse train shows great promise in improving processing efficiency, quality, and precision. This research investigates the influence of pulse number, pulse interval, and pulse energy ratio on the lateral and longitudinal ultrafast melting process using an experiment and the molecular dynamics coupling two-temperature model (MD-TTM model), which incorporates temperature-dependent thermophysical parameters. The comparison of experimental and simulation results under single and double pulses proves the reliability of the MD-TTM model and indicates that as the pulse number increases, the melting threshold at the edge region of the laser spot decreases, resulting in a larger diameter of the melting region in the 2D lateral melting results. Using the same model, the lateral melting results of five pulses are simulated. Moreover, the longitudinal melting results are also predicted, and an increasing pulse number leads to a greater early-stage melting depth in the melting process. In the case of double femtosecond laser pulses, the pulse interval and pulse energy ratio also affect the early-stage melting depth, with the best enhancement observed with a 2 ps interval and a 3:7 energy ratio. However, pulse number, pulse energy ratio, and pulse interval do not affect the final melting depth with the same total energies. The findings mean that the phenomena of melting region can be flexibly manipulated through the laser-pulse train, which is expected to be applied to improve the structural precision and boundary quality.
Language	English
Publishing date	2023-12-29
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2487261-1
ISSN	1996-1944
ISSN	1996-1944
DOI	10.3390/ma17010185
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Article ; Online: 3D printing of plasmonic nanofocusing tip enabling high resolution, high throughput and high contrast optical near-field imaging.

Long, Li / Deng, Qiurong / Huang, Rongtao / Li, Jiafang / Li, Zhi-Yuan

Light, science & applications

2023 Volume 12, Issue 1, Page(s) 219

Abstract: Scanning near-field optical microscopy (SNOM) offers a means to reach a fine spatial resolution down to ~ 10 nm, but unfortunately suffers from low transmission efficiency of optical signal. Here we present design and 3D printing of a fiber-bound polymer- ...

Abstract	Scanning near-field optical microscopy (SNOM) offers a means to reach a fine spatial resolution down to ~ 10 nm, but unfortunately suffers from low transmission efficiency of optical signal. Here we present design and 3D printing of a fiber-bound polymer-core/gold-shell spiral-grating conical tip that allows for coupling the inner incident optical signal to the outer surface plasmon polariton with high efficiency, which then adiabatically transport, squeeze, and interfere constructively at the tip apex to form a plasmonic superfocusing spot with tiny size and high brightness. Numerical simulations and optical measurements show that this specially designed and fabricated tip has 10% transmission efficiency, ~ 5 nm spatial resolution, 20 dB signal-to-noise ratio, and 7000 pixels per second fast scanning speed. This high-resolution, high throughput, and high contrast SNOM would open up a new frontier of high spatial-temporal resolution detecting, imaging, and monitoring of single-molecule physical, chemical, and biological systems, and deepen our understanding of their basic science in the single-molecule level.
Language	English
Publishing date	2023-09-06
Publishing country	England
Document type	Journal Article
ZDB-ID	2662628-7
ISSN	2047-7538 ; 2047-7538
ISSN (online)	2047-7538
ISSN	2047-7538
DOI	10.1038/s41377-023-01272-6
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Article ; Online: Broadband and high-efficiency polarization conversion with a nano-kirigami based metasurface.

Liu, Xing / Zhang, Xiaochen / Dong, Weikang / Liang, Qinghua / Ji, Chang-Yin / Li, Jiafang

Scientific reports

2023 Volume 13, Issue 1, Page(s) 7454

Abstract: Nano-kirigami metasurfaces have attracted increasing attention due to their ease of three-dimension (3D) nanofabrication, versatile shape transformations, appealing manipulation capabilities and rich potential applications in nanophotonic devices. ... ...

Abstract	Nano-kirigami metasurfaces have attracted increasing attention due to their ease of three-dimension (3D) nanofabrication, versatile shape transformations, appealing manipulation capabilities and rich potential applications in nanophotonic devices. Through adding an out-of-plane degree of freedom to the double split-ring resonators (DSRR) by using nano-kirigami method, in this work we demonstrate the broadband and high-efficiency linear polarization conversion in the near-infrared wavelength band. Specifically, when the two-dimensional DSRR precursors are transformed into 3D counterparts, a polarization conversion ratio (PCR) of more than 90% is realized in wide spectral range from 1160 to 2030 nm. Furthermore, we demonstrate that the high-performance and broadband PCR can be readily tailored by deliberately deforming the vertical displacement or adjusting the structural parameters. Finally, as a proof-of-concept demonstration, the proposal is successfully verified by adopting the nano-kirigami fabrication method. The studied nano-kirigami based polymorphic DSRR mimic a sequence of discrete bulk optical components with multifunction, thereby eliminating the need for their mutual alignment and opening new possibilities.
Language	English
Publishing date	2023-05-08
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-34590-1
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Article ; Online: Wide-Size Range and High Robustness Self-Assembly Micropillars for Capturing Microspheres.

