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Volume 49, Issue 6
Preface to Special Issue on New Optical Science Pioneered by Young Scientists
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Preface to Special Issue on New Optical Science Pioneered by Young Scientists
Special Issue
Laser Review
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Ken-ichi UEDA2021 Volume 49 Issue 6 Pages 314-
Published: 2021
Released on J-STAGE: April 11, 2024
JOURNAL FREE ACCESSThe strategy and philosophy of our JST PRESTO program based for the advanced optical science are briefly introduced herein. How to develop the closed coupled academic community covering the various scientific background, physics, chemistry, biology and medicine, it has been an exciting activity between a retired professor and young scientists since 2015.View full abstractDownload PDF (927K) -
Takayuki IWASAKI2021 Volume 49 Issue 6 Pages 317-
Published: 2021
Released on J-STAGE: April 11, 2024
JOURNAL FREE ACCESSQuantum emitters in diamond are a promising candidate for quantum network applications. Here, we show basic properties of tin-vacancy (SnV) centers in diamond, which we recently discovered. The SnV center shows a sharp zero phonon line and a high fluorescence intensity. The SnV center has a possibility to have a long spin coherence time in the Kelvin temperature range, in contrast to other group-IV color centers, i.e. silicon-vacancy and germanium-vacancy centers. We discuss important experiments regarding spin and optical properties of the SnV quantum emitter for further development towards quantum network.View full abstractDownload PDF (463K) -
[in Japanese]2021 Volume 49 Issue 6 Pages 321-
Published: 2021
Released on J-STAGE: April 11, 2024
JOURNAL FREE ACCESSIncoherent digital holographic techniques and its visions are described. Applicability of wavelength- multiplexed incoherent digital holography to single-shot motion-picture holography for moving objects, compact, lensless, and multiwavelength 3D imagers, and multiband 3D motion-picture measurement system is discussed. Spatial, temporal, and wavelength information capacities are flexibly parceled by utilizing a phase-encoding technique based on multidimension-multiplexed phase-shifting interferometry, which is termed computational coherent superposition.View full abstractDownload PDF (1344K) -
[in Japanese]2021 Volume 49 Issue 6 Pages 325-
Published: 2021
Released on J-STAGE: April 11, 2024
JOURNAL FREE ACCESSTerahertz frequency, i.e., 0.1 ~ 10 THz in frequency corresponds to the intermediate region between electronics and photonics. Recent development of intense terahertz pulse generation technique has opened a new avenue for investigating low-energy electromagnetic responses of condensed matter systems far away from thermal equilibrium. Here we present our recent studies of topological Dirac and Weyl semimetals using intense terahertz pulse and ultrafast time-resolved spectroscopy. A Dirac semimetal Cd3As2 hosts 3-dimensional massless electrons with high mobility, which shows efficient harmonic generation. A Weyl antiferromagnet Mn3Sn shows large anomalous Hall effect comparable to ferromagnets instead of vanishingly-small net magnetization, and therefore attracts growing attention as a candidate material for fast spintronic information processing. Remarkable functionalities of the novel materials at room temperature would contribute to the next-generation high-speed electronics and spintronics in terahertz frequency.View full abstractDownload PDF (628K) -
[in Japanese], [in Japanese]2021 Volume 49 Issue 6 Pages 330-
Published: 2021
Released on J-STAGE: April 11, 2024
JOURNAL FREE ACCESSThe atom-ion hybrid system provides a new platform to study ultracold collisions and chemical reactions. To investigate chemical reactions in ultracold regimes, we combine neutral atoms in an optical trap and ions in a Paul trap to construct an atom-ion hybrid system. Here we introduce our recent work on ultracold elastic/inelastic collisions at a single atom level with a state-by-state manner. From quantitative discussions on the collision’s cross-sections, we clarified the microscopic collisional mechanisms.View full abstractDownload PDF (768K) -
[in Japanese]2021 Volume 49 Issue 6 Pages 334-
Published: 2021
Released on J-STAGE: April 11, 2024
JOURNAL FREE ACCESSFlapping molecule (FLAP) is an emergent class of functional system that shows ultrafast conformational planarization in the singlet excited state, multifold columnar stacking in a condensed phase, and compulsory planarization in stretched polymers. Here, representative applications of FLAP are introduced such as highly sensitive viscosity probe, molecular adhesive with photoinduced melting function, and ratiometric fluorescent force probe.View full abstractDownload PDF (1922K) -
[in Japanese]2021 Volume 49 Issue 6 Pages 339-
Published: 2021
Released on J-STAGE: April 11, 2024
