Query:
学者姓名:张新平
Refining:
Year
Type
Indexed by
Source
Complex
Co-Author
Language
Clean All
Abstract :
Metallic photonic lattices are promising in their application to plasmonic optical devices; however, scalable fabrication strategies are limited by sample size, response wavelength (mostly in the visible range), cost, and duration. This paper proposes a direct imprinting strategy to fabricate large-area metallic photonic lattices, which present a strong plasmonic response and broadband angle-resolved tuning properties in the infrared region. This simple fabrication strategy combines solution-synthesized Au nanoparticle colloid and imprinting technology, which does not require the use of photoresist or lithography. Thus, the feature size and response wavelength can exceed the limitations of the beam size and wave band, thereby offering the advantages of a low cost and high throughput.
Keyword :
solution-processed direct imprinting solution-processed direct imprinting infrared plasmon resonance infrared plasmon resonance infrared polarization filters infrared polarization filters fano coupling fano coupling metallic photonic lattices metallic photonic lattices
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Dou, Fei , Peng, Chen , Zou, Miaomiao et al. Direct Imprinting of Large-Area Metallic Photonic Lattices for Infrared Polarization Filters with Broadband Tunability [J]. | NANOMATERIALS , 2023 , 13 (6) . |
MLA | Dou, Fei et al. "Direct Imprinting of Large-Area Metallic Photonic Lattices for Infrared Polarization Filters with Broadband Tunability" . | NANOMATERIALS 13 . 6 (2023) . |
APA | Dou, Fei , Peng, Chen , Zou, Miaomiao , Zhang, Xinping . Direct Imprinting of Large-Area Metallic Photonic Lattices for Infrared Polarization Filters with Broadband Tunability . | NANOMATERIALS , 2023 , 13 (6) . |
Export to | NoteExpress RIS BibTex |
Abstract :
Exfoliation of two-dimensional (2D) magnetic materials from non-van der Waals (non-vdW) materials has attracted increasing attention because it provides a great platform for the construction of 2D magnetic materials. For non-vdW magnetic chromium tellurides with high Curie temperatures, their few-layer samples show promising applications in the field of spintronics. However, there is still no consensus on whether the surface structures of few-layer chromium tellurides should be terminated by Cr or Te atoms. By calculating the surface and exfoliation energy, we find that which structure is more stable depends greatly on the value of the chemical potential of Te atoms, and the few-layer sample with a Cr-terminated surface is easier to exfoliate than that with both Te-terminated surfaces. Finally, we propose that different exfoliated structures can be identified by using the atomic number ratio of Cr to Te and the average magnetic moment of Cr atoms in few-layer samples.
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Zhang, Shuqing , Huo, Sitong , Song, Xiaoyan et al. Surface Stability and Exfoliability of Non-van der Waals Magnetic Chromium Tellurides [J]. | JOURNAL OF PHYSICAL CHEMISTRY LETTERS , 2023 , 14 (47) : 10609-10616 . |
MLA | Zhang, Shuqing et al. "Surface Stability and Exfoliability of Non-van der Waals Magnetic Chromium Tellurides" . | JOURNAL OF PHYSICAL CHEMISTRY LETTERS 14 . 47 (2023) : 10609-10616 . |
APA | Zhang, Shuqing , Huo, Sitong , Song, Xiaoyan , Zhang, Xinping . Surface Stability and Exfoliability of Non-van der Waals Magnetic Chromium Tellurides . | JOURNAL OF PHYSICAL CHEMISTRY LETTERS , 2023 , 14 (47) , 10609-10616 . |
Export to | NoteExpress RIS BibTex |
Abstract :
The spintronic device is another application of perovskite beyond solar cells, light emitting diodes, and photodetectors. Spin relaxation with a lifetime of several ps has been observed in both 3D and 2D perovskite. In this study, Ruddlesden-Popper (RP) perovskite single crystals with mixed n and n + 1 phase are synthesized. It is found that the spin-polarized exciton can funnel from n phase to n + 1 phase with spin information retained effectively. Interestingly, the spin lifetime of the funneled exciton in n + 1 phase is much longer than that in the pristine n phase. This is attributed to the fact that the funneling is realized through a polaronic intermediate state, in which the spin relaxation is much slower. The polaronic intermediate states originate from the interaction between photogenerated excitons and the lattice distortion. The formation of the polaronic states can reduce overlap of electron-hole wave function and modified lattice symmetry; these two changes contribute to retain the exciton spin information in such polaronic states. The findings deepen the understanding of spin-polarized exciton transportation and relaxation dynamics and provide a potentially novel approach to enhance the spin relaxation lifetime of perovskite single crystals.
