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34 巻, 5 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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三澤 弘明2006 年 34 巻 5 号 p. 340
発行日: 2006/05/15
公開日: 2014/03/26
ジャーナル フリーPDF形式でダウンロード (203K) -
三澤 弘明2006 年 34 巻 5 号 p. 341-345
発行日: 2006/05/15
公開日: 2014/03/26
ジャーナル フリーPhotonic crystals are periodic dielectric microstructures highly regarded as the key element that will lead to breakthrough in optical technology and miniaturized optical devices, due to their unique capabilities in controlling the emission and propagation of light by means of their photonic band gap (PBG) effects. Microstructuring of 3D photonic crystals is not a trivial task, but is achievable using novel ultrafast laser microfabrication approach; namely the direct laser writing (DLW) and the multibeam interference technique. DLW works by tightly-focusing an ultrafast laser beam into a photosensitive material to directly record intended structures. Because of its intrinsic patterning capability, DLW is able to craft 3D photonic crystals based on the spiral architecture, which has very promising PBG properties, but is not amenable to fabrication by other techniques due to its complex profile. Multibeam interference works by splitting an ultrashort pulsed laser into several beams and creating an interference pattern from these splitted beams, which is then transferred onto a photosensitive material. Its strength lies in the ability to structure 2D/3D photonic crystals over a large area (-millimeter order) within several minutes timeframe.抄録全体を表示PDF形式でダウンロード (11232K) -
納富 雅也, 倉持 栄一, 新家 昭彦, 田辺 孝純2006 年 34 巻 5 号 p. 346-352
発行日: 2006/05/15
公開日: 2014/03/26
ジャーナル フリーWe report recent progress in two-dimensional Si photonic crystal slab structures. First, we demonstrate our successful propagation-loss reduction for single-mode photonic-crystal waveguides and clarify the physical origin of scattering loss mechanisms. Second, we show several designs for improving cavity-Q of photoniccrystal resonators, and describe how to couple them to waveguides. Finally, we demonstrate all-optical bistable switching using these resonator-waveguide coupled systems and discuss their applicability to all-optical digital logical processing.抄録全体を表示PDF形式でダウンロード (11483K) -
藤方 潤一, 石 勉, 柳沢 雅広, 大橋 啓之2006 年 34 巻 5 号 p. 353-357
発行日: 2006/05/15
公開日: 2014/03/26
ジャーナル フリーWe reviewed on the enhanced photon-tunneling and the near-field enhancement effect for a metallic nanoscale aperture with a concentric surface plasmon resonance structure. About two-orders larger light transmission and an enhanced near-field were achieved by optimizing the grating structures. This enhanced near-field was applied to optical recording, and about 100-nm recorded patterns were successfully made on phase change media. This surface plasmon optics would open up the ultra-high-density recording technology.抄録全体を表示PDF形式でダウンロード (13558K) -
岡本 隆之2006 年 34 巻 5 号 p. 358-362
発行日: 2006/05/15
公開日: 2014/03/26
ジャーナル フリーPlasmonic crystals, which are periodically corrugated noble metal surfaces, are described. The dispersion relation of plasmonic crystals provides bandgap structures, called plasmonic bandgaps. At the edge of the bandgap surface plasmons are laterally confined as standing waves. Due to this effect the power of the emitted fluorescence is enhanced and lasing action is expected. A thin metal film structure is proposed for lasing, in which absorption loss is reduced due to long-range surface plasmons and radiation loss is reduced by modifying the surface profile of the metal film.抄録全体を表示PDF形式でダウンロード (9604K) -
古海 誓一2006 年 34 巻 5 号 p. 363-368
発行日: 2006/05/15
公開日: 2014/03/26
ジャーナル フリーOn the basis of our research, this report describes the recent progress on mirrorless laser action induced by photonic band-gaps (PBGs) of chiral liquid crystals (CLCs). Liquid crystal compounds with molecular chirality self-organize the supramolecular helical structure by their twisting power. Therefore, we can observe the selective reflection band regarding as 1-D PBG. When the fluorescent dye-doped CLC is optically excited with a linearly polarized beam, the laser emission appears at the chiral 1-D PBG edge (s) of CLC hosts. The optically pumped laser emission shows circularly polarized characteristic, even though the excitation beam is linearly polarized. Applying voltages to the optically pumped CLC cells enables reversible switching of the laser action as a result of changes in the supramolecular helical structure of CLC host. Moreover, we succeed in the phototunable laser emission from the photosensitive CLC.抄録全体を表示PDF形式でダウンロード (3732K) -
金井 大造, 鈴木 幸子, 吉橋 幸子, 石井 克典, 粟津 邦男2006 年 34 巻 5 号 p. 369-373
発行日: 2006/05/15
公開日: 2014/03/26
ジャーナル フリーThe Free Electron Laser (FEL) at the Institute of the Free Electron Laser, Osaka University (iFEL) can be continuously varied between 5.0-20.0mm. The FEL has a double pulse structure. The FEL consists of macropulses with a 15ms pulse width. Each macropulse contains 330 micropulses with a 5 ps pulse width. The tunability of the FEL affords new medical applications such as the investigation of protein dynamics and the ablation of biomedical tissues. To investigate the non-thermal effects of the FEL, a pulse control system using an acousto-optic modulator (AOM) was developed. This system can control the FEL macropulse width (180ns∼15ms) and the output with a very good efficiency (60%). A phosphorylated protein was irradiated with a specific pulse FEL. The results confirmed that the pulse width can control the thermal effects. This system should be a novel tool for investigating the interaction between the FEL and biological molecules.抄録全体を表示PDF形式でダウンロード (955K) -
佐伯 拓, 今崎 一夫, 本越 伸二, 内田 成明, 藤田 尚徳, 中塚 正大, 井澤 靖和, 山中 千代衛2006 年 34 巻 5 号 p. 374-378
発行日: 2006/05/15
公開日: 2014/03/26
ジャーナル フリーWe observed laser oscillation for a multimode Nd-doped solid-state clad laser under quasi-solar-pumping simulated by an intense metalhalyde lamp with a color temperature of 5600 Kelvins. The rod was 3mm in diameter and 10cm in length. We obtained a maximum output peak power of 1.1W, where the injected power of the lamplight was 12.5W and the maximum optical-optical conversion efficiency obtained by reducing thermal load was 20% in the case of the rod-type Nd/Cr: GSGG抄録全体を表示PDF形式でダウンロード (860K) -
安平 光雄, 宮本 克彦, 伊藤 弘昌2006 年 34 巻 5 号 p. 379-381
発行日: 2006/05/15
公開日: 2014/03/26
ジャーナル フリーTo detect THz waves, devices that can operate in ultra-low-temperature liquid He are needed in order to suppress thermal noise. We fabricated a simple detection device composed of a thermal sensor of Poly-Si silicided with Ni, a dummy sensor, and a CMOS circuit comparator that is compatible with 0.13-μm CMOS process technology; this is a basic construction for a two-dimensional detection device array. Stable operation of the device in liquid He at a temperature of 5K was confirmed, and using a KTP-OPO source thermal-electrical transformation was observed with a minimum irradiation energy 20μJ/pulse. These results are expected to lead to an overlayed two-dimensional detection device array composed of a CMOS sensor with suitable noise suppression and signal processing features and a thermal sensor.抄録全体を表示PDF形式でダウンロード (3037K)
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