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34 巻, 11 号
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野田 進2006 年 34 巻 11 号 p. 735
発行日: 2006/11/15
公開日: 2014/03/26
ジャーナル フリーPDF形式でダウンロード (127K) -
大西 大, 野田 進2006 年 34 巻 11 号 p. 736-739
発行日: 2006/11/15
公開日: 2014/03/26
ジャーナル フリーWe report on unique surface-emitting two-dimensional photonic-crystal lasers with the capability of not only single-mode lasing oscillation in a broad area but also generation of various beam shapes. More than 50×50 u m coherent lasing oscillation has been successfully achieved, and doughnut-shaped and single-lobed beams have been produced by engineering photonic-crystal structures. In addition, we achieved the record highest light-output power (46 mW) of a surface-emitting laser in CW condition at room temperature. These results indicate the realization of a completely new semiconductor laser.抄録全体を表示PDF形式でダウンロード (6225K) -
杉立 厚志, 野田 進2006 年 34 巻 11 号 p. 740-744
発行日: 2006/11/15
公開日: 2014/03/26
ジャーナル フリーWe demonstrate a room temperature operation of a two-dimensional photonic-crystal line defect laser with an InGaAsP multiple-quantum well active layer. It is shown that the lasing oscillation occurs at the mode edge of the line-defect-waveguide. It is also demonstrated that the device has a broad range of tunability (80 nm) in lasing wavelength, merely by changing a very small width (40 nm) of the waveguide. This magnitude of the tunability is much larger than that of a conventional distributed feedback laser. This remarkable property originates from the nature of two-dimensional periodicity. We also realize a two-dimensional photonic crystal laser with a combination of line defects and point defects, which achieves vertical laser emission from the point defect, based on the same nature of two-dimensional periodicity.抄録全体を表示PDF形式でダウンロード (13010K) -
古川 昭夫2006 年 34 巻 11 号 p. 745-748
発行日: 2006/11/15
公開日: 2014/03/26
ジャーナル フリーApproaches for controlling the lateral mode of vertical cavity surface emitting lasers by photonic crystal like structures are reviewed. Both the holey fiber structure and the triangular hole structure has been reported to be effective in enlarging the emission area of single lateral mode oscillation. Although the resulting optical power is limited so far, the capability of in-phase evanescent coupling between multiple cavities by the hole arrangement gives potential for realizing a high power, single coherent light source.抄録全体を表示PDF形式でダウンロード (905K) -
荒川 泰彦, 臼杵 達哉, 岩本 敏, 加古 敏2006 年 34 巻 11 号 p. 749-755
発行日: 2006/11/15
公開日: 2014/03/26
ジャーナル フリーIn this article, recent advances in single photon source technologies based on semiconductor quantum dots are reviewed. After brief overview of progress in quantum dot photonic devices, we address various issues on single photon sources for practical applications, such as operation of the devices at telecommunication wavelength, higher temperature and highly efficient emission. To solve these issues, quantum dots embedded in photonic crystal and GaN-based quantum dots are discussed, demonstrating impact of the quantum dots on single photon source technologies.抄録全体を表示PDF形式でダウンロード (1551K) -
野崎 謙悟, 馬場 俊彦2006 年 34 巻 11 号 p. 756-760
発行日: 2006/11/15
公開日: 2014/03/26
ジャーナル フリーWe demonstrate the laser operation by an ultrasmall mode in photonic crystal (PC) and quasiperiodic photonic crystal (QPC) nanocavities fabricated into GaInAsP slab. In the former, the smallest modal volume of 0.019 μm3 =0.15 (λ/n) 3 is achieved by using a PC point-shift nanocavity. In the latter, as well as the nanocavity mode lasing, unique localization of Bragg modes arising from fractal lattices of the QPC is observed. These nanocavities are effective for the enhancement of the spontaneous emission rate (so-called Purcell effect). The time-resolved measurement shows 28 times faster spontaneous emission decay in the point-shift nanocavity.抄録全体を表示PDF形式でダウンロード (11150K) -
冨士田 誠之, 野田 進2006 年 34 巻 11 号 p. 761-766
発行日: 2006/11/15
公開日: 2014/03/26
