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34 巻, 3 号
選択された号の論文の9件中1～9を表示しています
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川田 善正2006 年 34 巻 3 号 p. 218
発行日: 2006/03/15
公開日: 2014/03/26
ジャーナル フリーPDF形式でダウンロード (146K) -
市村 垂生, 井上 康志, 河田 聡2006 年 34 巻 3 号 p. 219-223
発行日: 2006/03/15
公開日: 2014/03/26
ジャーナル フリーTip enhanced near-field scanning optical microscopy and coherent anti-Stokes Raman scattering (CARS) spec-troscopy, a type of nonlinear Raman spectroscopy, have been successfully combined to image and analyze molecular distribution of nano-structures. Owing to the third order nonlinearity of the CARS process, the excitation of the CARS polarization is extremely confined to the end of the tip apex, resulting in high image contrast and high spatial resolution far beyond the diffraction limit of light. Our tip-enhanced CARS micro-scope visualized a deoxyribonucleic acid (DNA) network structure at a characteristic vibration-frequency (1337cm-1) in the fingerprint region with a spatial resolution of-15nm.抄録全体を表示PDF形式でダウンロード (3895K) -
岡本 裕巳, 井村 考平2006 年 34 巻 3 号 p. 224-229
発行日: 2006/03/15
公開日: 2014/03/26
ジャーナル フリーOptical properties of metal nanoparticles, especially gold nanorods in this review, are investigated by static and dynamic near-field microscopy and spectroscopy. We describe instrumentation for the dynamic near-field spectroscopy which enables less than 100-fs temporal resolution at the tip of the apertured near-field probe. We show that wavefunctions of the plasmon modes resonant with the incident light are imaged by near-field transmission imaging as well as by near-field two-photon induced photoluminescence measurements. We also show the results of the ultrafast near-field imaging of gold nanorods, where the dynamics after photoexcitation strongly depends on the position on the nanorod.抄録全体を表示PDF形式でダウンロード (10425K) -
斎木 敏治2006 年 34 巻 3 号 p. 230-235
発行日: 2006/03/15
公開日: 2014/03/26
ジャーナル フリーWe describe photoluminescence imaging spectroscopy based on a near-field scanning optical microscope (NSOM). By refining the design and fabrication method of a NSOM probe, the spatial resolution has been remarkably improved as high as 30nm. The resolution allows us to map out the wavefunction of an exciton confined in a large quantum dot. In this article we study a variety of quantum confinement structures: interface fluctuation GaAs quantum dots (QDs) with a typical size of 100nm, electrostatic field induced GaAs QDs of 500nm, and nitrogen clustering induced quantum confinement structures in GaNAs ranging from smaller than 30nm (the spatial resolution) to several hundreds nm. In the case of the interface QDs, the quantum energy spacing exceeds the thermal energy and therefore the wavefunctions of individual exciton states are success-fully visualized. In the other cases, since the interlevel energy spacings are rather small, we discuss our resultsin terms of local densities of states.抄録全体を表示PDF形式でダウンロード (10536K) -
二又 政之, 丸山 芳弘2006 年 34 巻 3 号 p. 236-240
発行日: 2006/03/15
公開日: 2014/03/26
ジャーナル フリーEnormous SERS (Surface Enhanced Raman Scattering) signal from dye on hot or blinking silver nanoparticles is extinguished by duration of measurement possibly due to thermal diffusion or desorption of adsorbed molecules. Simultaneously, elastic scattering peak at ca. 630nm disappeared. Three-dimensional Finite Difference Time Domain (FDTD-3D) method manifests this scattering peak originates from enhanced coupling of localized surface plasmon (LSP) on adjacent Ag particles through absorption of adspecies located at their junction. Distinct emission peaks were observed at 550-600nm and 600-750nm. Based on the spectral variations for different surface coverage and for different dye species, the shorter and longer wavelength peaks were attributed to excited electron on metal, and from fluorescence of molecules, respectively. Furthermore, we found the shorter wavelength peak shows invariant Stokes shift irrespective of excitation wavelengths, indicating it arises from inelastic scattering of excited electron by surface roughness or by adsorbed molecules.抄録全体を表示PDF形式でダウンロード (4150K) -