Keyword :
spin coherent lifetime spin coherent lifetime doping doping layered perovskite single crystal layered perovskite single crystal intermediate states intermediate states
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Zhang, Yiwei , Zhang, Baohuan , Wang, Jiawei et al. Spin Preserved Exciton Funneling through a Polaronic Intermediate State in Layered Perovskite Single Crystals [J]. | ADVANCED OPTICAL MATERIALS , 2023 , 11 (6) . |
MLA | Zhang, Yiwei et al. "Spin Preserved Exciton Funneling through a Polaronic Intermediate State in Layered Perovskite Single Crystals" . | ADVANCED OPTICAL MATERIALS 11 . 6 (2023) . |
APA | Zhang, Yiwei , Zhang, Baohuan , Wang, Jiawei , Fu, Yulan , Han, Yu , Guo, Jinxin et al. Spin Preserved Exciton Funneling through a Polaronic Intermediate State in Layered Perovskite Single Crystals . | ADVANCED OPTICAL MATERIALS , 2023 , 11 (6) . |
Export to | NoteExpress RIS BibTex |
Abstract :
We report a thin-film laser amplifier based on a microcavity scheme using distributed Bragg reflectors (DBR). The amplifier is fabricated on the front surface of a glass substrate, whereas, an aluminum (Al) layer is deposited on the back surface, which supplies optical feedback for broadband injection into the amplifier. The Bragg gratings acting as the reflectors for the microcavities are fabricated by interference lithography and the active layer of super-yellow light-emitting PPV copolymer (SY-PPV) is spin-coated onto the top surface, forming a periodical array of DBR microcavities filling with SY-PPV. The broadband reflection by the Al layer is coupled again into the microcavity through the photoresist Bragg gratings and is coupled out of the microcavities after multiple rounds of regenerative amplification. A power amplification factor larger than 22 has been achieved for such a microcavity laser amplifier, so that an average power of about 16 mu W (16 nJ in pulse energy) has been measured at the output of the amplifier for a pump fluence of 35 mu J cm-2. Considering that the optical feedback scheme using the high-reflection Al film for the amplifier is also a part of the DBR oscillators, we define such an amplifier as a self-injection-locked laser amplifier device. Thus, the amplification process also has a pump threshold, which is apparently much lower than that of the oscillator, since the injection supplies additional optical feedback. This work proposes a new design both for organic thin-film laser devices and for microcavity laser amplifiers, which is important for integrated photonic and optoelectronic systems. A self-injected regenerative laser amplifier is achieved on a periodic array of DBR microcavities, where an Al coating on the back of the substrate supplies high-reflection of the output of the oscillator and facilitates injection of the amplifier.