Li, Min / Jiang, Lan / Li, Xiaowei / Li, Taoyong / Yi, Peng / Li, Xibiao / Zhang, Leyi / Li, Luqi / Wang, Zhi / Zhang, Xiangyu / Wang, Andong / Li, Jiafang

ACS applied materials & interfaces

2024

Abstract: Capillary force driven self-assembly micropillars (CFSA-MP) holds immense promise for the manipulation and capture of cells/tiny objects, which has great demands of wide size range and high robustness. Here, we propose a novel method to fabricate size- ... ...

Abstract	Capillary force driven self-assembly micropillars (CFSA-MP) holds immense promise for the manipulation and capture of cells/tiny objects, which has great demands of wide size range and high robustness. Here, we propose a novel method to fabricate size-adjustable and highly robust CFSA-MP that can achieve wide size range and high stability to capture microspheres. First, we fabricate a microholes template with an adjustable aspect ratio using the spatial-temporal shaping femtosecond laser double-pulse Bessel beam-assisted chemical etching technique, and then the micropillars with adjustable aspect ratio are demolded by polydimethylsiloxane (PDMS). We fully demonstrated the advantages of the Bessel optical field by using the spatial-temporal shaping femtosecond laser double-pulse Bessel beams to broaden the height range of the micropillars, which in turn expands the size range of the captured microspheres, and finally achieving a wide range of capturing microspheres with a diameter of 5-410 μm. Based on the inverted mold technology, the PDMS micropillars have ultrahigh mechanical robustness, which greatly improves the durability. CFSA-MP has the ability to capture tiny objects with wide range and high stability, which indicates great potential applications in the fields of chemistry, biomedicine, and microfluidics.
Language	English
Publishing date	2024-04-29
Publishing country	United States
Document type	Journal Article
ISSN	1944-8252
ISSN (online)	1944-8252
DOI	10.1021/acsami.4c02749
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Article ; Online: Reprogrammable optical metasurfaces by electromechanical reconfiguration.

Han, Yu / Chen, Shanshan / Ji, Changyin / Liu, Xing / Wang, Yongtian / Liu, Juan / Li, Jiafang

Optics express

2021 Volume 29, Issue 19, Page(s) 30751–30760

Abstract: Metasurfaces, with artificially designed ultrathin and compact optical elements, enable versatile manipulation of the amplitude, phase, and polarization of light waves. While most of the metasurfaces are static and passive, here we propose a ... ...

Abstract	Metasurfaces, with artificially designed ultrathin and compact optical elements, enable versatile manipulation of the amplitude, phase, and polarization of light waves. While most of the metasurfaces are static and passive, here we propose a reprogrammable metasurface based on the state-of-art electromechanical nano-kirigami, which allows for independent manipulation of pixels at visible wavelengths through mechanical deformation of the nanostructures. By incorporating electrostatic forces between the top suspended gold nano-architectures and bottom silicon substrate, out-of-plane deformation of each pixel and the associated phase retardation are independently controlled by applying single voltage to variable pixels or exerting programmable voltage distribution on identical pixels. As a proof-of-concept demonstration, the metasurfaces are digitally controlled and a series of tunable metasurface holograms such as 3D dynamic display and ultrathin planar lenses are achieved at visible wavelengths. The proposed electromechanical metasurface provides a new methodology to explore versatile reconfigurable and programmable functionalities that may lead to advances in a variety of applications such as hologram, 3D displays, data storage, spatial light modulations, and information processing.
Language	English
Publishing date	2021-09-23
Publishing country	United States
Document type	Journal Article
ZDB-ID	1491859-6
ISSN	1094-4087 ; 1094-4087
ISSN (online)	1094-4087
ISSN	1094-4087
DOI	10.1364/OE.434321
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Article ; Online: Characterization of the responses of the caspase 2, 3, 6 and 8 genes to immune challenges and extracellular ATP stimulation in the Japanese flounder (Paralichthys olivaceus).

Li, Shuo / Li, Jiafang / Peng, Weijiao / Hao, Gaixiang / Sun, Jinsheng

BMC veterinary research

2019 Volume 15, Issue 1, Page(s) 20

Abstract: Background: Caspases are a family of conserved intracellular cysteine-dependent aspartate-specific cysteine proteases that play important roles in regulating cell death and inflammation. Our previous study revealed the importance of the inflammatory ... ...