ジャーナル フリーWe discuss an ultimate light-emission control method by using a two-dimensional photonic bandgap. Calculations predict that a spontaneous emission coupled to the slab modes, which is strongly confined within the slab plane, is inhibited. The saved energy efficiently becomes a spontaneous emission that is coupled to the vertical modes. Controlling the spontaneous emission is experimentally demonstrated by measuring timeresolved photoluminescence spectra from GaInAsP quantum-well samples. The suppression of non-radiative processes that compete the spontaneous emission is achieved by the introduction of InAs quantum dots, which can confine carriers in three dimensions. An artificial point-defect cavity introduced in the photonic crystal can lead to a cavity-mode emission at an extremely low excitation density. Our results demonstrate the realization of an ideal two-dimensional photonic-bandgap environment, and open up possibilities for various applications of photonic crystals using spontaneous-emission phenomena.抄録全体を表示PDF形式でダウンロード (8098K) -
北村 雅季, 岩本 敏, 荒川 泰彦2006 年 34 巻 11 号 p. 767-772
発行日: 2006/11/15
公開日: 2014/03/26
ジャーナル フリーPhotonic crystals (PCs) have attracted considerable attention because of their wide range of applications to nanoscale photonic devices. In this article, we review and show applications of PCs to organic light-emitting devices. One of the applications is the improvement of light-extraction efficiency of organic light-emitting diodes (OLEDs). Electroluminescence spectra of OLEDs with a PC depend on the PC structure, in particular, the lattice constant of the PC. Design of a PC with specific lattice constant and its subsequent incorporation into an OLED can improve the light-extraction efficiency. The other application considered is that of photonic nanocavities emitting in the visible-light range. Such nanocavities have been demonstrated using air-bridge photonic crystal based on organic materials, and are reviewed here. Results showing the possibility of chemical sensors using nanocavities are also presented.抄録全体を表示PDF形式でダウンロード (11557K) -
井澤 友策, 時田 茂樹, 橋田 昌樹, 藤田 雅之, 井澤 靖和2006 年 34 巻 11 号 p. 773-778
発行日: 2006/11/15
公開日: 2014/03/26
ジャーナル フリーFemtosecond laser processing has been providing attractive applications, because it enables us to realize socalled non-thermal laser-matter interaction. It is important to characterize the laser fluence dependence of the interaction process. It is well known that the femtosecond laser irradiation to c-Si (single-crystalline Si) can induce ablation and phase transition from c-Si to a-Si (amorphous Si). We investigated the ultra-fast interaction between laser and c-Si by means of Pump-Probe technique. The results showed three interaction regions: ablation, non-thermal melting, and thermal melting with decreasing of laser fluence. In this paper, we describe the time scale of each process and their laser fluence dependences.抄録全体を表示PDF形式でダウンロード (13794K) -
吉田 英次, 住村 和彦, 椿本 孝治, 藤田 尚徳, 中塚 正大2006 年 34 巻 11 号 p. 779-782
発行日: 2006/11/15
公開日: 2014/03/26
ジャーナル フリーWe have demonstrated the generation of optional pulse shape by Yb doped fiber laser system. Yb fiber laser system operated the polarization-maintained pulsed at 1064 nm for single-transverse and -longitudinal mode using fiber Bragg grating (FBG), and this system generates optional pulse shapes that sliced up the Yb fiber oscillator by a LN (LiNbO3) intense modulator with 12.5-GHz bandwidth. The developed electronic-pulseshape generator supplies an arbitrary-voltage pulse to an integrated optic LN amplifier modulator which modulates the laser pulse. The output laser waveforms can obtain corresponding to the electronic waveforms such as rectangular, Gaussian and multi pulses with a 300-ps resolution.抄録全体を表示PDF形式でダウンロード (4374K) -
Shiho HAKOMORI, Sayaka OHMORI, Tsunenori ARAI2006 年 34 巻 11 号 p. 783-785
発行日: 2006/11/15
公開日: 2014/03/26
ジャーナル フリーIn order to evaluate Photodynamic Therapy (PDT) internal energy kinetics with pulsed excitation, we constructed an experimental setup combining time gate and spectroscopic separation factors in order to obtain the time-resolved phosphorescence waveform from the clinical photosensitizers at the spectral peak. We employed a fast optical shutter as the time gate, and a monochrometer as the spectroscopic separation factor to cut off high intensity fluorescence. We also verified the lifetime and spectrum of the measured luminescence. We subsequently concluded that we had successfully obtained the time-resolved phosphorescence waveform from Talaporfin sodium (NPe6). We believe that the behavior of the photosensitizer fluorescence and the singlet oxygen fluorescence are within reason from the point of the view of the energy flow as determined in PDT kinetics.抄録全体を表示PDF形式でダウンロード (696K)
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