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Zhang, Tianqi , Wu, Wenwen , Liu, Yue et al. Broad-band self-injection organic laser amplifier based on a DBR microcavity [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2023 , 11 (41) : 14352-14358 . |
MLA | Zhang, Tianqi et al. "Broad-band self-injection organic laser amplifier based on a DBR microcavity" . | JOURNAL OF MATERIALS CHEMISTRY C 11 . 41 (2023) : 14352-14358 . |
APA | Zhang, Tianqi , Wu, Wenwen , Liu, Yue , Zhang, Xinping . Broad-band self-injection organic laser amplifier based on a DBR microcavity . | JOURNAL OF MATERIALS CHEMISTRY C , 2023 , 11 (41) , 14352-14358 . |
Export to | NoteExpress RIS BibTex |
Abstract :
There are conventionally coherent and incoherent types of random lasers, which are characteristic of broadband and randomly distributed narrow-band lasing spectrum, respectively. No fixed phase relationship has ever been observed between the lasing modes in such lasers. However, herein a new form of random lasers in patterned organic-inorganic hybrid perovskite MAPbBr(3) is discovered, where multiple simultaneously lasing modes are stably locked in phase so that lasing lines are achieved with equal spectral separations. This is the first observation of phase locking between random lasers, which is established by the cascaded molecular absorption-emission or cascaded excitation-injection processes between random laser modes. The fixed phase relationship is determined by the ultrafast relaxation of the excited molecules to the lower edge of the excitation band, correlating directly the absorption/excitation and emission/injection processes and producing a fixed phase shift. Thus, the bandwidth and separation of the lasing lines are dependent on the relaxation lifetime of the excited molecules and the number of cascading cycles. Such cascading dynamics has a timescale faster than 300 fs. These characteristics innovate the physics and explore new applications of both the MAPbBr(3) material and the random lasers. Such a strong phase-locking mechanism suggests new mode-locking schemes for ultrafast lasers.
Keyword :
microspectroscopy microspectroscopy random lasers random lasers equally separated lasing lines equally separated lasing lines ultrafast intraband relaxation ultrafast intraband relaxation phase locking phase locking cascaded molecular excitation cascaded molecular excitation
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Zhang, Xinping , Hu, Jingyun , Fu, Yulan et al. Phase-Locking of Random Lasers by Cascaded Ultrafast Molecular Excitation Dynamics [J]. | LASER & PHOTONICS REVIEWS , 2023 , 17 (3) . |
MLA | Zhang, Xinping et al. "Phase-Locking of Random Lasers by Cascaded Ultrafast Molecular Excitation Dynamics" . | LASER & PHOTONICS REVIEWS 17 . 3 (2023) . |
APA | Zhang, Xinping , Hu, Jingyun , Fu, Yulan , Guo, Jinxin , Zhang, Yiwei , Song, Xiaoyan . Phase-Locking of Random Lasers by Cascaded Ultrafast Molecular Excitation Dynamics . | LASER & PHOTONICS REVIEWS , 2023 , 17 (3) . |
Export to | NoteExpress RIS BibTex |
Abstract :
Organic molecules, including the benzene series, have been identified as pollutants in environmental water. Due to their very low solubility, they have very small concentrations in water, and they are difficult to be detected by conventional techniques. In particular, there is a lack of real-time, accurate, and rapid detection methods for such molecules in water. However, they are detrimental to human health in many aspects. Toluene has been an important indicator of such environmental pollution detections. In this work, we propose a 3D SERS scheme consisting of a hollow fiber that is coated on the inner wall with densely arranged silver nanoparticles, which supplies multifold Raman enhancement by the plasmonic microcavity. Strong confinement of excitation laser energy and strongly enhanced Raman signals with the bidirectional collection are utilized to achieve high-sensitivity detection of toluene molecules in water. Raman signal with a reasonable signal-to-noise ratio has been measured for a concentration of 0.53 mg/L, indicating a detection limit even lower than this value for such a Raman spectroscopic technique. The corresponding enhancement factor is higher than 6 x 10(3) with respect to the available systems. Thus, this device not only enables direct trace detection and real-time monitoring of the water-polluting status by organic molecules but also supplies a practical approach for biological sensing.