Abstract	Background: Caspases are a family of conserved intracellular cysteine-dependent aspartate-specific cysteine proteases that play important roles in regulating cell death and inflammation. Our previous study revealed the importance of the inflammatory caspase 1 gene in extracellular ATP-mediated immune signaling in Japanese flounder, Paralichthys olivaceus. To explore the potential roles of other caspases in P. olivaceus innate immunity, we extended our study by characterizing of the responses of four additional P. olivaceus caspase genes, termed JfCaspase 2, 3, 6 and 8, to inflammatory challenge and extracellular ATP stimulation. Results: Sequence analysis revealed that the domain structures of all the Japanese flounder caspase proteins are evolutionarily conserved. Quantitative real-time PCR analysis showed that the JfCaspase 2, 3, 6 and 8 genes were expressed ubiquitously but at unequal levels in all examined Japanese flounder normal tissues. In addition, the basal gene expression levels of JfCaspase 2, 3, 6 and 8 were higher than those of JfCaspase 1 in both Japanese flounder head kidney macrophages (HKMs) and peripheral blood leukocytes (PBLs). Furthermore, immune challenge experiments showed that the inflammatory stimuli LPS and poly(I:C) significantly modulated the expression of the JfCaspase 2, 3, 6 and 8 genes in Japanese flounder immune cells. Finally, DNA fragmentation, associated with increased extracellular ATP-induced JfCaspase 2, 3, 6 and 8 gene expression and enzymatic activity, was inhibited by the caspase inhibitor Z-VAD-FMK in the HKMs. Conclusion: Our findings demonstrate broad participation of multiple caspase genes in response to inflammatory stimulation in Japanese flounder immune cells and provide new evidence for the involvement of caspase(s) in extracellular ATP-induced apoptosis in fish.
MeSH term(s)	Adenosine Triphosphate/pharmacology ; Animals ; Apoptosis/drug effects ; Apoptosis/physiology ; Caspase 2/genetics ; Caspase 2/physiology ; Caspase 3/genetics ; Caspase 3/physiology ; Caspase 6/genetics ; Caspase 6/physiology ; Caspase 8/genetics ; Caspase 8/physiology ; Fish Proteins/genetics ; Fish Proteins/physiology ; Flounder/genetics ; Flounder/immunology ; Gene Expression Regulation/drug effects ; Genes/drug effects ; Immunity, Innate/drug effects ; Immunity, Innate/immunology ; Lipopolysaccharides/pharmacology ; Phylogeny ; Real-Time Polymerase Chain Reaction/veterinary ; Sequence Alignment/veterinary ; Sequence Analysis, DNA/veterinary
Chemical Substances	Fish Proteins ; Lipopolysaccharides ; Adenosine Triphosphate (8L70Q75FXE) ; Caspase 2 (EC 3.4.22.-) ; Caspase 3 (EC 3.4.22.-) ; Caspase 6 (EC 3.4.22.-) ; Caspase 8 (EC 3.4.22.-)
Language	English
Publishing date	2019-01-08
Publishing country	England
Document type	Journal Article
ZDB-ID	2191675-5
ISSN	1746-6148 ; 1746-6148
ISSN (online)	1746-6148
ISSN	1746-6148
DOI	10.1186/s12917-018-1763-y
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Article ; Online: Optoelectronically navigated nano-kirigami microrotors.

Hong, Xiaorong / Xu, Bingrui / Li, Gong / Nan, Fan / Wang, Xian / Liang, Qinghua / Dong, Wenbo / Dong, Weikang / Sun, Haozhe / Zhang, Yongyue / Li, Chongrui / Fu, Rongxin / Wang, Zhuoran / Shen, Guozhen / Wang, Yeliang / Yao, Yugui / Zhang, Shuailong / Li, Jiafang

Science advances

2024 Volume 10, Issue 17, Page(s) eadn7582

Abstract: With the rapid development of micro/nanofabrication technologies, the concept of transformable kirigami has been applied for device fabrication in the microscopic world. However, most nano-kirigami structures and devices were typically fabricated or ... ...

Abstract	With the rapid development of micro/nanofabrication technologies, the concept of transformable kirigami has been applied for device fabrication in the microscopic world. However, most nano-kirigami structures and devices were typically fabricated or transformed at fixed positions and restricted to limited mechanical motion along a single axis due to their small sizes, which significantly limits their functionalities and applications. Here, we demonstrate the precise shaping and position control of nano-kirigami microrotors. Metallic microrotors with size of ~10 micrometers were deliberately released from the substrates and readily manipulated through the multimode actuation with controllable speed and direction using an advanced optoelectronic tweezers technique. The underlying mechanisms of versatile interactions between the microrotors and electric field are uncovered by theoretical modeling and systematic analysis. This work reports a novel methodology to fabricate and manipulate micro/nanorotors with well-designed and sophisticated kirigami morphologies, providing new solutions for future advanced optoelectronic micro/nanomachinery.
Language	English
Publishing date	2024-04-24
Publishing country	United States
Document type	Journal Article
ZDB-ID	2810933-8
ISSN	2375-2548 ; 2375-2548
ISSN (online)	2375-2548
ISSN	2375-2548
DOI	10.1126/sciadv.adn7582
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