The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 40, Issue 8
Topical Papers on the Cutting Edge of Ultrafast Dynamic Imaging Technology on Solid Surface
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Topical Papers on the Cutting Edge of Ultrafast Dynamic Imaging Technology on Solid Surface
Topical Paper
Laser Review
  • Preface to Topical Papers on the Cutting Edge of Ultrafast Dynamic Imaging Technology on Solid Surface
    Katsuya OGURI
    2012 Volume 40 Issue 8 Pages 562-
    Published: 2012
    Released on J-STAGE: July 31, 2020
    DOIhttps://doi.org/10.2184/lsj.40.8_562
    JOURNAL FREE ACCESS
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  • Imaging of Transient Carrier Dynamics in Semiconductors by Nanoscale Pump-Probe Microscopy
    Shoji YOSHIDA, Osamu TAKEUCHI, Hidemi SHIGEKAWA
    2012 Volume 40 Issue 8 Pages 565-
    Published: 2012
    Released on J-STAGE: July 31, 2020
    DOIhttps://doi.org/10.2184/lsj.40.8_565
    JOURNAL FREE ACCESS
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    We realized real space imaging of transient carrier dynamics by combining ultrashort pulse laser technology with scanning tunneling microscopy (STM). The new microscopy, called shaken-pulse-pair excited STM (SPPX-STM), simultaneously has the temporal resolution of ultrashort laser pulse width and the spatial resolution of STM. We successfully imaged carrier dynamics in semiconductors with nanoscale structures in real space by the new microscopy techniques.
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  • Near-Field Optical Microscopy of Localized Surface Plasmons Excited in Noble Metal Nanostructures
    Kohei IMURA, Hiromi OKAMOTO
    2012 Volume 40 Issue 8 Pages 571-
    Published: 2012
    Released on J-STAGE: July 31, 2020
    DOIhttps://doi.org/10.2184/lsj.40.8_571
    JOURNAL FREE ACCESS
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    Scanning near-field optical microscope is able to achieve a nanometer spatial resolution, and is useful for visualization of elementary excitations in nanomaterials. Combination of the near-field optical microscope with the time-resolved spectroscopy enables us to visualize spatio-temporal behaviors of the excited states. We apply this imaging technique to the studies of static and dynamic optical properties of single gold nanorods. The static near-field image of a single gold nanorod shows a periodic oscillation along the long axis of the nanorod, and is attributed to a plasmon mode resonantly excited. The dynamic near-field image of the nanorod shows a characteristic spatial feature, which is very different from that of the static image. We discuss the origin of the dynamic near-field image, and the image is assigned to variations of plasmon modes induced by the photo-excitation. We also discuss the future prospect of the dynamic near-field microscopy and its applications to fundamental studies on plasmonic materials.
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  • Ultrafast Dynamics of Photo-Excited Nano-Structured Metal Surfaces by Femtosecond Time-Resolved Photoemission Electron Microscopy
    Atsushi KUBO
    2012 Volume 40 Issue 8 Pages 579-
    Published: 2012
    Released on J-STAGE: July 31, 2020
    DOIhttps://doi.org/10.2184/lsj.40.8_579
    JOURNAL FREE ACCESS
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    Photoemission electron microscopy (PEEM) employing phase-correlated femtosecond pulse pairs enables to investigate ultrafast dynamics of photo-excited nanostructured metals, where anomalous local fi eld enhancements are induced accompanied with surface plasmon resonances. Surface plasmon modes with specific coherence times and eigen frequencies possess their individual time evolutions of amplitudes, phases, and shapes of oscillatory motions, which are visualized by the time-resolved PEEM method. As well as the localized surface plasmon modes, propagating surface plasmon polaritons (SPPs) are also investigated through imaging of surface polarization beats established by SPP-light interferences.
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  • Magneto-Optic Imaging of Electron-Spin Dynamics in Semiconductors Modulated by Surface Acoustic Waves
    Haruki SANADA, Hideki GOTOH, Koji ONOMITSU, Tetsuomi SOGAWA
    2012 Volume 40 Issue 8 Pages 587-
    Published: 2012
    Released on J-STAGE: July 31, 2020
    DOIhttps://doi.org/10.2184/lsj.40.8_587
    JOURNAL FREE ACCESS
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    The magneto-optic imaging technique is a powerful tool for visualizing electron spin dynamics in semiconductors. We employed time- and spatially-resolved magneto-optic Kerr measurements to investigate spin transport with dynamic dots, which are produced by surface acoustic waves (SAWs) propagating in GaAs/AlGaAs quantum wells. Two-dimensional images of the electron spin flow reveal acoustically controllable spin precession behavior. The phenomena will provide the flexibility needed for spin manipulation in future spintronics applications.