JOURNAL FREE ACCESSMulti-fragment momentum imaging methods in which the momentum images of all kinds of fragment ions can be captured simultaneously, are developed for controlling chemical reactions through ultrafast charge migration processes of polyatomic molecules, including amino acids or bio-relevant molecules. In the momentum imaging method developed in this study, the temporal information of the fragment ions is recovered using time-intensity or time-polarization tagging methods, where the polarization of fluorescence emitted from the phosphor is temporally modulated by an electro-optic light modulator. This realizes one-to-one correspondence between the time-of-flight of fragment ions and the polarization direction of fluorescence. In addition, an ion momentum imaging apparatus with multi-fragment momentum imaging is integrated with a sample injection system of non-volatile molecules through laser-induced acoustic desorption. The operation modes can be easily switched from the velocity map imaging to spatial map imaging to measure the spatial-resolved mass spectrum in a single-shot.View full abstractDownload PDF (566K) -
[in Japanese]2021 Volume 49 Issue 6 Pages 344-
Published: 2021
Released on J-STAGE: April 11, 2024
JOURNAL FREE ACCESSLaser scanning microscopy enables the capturing three-dimensional (3D) structures of biological specimens. In conventional microscopes, iterative acquisitions of two-dimensional images while changing the observation plane are required to construct 3D images, which limits acquisition speed. Recently, we proposed a novel imaging method to acquire 3D images without changing the observation plane. The proposed method is implemented in a light-needle scanning microscope combined with spatially transposed detection using Airy beam conversion for fluorescent signals. The technique allows the rapid acquisition of the 3D images of the fluorescent samples from a single raster scanning of a light needle. Here, we review the imaging technique realized using Bessel and Airy beams—so-called “structured light”—in laser scanning microscopy. In addition, we discuss the future applications using the structured light in biological imaging.View full abstractDownload PDF (1675K) -
[in Japanese], GOLOVIN Daniil O., Yanjun GU2021 Volume 49 Issue 6 Pages 349-
Published: 2021
Released on J-STAGE: April 11, 2024
JOURNAL FREE ACCESSRecently, “Nuclear Photonics” has been established as a new field of science involving Laser Science, Accelerator Physics, Nuclear Physics, Particle Physics, Astro-Physics, and so on. We describe the recent study on the MeV-energy ion acceleration via magnetic reconnection process using high-intensity laser, as a part of our activities on Nuclear Photonics. We also introduce recent studies on Laser-driven Neutron Source, which have the potential to be the third neutron source after nuclear reactors and accelerators.View full abstractDownload PDF (2099K) -
[in Japanese]2021 Volume 49 Issue 6 Pages 354-
Published: 2021
Released on J-STAGE: April 11, 2024
JOURNAL FREE ACCESSLight is a powerful tool to manipulate small objects, but existing approaches often require structured light that limits the manipulated object’s shape, material and size. We have proposed and demonstrated a linear nanomotor based on a plasmonic particle that generates, even when illuminated with a plane wave, lateral optical force due to its directional side scattering. This force direction is determined by the orientation of the nanoparticle rather than a field gradient of the incident light. Therefore, the arrangements of the particles allow controlling the lateral force distributions, which can produce movements, as designed, of microobjects in which they are embedded without shaping and steering the laser beam. In other words, instead of tailoring the light beam, we use the embedded nanoparticles to engineer the optical force experienced by the object. Such linear nanomotor would provide a paradigm shift in optical manipulation as it removes the need for shaping and steering the light beam.View full abstractDownload PDF (1084K) -
[in Japanese]2021 Volume 49 Issue 6 Pages 359-
Published: 2021
Released on J-STAGE: April 11, 2024
JOURNAL FREE ACCESSPhotonic quantum sensing is attracting attention since it outperforms photonic sensing with classical light. Here we present photonic quantum sensing that harnesses the quantum properties of not only light source but also measurement system. First, we introduce nonlinear interferometer as an approach to introduce quantum properties to measurement system, and then show our proposal and the theoretical results of a loss tolerant quantum absorption measurement. We also show photonic quantum sensing, which enables us to detect ultra-faint signal light at a photon counting level under huge noisy environments. We also discuss the future directions and challenges of photonic quantum sensing using the quantum properties of measurement system, including applications to microscopy and spectroscopy.View full abstractDownload PDF (589K)
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