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Zhang J, Zhao H, Gong M, Zhang L, Yan Z, Xie K, Fei G, Zhu X, Kong M, Zhang S, Zhang L, Lei Y. Revealing the truncated conical geometry of nanochannels in anodic aluminium oxide membranes. NANOSCALE 2022; 14:5356-5368. [PMID: 35293409 DOI: 10.1039/d2nr01006b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Anodic aluminium oxide (AAO) membranes with self-ordered nanochannels have become promising candidates for applications in the aspects such as structural coloration, photonic crystals, upconversion luminescence and nanofluidic transport. Also, self-ordered AAO membranes have been extensively used for the fabrication of functional nanostructures such as nanowires, nanotubes, nanoparticles, nanorods and nanopillars. Geometries of nanochannels are crucial for the applications of AAO membranes as well as controlling growth (e.g., nucleation, direction and morphology) and in applications (e.g., optics, magnetics, thermoelectrics, biology, medicine, sensing, and energy conversion and storage) of the functional nanostructures fabricated via AAO template-based methods. However, observation of whole nanochannels with nanometer-resolution in thick AAO membranes remains a fundamental challenge, and the nanochannel geometry has not yet been sufficiently elucidated. Here, for the first time, we use depth-profiling transmission electron microscopy to reveal the truncated conical geometry of whole nanochannels of 70 μm in length. Such shape nonuniformity of the nanochannels leads to different reflectance properties of the different depths of the nanochannels along their long axis for one AAO membrane, which suggests that the nonuniformity result in some effects on applications of the nanostructures. Furthermore, we introduce a shape factor to evaluate the shape nonuniformity and demonstrate that the nonuniformity can be remarkably removed by an effective etching method based on a temperature gradient regime.
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Affiliation(s)
- Junxi Zhang
- School of Instrument Science and Opto-electronics Engineering, Anhui Key Laboratory of Advanced Functional Materials and Devices, and Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, Hefei University of Technology, Hefei 230009, China.
| | - Huaping Zhao
- Institute of Physics & IMN MacroNano, Ilmenau University of Technology, Ilmenau 98693, Germany.
| | - Ming Gong
- Laboratory of Engineering and Material Science, University of Science and Technology of China, Hefei 230027, China
| | - Lide Zhang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Zhijun Yan
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Kang Xie
- School of Opto-Electronic Engineering, Zaozhuang University, Zaozhuang 277160, Shandong, China
| | - Guangtao Fei
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Xiaoguang Zhu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Mingguang Kong
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Shuyuan Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China
| | - Lin Zhang
- Aston Institute of Photonic Technologies, School of Engineering & Applied Science, Aston University, Birmingham B4 7ET, UK
| | - Yong Lei
- Institute of Physics & IMN MacroNano, Ilmenau University of Technology, Ilmenau 98693, Germany.
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Yao LH, Zhang JP, Dai HW, Wang MS, Zhang LM, Wang X, Han JB. Plasmon-enhanced versatile optical nonlinearities in a Au-Ag-Au multi-segmental hybrid structure. NANOSCALE 2018; 10:12695-12703. [PMID: 29946608 DOI: 10.1039/c8nr02938e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A Au-Ag-Au multi-segmental hybrid structure has been synthesized by using an electrodeposition method based on an anodic aluminum oxide (AAO) membrane. The third-order optical nonlinearities, second harmonic generation (SHG) and photoluminescence (PL) properties containing ultrafast supercontinuum generation and plasmon mediated thermal emission have been investigated. Significant optical enhancements have been obtained near surface plasmon resonance wavelength in all the abovementioned nonlinear processes. Comparative studies between the Au-Ag-Au multi-segmental hybrid structure and the corresponding single-component Au and Ag hybrid structures demonstrate that the Au-Ag-Au multi-segmental hybrid structure has much larger optical nonlinearities than its counterparts. These results demonstrate that the Au-Ag-Au hybrid structure is a promising candidate for applications in plasmonic devices and enhancement substrates.
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Affiliation(s)
- Lin-Hua Yao
- Wuhan National High Magnetic Field Center and Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.
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Ma ZW, Chi C, Yu Y, Zhong ZQ, Yao LH, Zhou ZK, Wang X, Han YB, Han JB. Near-UV-enhanced broad-band large third-order optical nonlinearity in aluminum nanorod array film with sub-10 nm gaps. OPTICS EXPRESS 2016; 24:5387-5394. [PMID: 29092362 DOI: 10.1364/oe.24.005387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Plasmonic nanostructures with sub-10 nm gaps possess intense electric field enhancements, leading to their high reputation for exploring various functional applications at nanoscale. Till now, although large amounts of efforts have been devoted into investigation of such structures, few works were emphased on the nonlinear optical properties in near-ultraviolet (UV) region. Here, by combining sputtering technique and an optimized anodic aluminum oxide (AAO) template growing method, we obtain aluminum (Al) nanorod array film (NRAF) with average rod diameter and gap size of 50 and 7 nm, respectively. The Al-NRAF exhibits large third-order optical nonlinear susceptibility (χ(3)) and high figure of merit (χ(3)/α) over a broad wavelength range from 360 to 900 nm, and reaches their maximums at the shortest measured wavelength. In addition, comparisons with Au-NRAF and Ag-NRAF samples further confirm that Al-NRAF has better nonlinear optical properties in the blue and near-UV wavelength regions. These results indicate that Al nanostructures are promising candidates for nonlinear plasmonic applications at blue and near-UV wavelengths.
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Aydogan A, Koca A, Şener MK, Sessler JL. EDOT-Functionalized Calix[4]pyrrole for the Electrochemical Sensing of Fluoride in Water. Org Lett 2014; 16:3764-7. [DOI: 10.1021/ol501635s] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Abdullah Aydogan
- Department
of Chemistry, Istanbul Technical University, Maslak, Istanbul 34469, Turkey
| | - Atıf Koca
- Department
of Chemical Engineering, Marmara University, Kadıköy, Istanbul 34722, Turkey
| | - M. Kasım Şener
- Department
of Chemistry, Yıldız Technical University, Davutpaşa, Istanbul 34210, Turkey
| | - Jonathan L. Sessler
- Department
of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
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Yan L, Si J, Yan Y, Chen F, Hou X. Pump power dependence of femtosecond two-color optical Kerr shutter measurements. OPTICS EXPRESS 2011; 19:11196-11201. [PMID: 21716348 DOI: 10.1364/oe.19.011196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigated the pump power dependence of femtosecond two-color optical Kerr shutter (OKS) signals, which showed a damped sinusoidal variation with increasing pump power. The sinusoidal dependence was attributed to the polarization rotation caused by light-induced birefringence effect. The numerical analysis indicated that, the damping of OKS signal intensity could be attributed to the temporal profile change of probe pulse passing through the OKS setup, due to the non-uniform transient refractive index change induced by pump pulse. Because of the large phase shift of probe pulse, the time-resolved OKS signals showed modulated temporal intensity when pump power was increased.
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Affiliation(s)
- Lihe Yan
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Laboratory of Information Photonic Technique, School of Electronics & information Engineering, Xi'an Jiaotong University, Xi'an, China
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