巻号一覧
29 巻, 11 号
選択された号の論文の13件中1～13を表示しています
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植田 憲一2001 年 29 巻 11 号 p. 703
発行日: 2001/11/15
公開日: 2010/03/17
ジャーナル フリーPDF形式でダウンロード (161K) -
福村 裕史2001 年 29 巻 11 号 p. 704
発行日: 2001/11/15
公開日: 2010/03/17
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Steffen BAUDACH, Jörg KRÜGER, Wolfgang KAUTEK2001 年 29 巻 11 号 p. 705-709
発行日: 2001/11/15
公開日: 2010/03/17
ジャーナル フリーAblation of polymer films such as polyimide, polycarbonate, polyethylenterephthalate, polytetrafluoroethylene and polymethylmethacrylate were investigated with a Ti: sapphire laser system (150 fs, 800 nm). The single pulse threshold increased from 1.0 Jcm-2 of polyimide to 2.6 Jcm-2 of polymethylmethacrylate. This correlates with the increase of the optical band gap suggesting a multi-photon absorption mechanism. All polymers show incubation effects. A stronger incubation could be found for polycarbonate, polyethylenterephthalate, and polymethylmethacrylate in contrast to the “inert” polymers polyimide and polytetrafluoroethylene due to irreversible chemical alterations. All polymers except polyimide exhibited melting and the generation of vapour yielding swelling. Polyimide only sublimates and/or degrades. Ripples parallel to the electric field vector were generated with linear polarization of repeated laser pulses whereas circular polarization resulted in nanostructure arrays of the order of -100 nm.抄録全体を表示PDF形式でダウンロード (1786K) -
細川 陽一郎, 朝日 剛, 増原 宏2001 年 29 巻 11 号 p. 710-716
発行日: 2001/11/15
公開日: 2010/03/17
ジャーナル フリーA novel femtosecond laser etching and its mechanism of Cu-phthalocyanine solid were investigated by using fs (170 fs) and ns (100 ns) pulses of a 780 nm Ti: Sapphire laser. Above ablation thresholds, the depth etched by fs laser excitation becomes constant and is almost independent of laser fluence, while the depth etched by ns laser excitation increases gradually. We name the unique fs ablation phenomenon “discrete etching”. In order to reveal the evolutions from fs laser excitation to the nm etching, we measured directly excitation energy relaxation and surface morphology change with fs transient absorption spectroscopy and fs surface light scattering imaging, respectively. On the basis of the results, we propose a fs laser ablation model that ultrafast stress increase brings about mechanical disruption leading to the discrete etching behavior.抄録全体を表示PDF形式でダウンロード (1417K) -
2001 年 29 巻 11 号 p. 716-716,729
発行日: 2001/11/15
公開日: 2010/03/17
ジャーナル フリーPDF形式でダウンロード (596K) -
青木 裕之, 伊藤 紳三郎2001 年 29 巻 11 号 p. 717-721
発行日: 2001/11/15
公開日: 2010/03/17
ジャーナル フリーScanning near-field optical microscopy (SNOM) is an emerging scanning probe microscopic technique that enables one to carry out spectroscopic and time-resolved measurements with a sub-wavelength spatial resolution. We applied SNOM to investigate nanometric structures of polymer systems: 1) the phase separation structures of polymer blend monolayers, and 2) the structural inhomogeneity of polymer gels. The fluorescence imaging and time-resolved measurement of the energy transfer process in a local area revealed the assembly structures of polymer chains. In the two-dimensionally phase-separated polymer blend system, the phase interface was in the order of 100 nm, which was much larger than that for the three-dimensional system. The polymer gel has a hierarchic structure consisting of domains on scales of lOnm and 1μm. These findings showed that SNOM is a versatile technique to obtain molecular information on a mesoscopic/nanometric scale.抄録全体を表示PDF形式でダウンロード (1248K) -
川田 善正2001 年 29 巻 11 号 p. 722-725
発行日: 2001/11/15
公開日: 2010/03/17
ジャーナル フリーWe present the application of organic films as the detection system of near-optical microscopy. The optical field distribution is recorded as the topography of a photosensitive film, and the topographical distribution is detected with an atomic force microscope. This technique presents the possibility of a new type of near-field microscope without use of probe tips for illumination or detection of light. The observation result of a biological specimen is also presented.抄録全体を表示PDF形式でダウンロード (1056K) -
後藤 真宏, 岸本 牧, 福村 裕史2001 年 29 巻 11 号 p. 726-729
発行日: 2001/11/15
公開日: 2010/03/17
