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Shear Force Detection Using Single—Tine Oscillating Tuning Fork for scanning near—field optical microscopy

Chinese Physics Letters 2003年第3期20卷 338-341页

作者：谭晓靖孙红三等 KeyLaboratoryofAtomicandMolecularNanosiciencesofEducationMinistryandDepartmentofPhysics TsinghuaUniversityBeijing100084 CAADLabortory TsinghuaUniversityBeijing100084

We propose a new method to detect near-field by using a single-tine oscillating tuning fork with mechanically asymmetric excitation that exhibits the sensitivity and stability better than that by using a double-tine oscillating one. Comparison of shear forces for the two methods demonstrate that the single-tine oscillating tuning fork provides a simpler and more sensitive method for near-field measurements. A theoretical analysis is presented for explanation to the greater sensitivity. The method is demonstrated by imaging a sparse-packed layer of micro-spheres in size of 200nm.

关键词： near field scanning optical microscopy

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Clustering study in Eu(DBM)_3Phen-doped polymer optical fibers by optical properties and near-field scanning microscopy

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Chinese Optics Letters 2005年第10期3卷 605-607页

作者：郑志强明海孙晓红谢建平 Department of Physics Fujian Normal University Fuzhou 350007 Department of Physics University of Science and Technology of China Hefei 230026

The clusters of Eu^3＋ ion in Eu（DBM）3Phen-doped polymethyl methacrylate （PMMA） have been studied by three means. The relative fluorescence intensity ratio of the ^5D0 → ^7F2 to ^5D0 → ^7F1 transitions with different concentrations of Eu^3＋ in Eu（DBM）3Phen-doped PMMA and metastable-state （^5D0） lifetime dependence on Eu^3＋ concentration axe analyzed. The analysis indicates that there axe no clustering effects in Eu^3＋ ions of Eu（DBM）3Phen-doped PMMA when the Eu^3＋ doping concentration is up to 1.0 wt.-%. At the same time, the clustering effect has not been observed by the scanning neax-field optical microscopy （SNOM） in Eu（DBM）3Phen-doped PMMA with 1.0 wt.-% of Eu^3＋ ions. The analysis reveals that a high concentration of Eu^3＋ can be incorporated into polymer optical fiber （POF） without clustering effect.

关键词： Concentration (process) Doping (additives) Fluorescence near field scanning optical microscopy optical properties Polymers Polymethyl methacrylates

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field enhancement analysis of an apertureless near field scanning optical microscope probe with finite element method

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Chinese Optics Letters 2007年第12期5卷 709-711页

作者： Weibin Chen Qiwen Zhan Electro-Optics Graduate Program University of Dayton 300 College Park Dayton Ohio 45469-0245 USA

Plasmonic field enhancement in a fully coated dielectric near field scanning optical microscope （NSOM） probe under radial polarization illumination is analyzed using an axially symmetric three-dimensional （3D） finite element method （FEM） model. The enhancement factor strongly depends on the illumination spot size, taper angle of the probe, and the metal film thickness. The tolerance of the alignment angle is investigated. Probe designs with different metal coatings and their enhancement performance are studied as well. The nanometric spot size at the tip apex and high field enhancement of the apertureless NSOM

关键词： field enhancement Finite element method Metrology near field scanning optical microscopy Polarization Rayleigh scattering

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Laser synthesis and functionalization of nanostructures

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International Journal of Extreme Manufacturing 2019年第1期1卷 38-50页

作者： Costas P Grigoropoulos Laser Thermal Laboratory Department of Mechanical EngineeringUniversity of California at Berkeley6129 Etcheverry HallBerkeley CA 94720-1740United States of America

This article summarizes work at the Laser Thermal Laboratory and discusses related studies on the laser synthesis and functionalization of semiconductor nanostructures and two-dimensional(2D)semiconductor *** has been carried out on the laser-induced crystallization of thin films and *** in situ transmission electron microscopy(TEM)monitoring of the crystallization of amorphous precursors in nanodomains is discussed *** directed assembly of silicon nanoparticles and the modulation of their optical properties by phase switching is *** vapor-liquid-solid mechanism has been adopted as a bottom-up approach in the synthesis of semiconducting nanowires(NWs).In contrast to furnace heating methods,laser irradiation offers high spatial selectivity and precise control of the heating mechanism in the time *** attributes enabled the investigation of NW nucleation and the early stage of nanostructure ***-and shape-selective,on-demand direct integration of oriented NWs was *** of discrete silicon NWs with nanoscale location selectivity by employing near-field laser illumination is also reported *** the properties of 2D transition metal dichalcogenides(TMDCs)by modulating the free carrier type,density,and composition can offer an exciting new pathway to various practical nanoscale *** situ Raman probing of laser-induced processing of TMDC flakes was conducted in a TEM instrument.

关键词： laser nanofabrication laser crystallization nanowire growth near field scanning optical microscopy transition metal dichalcogenides

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