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  • Imaging of Ablation Dynamics by Soft X-Ray Laser
    Takuro TOMITA, Noboru HASEGAWA, Masaharu NISHIKINO, Tetsuya KAWACHI, T ...
    2012 Volume 40 Issue 8 Pages 592-
    Published: 2012
    Released on J-STAGE: July 31, 2020
    DOIhttps://doi.org/10.2184/lsj.40.8_592
    JOURNAL FREE ACCESS
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    A single-shot soft x-ray laser pulse was used as a probe to investigate the early stage of the laser ablation process on platinum caused by the femtosecond near-infrared pump pulse. From time-resolved interferometry, we observed the dilation of the ablation front on a scale of 10 nm in the picosecond region. In the refl ective imaging, we found three distinct types of dynamical responses, depending on the radial position in the pump beam spot. These characteristic behaviors correspond to different laser fluence and were attributed to different ablation schemes: spallation, homogeneous nucleation, and fragmentation/vaporization, which have been predicted from molecular dynamics simulation.
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  • Single-Shot Time-Frequency Imaging of Ultrashort Laser Pulses and Phonon-Polariton Propagation in Ferroelectric Materials
    Jun TAKEDA, Ikufumi KATAYAMA
    2012 Volume 40 Issue 8 Pages 598-
    Published: 2012
    Released on J-STAGE: July 31, 2020
    DOIhttps://doi.org/10.2184/lsj.40.8_598
    JOURNAL FREE ACCESS
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    We have demonstrated single-shot time-frequency imaging spectroscopy with an echelon mirror to measure ultrashort laser pulses as well as the phonon-polariton propagation of ferroelectric materials using the same optical setup. Since the echelon mirror has a micro-step structure and produces a spatially encoded time delay for the probe pulse, both the pump and probe pulses are focused on samples with small spot size. Using an SHG or optical Kerr gate apparatus, we successfully mapped the timefrequency images of ultrashort laser pulses and subsequently obtained the chirp characteristics using the phase-retrieval procedure on a single-shot basis. By simply replacing a nonlinear crystal (or a Kerr medium) with actual samples, we could also visualize the phonon-polariton propagation of ferroelectric LiNbO3.
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Laser Original
  • Imaging of Surface Plasmon Polaritons Using Femtosecond Laser Excited Two-Photon Fluorescence Microscopy
    Tatsumi HATTORI, Atsushi KUBO, Katsuya OGURI, Hidetoshi NAKANO, Hideki ...
    2012 Volume 40 Issue 8 Pages 603-
    Published: 2012
    Released on J-STAGE: July 31, 2020
    DOIhttps://doi.org/10.2184/lsj.40.8_603
    JOURNAL FREE ACCESS
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    We demonstrate imaging of surface plasmon polaritons (SPPs) on a silver film using a two-photon fluorescence microscopy technique. Surface plasmon waves launched from an edge of a silver film under a light irradiation of 11-fs near-infrared laser pulses promote formation of intensity beats in nearfi elds through SPP-light interference. Dye molecules embedded in a thin PMMA layer on a silver fi lm up-convert the near-infrared surface fi elds to propagating lights in visible range through a two-photon excitation, which enables to image the near-fi elds with using a conventional optical microscope. The wavelength of SPP determined from the beat wavelength of near-fi elds agrees well with an evaluation using dielectric properties of sample materials and the dispersion relation of SPP.
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Regular Paper
Laser Review
  • Power Photonics for Green Earth- Strategic Approach to the Better Life -
    Sadao NAKAI
    2012 Volume 40 Issue 8 Pages 610-
    Published: 2012
    Released on J-STAGE: July 31, 2020
    DOIhttps://doi.org/10.2184/lsj.40.8_610
    JOURNAL FREE ACCESS
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    We have investigated the pathway to the Laser Fusion Energy (LFE) as the primary energy for the society, which is essentially important for the Green Earth. The next step toward the fusion power plant is the engineering development of the elements for the LFE and their integration. The integrated system development will open new applications to the sciences and the industries in a wide range of fields such as high energy density physics, manufacturing, nuclear material processing, space, and medical engineering with the high-repetition high-power lasers suitable for industrial uses.
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