ジャーナル フリーFunctional organic molecules can be space-selectively implanted into polymer films by pulsed laser irradiation. This method has been developed for fabricating nano- and micro-scale fluorescent patterns on polymer surfaces. Two approaches employing scanning probe microscopy and conventional optical microscopy have been demonstrated. The former used a glass pipette having aperture of 100 nm, doped with fluorescent organic molecules at the tip. The distance between the tip and a polymer surface was controlled by a piezo driver to within a few tens of nanometer. Then nanosecond pulsed laser light was guided into the pipette with a glass fiber producing a nano-jet of organic molecules that is ejected towards the polymer surface, resulting in disklike implantation with a diameter of a few hundred nanometers. It was also demonstrated that a conventional microscope is useful to manufacture micro-scale patterns with functional organic molecules. This mechanism of the microscopic implantation is discussed based on experimental parameters affecting implantation size.抄録全体を表示PDF形式でダウンロード (874K) -
中村 收, 金子 智行2001 年 29 巻 11 号 p. 730-733
発行日: 2001/11/15
公開日: 2010/03/17
ジャーナル フリーDestructive effect induced by focused ultra-short pulsed laser has been used to perform micro-scale processing of metal or glass materials. Since the destructive effect is based on a multiphoton process and can be localized in the focusing area, the micro-processing can be performed with high three-dimensional resolution. We developed a laser processing system for laser surgery inside of living cells with the high spatial resolution, and monitored the response of the cells during laser surgery. In the experiment, we discovered that laser irradiation can induce physiological activities of cells. Focused laser light from a mode-locked Ti: Sapphire laser (780 nm, 80 fs, 82 MHz) irradiated HeLa cells loaded with fluorescence calcium indicator (fluo-4/AM). Soon after the irradiation, increase of the calcium concentration was seen around the focusing spot, then propagating to the entire cell. This result indicates that the increase of the calcium concentration was induced due to nonlinear optical process such as multiphoton absorption.抄録全体を表示PDF形式でダウンロード (1040K) -
Thomas LIPPERT, Christian DAVID, Marc HAUER, Claude PHIPPS, Alexander ...2001 年 29 巻 11 号 p. 734-738
発行日: 2001/11/15
公開日: 2010/03/17
ジャーナル フリーPhotopolymers based on triazene-groups were designed for UV laser ablation. The tested triazene-polymer reveals a low threshold fluence and unusually high ablation rates at low and high fluences. The polymer decomposes into gaseous products, resulting in clean ablation structures without surface contaminations. The triazene-polymer was also tested for two different applications at two different irradiation wavelengths, i.e. in the UV (308 nm) and in the near-IR (935 nm). Diffractive gray tone phase masks optimized for laser ablation were applied to fabricate microoptical elements. The triazene-polymereveals also superior properties for applications in the near-IR. Near-IR irradiation is used to create a plasma which could be used as thruster for microsatellites. The carbon-doped triazene-polymer shows higher values of the momentum coupling coefficient and specific impulse than a commercial polymer. The well-defined threshold for the maximum momentum coupling coefficient was only observed for the designed polymer.抄録全体を表示PDF形式でダウンロード (1486K) -
石田 昭人2001 年 29 巻 11 号 p. 739-743
発行日: 2001/11/15
公開日: 2010/03/17
ジャーナル フリーLocalised surface plasmon field around nanowells on gold film has been applied to enhance the fluorescence of BODIPY-dyes and Eu (TTF) 3 towards ultra-high throughput fluorescence analysis using nanowells integrated on a microtip. A 100 nm gold film with nanowells have been prepared on a 0.17 mm glass cover-slip by projection method using 500 nm or 1μm polystyrene spheres, and then fluorescence-stained with BODIPY-dyes or Eu (TTF) 3. The gold films have been excited by grazing illumination or by ATR using a 404 nm semiconductor laser. Both excitation methods gave remarkably enhanced fluorescence at the nanowells. The fluorescence image by ATR demonstrates that the surface plasmon field is strongly localised and scattered at the nanoholes giving comet-like spots.抄録全体を表示PDF形式でダウンロード (1448K) -
南出 泰亜, 川瀬 晃道, 今井 一宏, 佐藤 篤, 伊藤 弘昌2001 年 29 巻 11 号 p. 744-748
発行日: 2001/11/15
公開日: 2010/03/17
ジャーナル フリーWe demonstrate a widely tunable terahertz (THz) -wave parametric oscillator (TPO) in a ring cavity configuration using a novel frequency-tuning method involving rotating a single mirror forming the cavity. The TPO consisted of a nonlinear optical MgO: LiNbO3 crystal in a three-mirror ring cavity. We obtained continuous tuning of THz-wave in the 0.93 to 2.7 THz range by adjusting the mirror. The maximum THz-wave output of 69.6 pJ/pulse at 1.3 THz was coupled out from a single Si prism coupler. The absorption of HCl gas was measured in order to check the tuning controllability. The high performance of the TPO was confirmed from the transmission dip of the measured spectrum in agreement with the known center absorption lines.抄録全体を表示PDF形式でダウンロード (820K) -
兒玉 了祐2001 年 29 巻 11 号 p. 749
発行日: 2001/11/15
公開日: 2010/03/17
ジャーナル フリーPDF形式でダウンロード (166K)
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