Keyword :
trace detection trace detection SERS hollow fibers SERS hollow fibers toluene toluene direct in-situ detection of environmental water direct in-situ detection of environmental water water pollution water pollution
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Mu, Yunyun , Liu, Miao , Li, Jiajun et al. Multifold Enhanced Raman Detection of Organic Molecules as Environmental Water Pollutants [J]. | BIOSENSORS-BASEL , 2023 , 13 (1) . |
MLA | Mu, Yunyun et al. "Multifold Enhanced Raman Detection of Organic Molecules as Environmental Water Pollutants" . | BIOSENSORS-BASEL 13 . 1 (2023) . |
APA | Mu, Yunyun , Liu, Miao , Li, Jiajun , Zhang, Xinping . Multifold Enhanced Raman Detection of Organic Molecules as Environmental Water Pollutants . | BIOSENSORS-BASEL , 2023 , 13 (1) . |
Export to | NoteExpress RIS BibTex |
Abstract :
We report nanoscale organic light-emitting diodes (OLEDs)arrangedperiodically into a large-area array, which produces an amplifiedemission with a selected spectrum in a narrow band. These nano-OLEDsshare a common active layer of super yellow light-emitting PPV copolymer(SY-PPV), which acts both as a waveguide and as a gain channel forthe light-emitting signals. The periodic structure supplies Bragg-likediffraction of the emission from SY-PPV under electrical excitationso that the electroluminescence signal is coupled into and confinedin the SY-PPV waveguide. During propagation, the waveguide resonancemode interacts with the nano-OLED region and gains amplification.Both the waveguide resonance mode and the output coupling processhave strong spectral selectivity, so that the amplification is observedwithin a spectrum as narrow as 32 nm at FWHM. Such a nano-OLED designnot only defines a new scheme of nano-OLEDs, but also proposes potentialapproaches for electrically pumped organic lasers.
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Wu, Wenwen , Liu, Yue , Zhang, Xinping . Selective Gain in a Periodic Array of Nano-organic Light-Emitting Diodes [J]. | JOURNAL OF PHYSICAL CHEMISTRY LETTERS , 2023 , 14 (34) : 7651-7657 . |
MLA | Wu, Wenwen et al. "Selective Gain in a Periodic Array of Nano-organic Light-Emitting Diodes" . | JOURNAL OF PHYSICAL CHEMISTRY LETTERS 14 . 34 (2023) : 7651-7657 . |
APA | Wu, Wenwen , Liu, Yue , Zhang, Xinping . Selective Gain in a Periodic Array of Nano-organic Light-Emitting Diodes . | JOURNAL OF PHYSICAL CHEMISTRY LETTERS , 2023 , 14 (34) , 7651-7657 . |
Export to | NoteExpress RIS BibTex |
Abstract :
Surface enhanced Raman scattering (SERS) spectroscopy is a widely used analytical technique for detecting chemicals or biological molecules with high sensitivity and high specificity. Enhancing the sensitivity and lowering the detection limits are always the working direction of this research field. Furthermore, direct detection of low-concentration molecules in liquids remains a big challenge. In this work, we construct a SERS device consisting of periodically arranged polylactic acid (PLA) lines that are coated with silver, where the PLA line array is produced by 3D printing technique. The plasmonic nanogroove within the gap between the two adjacent PLA lines is found to be the dominant mechanism for SERS detection. A maximum enhancement factor of 2.26 x 106 has been achieved for the plasmonic nanogroove, with respect to a pure planar glass substrate. A detection limit of lower than 0.5 ppm has been research for such a sensor device in the direct detection of melamine in its aqueous solution. Furthermore, the PLA lines have advantages of biodegradability, biocompatibility, low costs, and thermo-plasticity, making the device environmentally friendly in potential applications in food safety inspection and pollutant detection in water.
Keyword :
periodical array of PLA lines periodical array of PLA lines Plasmonic nanogrooves Plasmonic nanogrooves 3D printing 3D printing Melamine detection Melamine detection Surface-enhanced Raman scattering Surface-enhanced Raman scattering Fused deposition modeling (FDM) technology Fused deposition modeling (FDM) technology
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Li, Jiajun , Mu, Yunyun , Tao, Guanwei et al. Plasmonic nanogrooves for SERS sensing by 3D printing [J]. | APPLIED SURFACE SCIENCE , 2023 , 649 . |
MLA | Li, Jiajun et al. "Plasmonic nanogrooves for SERS sensing by 3D printing" . | APPLIED SURFACE SCIENCE 649 (2023) . |
APA | Li, Jiajun , Mu, Yunyun , Tao, Guanwei , Wu, Wenwen , Zhang, Xinping . Plasmonic nanogrooves for SERS sensing by 3D printing . | APPLIED SURFACE SCIENCE , 2023 , 649 . |
Export to | NoteExpress RIS BibTex |
Abstract :
Surface-enhanced Raman scattering (SERS) has been used for trace detection at the single-molecule level. The low-cost preparation of high-performance test strips has enabled the development of SERS techniques. In this study, oil-dispersible metal or alloy nanoparticles prepared by the Brust-Schiffrin method were used as "inks" in a ballpoint pen to handwrite SERS test strips on polytetrafluoroethylene (PTFE) membranes. Because of the good PTFE lipophilicity, the flexible substrates had good uniformity. The large laser damage threshold of the PTFE membrane also enabled increased laser powers for SERS testing. The Au and Ag alloy nanoparticle inks exhibited increased performance with larger proportions of Ag. The Au1Ag8 nanoparticles had the best properties, and those strips could detect 10(-11)-M Rhodamine 6G dyes in a 10-mu L volume with an enhancement factor of 5.4x10(8). The SERS strips were used to demonstrate detection of malachite green, the use of which is prohibited in aquaculture and fish tanks.