船津 高志2006 年 34 巻 3 号 p. 241-245
発行日: 2006/03/15
公開日: 2014/03/26
ジャーナル フリーRecent progress of the optical microscopy, especially the nearfield microscopy, has enabled us to study functions and interactions of protein molecules at single molecular level. Single molecule imaging has become an indispensable technique to life science research. On one hand, after the determination of the whole DNA sequences of human genome, the remained issues are elucidation of the functions of genes. Single-molecule imaging technique is expected to greatly contribute to such problems. Here, I review and survey the functional analysis of biomolecules by single-molecule imaging and manipulation.抄録全体を表示PDF形式でダウンロード (6210K) -
Effects of Ambient Temperature Change at the Optical CellNobuyoshi OHTANI, Masamori ENDO, Shigeru YAMAGUCHI, Kenzo NANRI, Tomoo ...2006 年 34 巻 3 号 p. 246-250
発行日: 2006/03/15
公開日: 2014/03/26
ジャーナル フリーThis paper discusses the precise measurement of NO2 concentrations in a sampled gas mixture using laser absorption spectroscopy. Pressurized NO2/N2 gas with known NO2 concentrations were used as sample gas mixtures. A frequency doubled Nd: YAG laser and mid-infrared (MIR) coherent light, using difference frequency generation techniques, were used to examine optical absorption by NO2. A relatively small change in temperature (ΔT-3K) at the optical multipass cell was found to vary the optical depth, particularly in a high concentration of NO2 mixture. This change is likely caused by a non-equilibrium dimerization effect between NO2 and N2O4 induced by the transient temperature non-uniformity of the gas mixture. Theoretical calculations and spectroscopic analysis suggest that careful consideration needs to be given to the stabilization of optical cell temperature, which is required to calibrate the laser absorption spectroscopic system for precise measurements of NO2 concentration.抄録全体を表示PDF形式でダウンロード (1572K) -
Lei CHEN, Shingo OISHI2006 年 34 巻 3 号 p. 251-254
発行日: 2006/03/15
公開日: 2014/03/26
ジャーナル フリーWe identify gases using terahertz time-domain spectroscopy (THz-TDS) in order to realize a short-range THz-Lidar. As the first step, pure rotational spectra of three organic gases (methanol, acetone and ethanol) were each measured by THz-TDS. THz waves are both generated and detected by photoconductive antenna. The frequency range of our THz system is from 0.1 to about 3 THz. According to our experimental results, we found strong absorptions caused by methanol gas and acetone gas, while ethanol gas showed no obvious absorption.抄録全体を表示PDF形式でダウンロード (734K) -
Lalit Bhushan SHARMA2006 年 34 巻 3 号 p. 255-256
発行日: 2006/03/15
公開日: 2014/03/26
ジャーナル フリーGeneration of continuous wave (cw) orange light at 590-nm by double-pass second harmonic generation (SHG) of a high-power 1180-nm Raman fiber laser with a 20-mm long bulk periodically poled MgO doped lithium niobate (PP-MgO: LN) is presented. The rear end-face of the crystal was polished at a small angle of 5.4 mrad for compensating relative phase shift between the fundamental and SH waves in double-pass configuration. With this technique, 1.2-W of cw orange laser radiation with conversion efficiency of 9.8 % and power stability of ±1.0 % recorded over a one-hour period has been achieved. For the same normalized pump linewidths, approximately 3.5-fold efficiency enhancement over the single-pass efficiency has been obtained with the double-pass SHG configuration.抄録全体を表示PDF形式でダウンロード (405K)
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