Keyword :
Surface-enhanced Raman scattering (SERS) Surface-enhanced Raman scattering (SERS) Localized surface plasmon resonance (LSPR) Localized surface plasmon resonance (LSPR) Flexible SERS substrates Flexible SERS substrates Au-Ag alloy nanoparticles Au-Ag alloy nanoparticles
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Tian, Honghao , Qin, Youjian , Liu, Hongmei et al. Flexible Surface-enhanced Raman Scattering Strips Using Colloidal Ink of Gold-silver Alloyed Nanoparticles [J]. | PLASMONICS , 2023 , 18 (4) : 1553-1559 . |
MLA | Tian, Honghao et al. "Flexible Surface-enhanced Raman Scattering Strips Using Colloidal Ink of Gold-silver Alloyed Nanoparticles" . | PLASMONICS 18 . 4 (2023) : 1553-1559 . |
APA | Tian, Honghao , Qin, Youjian , Liu, Hongmei , Li, Tian , Li, Yuting , Fang, Xiaohui et al. Flexible Surface-enhanced Raman Scattering Strips Using Colloidal Ink of Gold-silver Alloyed Nanoparticles . | PLASMONICS , 2023 , 18 (4) , 1553-1559 . |
Export to | NoteExpress RIS BibTex |
Abstract :
Organic semiconductors exhibit strong optical nonlinearity and can be utilized in optical modulation schemes. However, the response speed of such materials is limited by the lifetime of the largely delocalized pi-electrons, in particular for application in Kerr type optical switching devices. We report here a thin-film optical switch with a response time shorter than 300 fs in a single-layer poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(N,N '-diphenyl)-N,N '-di(p-butylphenyl)-1,4-diamino-benzene)] (PFB), where the unique band structure of PFB that allows strong transient two-photon absorption with high contrast is the main responsible mechanism. The exciton absorption from the bottom of the conduction band to the higher-lying bands is bleached through further excitation by the pump pulses, which induces charge dissociation on higher-lying excited states and largely enhances the contrast of the optical switching signal. The findings here not only supply new insights into the photoelectronics of the conventional polyfluorene semiconductors, but also explore new applications of such organic thin-film materials in nonlinear optics and optical modulation devices.
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Fu, Yulan , Wang, Jiawei , Zhang, Yiwei et al. A femtosecond optical switch using molecular two-photon absorption with multi-step charge dissociation [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2022 , 10 (17) : 6812-6817 . |
MLA | Fu, Yulan et al. "A femtosecond optical switch using molecular two-photon absorption with multi-step charge dissociation" . | JOURNAL OF MATERIALS CHEMISTRY C 10 . 17 (2022) : 6812-6817 . |
APA | Fu, Yulan , Wang, Jiawei , Zhang, Yiwei , Zhang, Xinping . A femtosecond optical switch using molecular two-photon absorption with multi-step charge dissociation . | JOURNAL OF MATERIALS CHEMISTRY C , 2022 , 10 (17) , 6812-6817 . |
Export to | NoteExpress RIS BibTex |
Export
Results: |
Selected to |
Format: |