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Volume 45, Issue 3
Special Issue on Optical Complex Systems toward Industrial Applications
Displaying 1-10 of 10 articles from this issue
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Special Issue on Optical Complex Systems toward Industrial Applications
Special Issue
Laser Review
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Fumiyoshi KUWASHIMA2017 Volume 45 Issue 3 Pages 137-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSDownload PDF (234K) -
Motoichi OHTSU, Makoto KATORI2017 Volume 45 Issue 3 Pages 139-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSBy noting that a dressed photon is a complex quasi-particle composed of photons, electrons, and phonons, creation of the dressed photon and its characteristics are reviewed from the viewpoint of the quantum field in an off-shell space. After applications to silicon light emitting diodes and lasers are presented, their fabrication and operating principle are analyzed by the stochastic model of a complex system.View full abstractDownload PDF (470K) -
Masashi AONO2017 Volume 45 Issue 3 Pages 144-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSA single-celled amoeba (a plasmodial slime mold), which exhibits complex spatiotemporal oscillatory dynamics, has shown to be used to search for a solution to a combinatorial optimization problem. Photoexcitation transfer phenomena in a certain quantum-dot network mediated by optical near-field interactions generate stochastic spatiotemporal dynamics. Here we review a novel computing architecture that exploits the spatiotemporal dynamics in the quantum-dot network to solve the satisfiability problem, which is an NP-complete problem.View full abstractDownload PDF (624K) -
Kazutaka KANNO, Miwa TEZUKA, Joma NAKAYAMA, Atsushi UCHIDA, Masato ...2017 Volume 45 Issue 3 Pages 148-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSWe overview the techniques for improving the performance of reservoir computing (RC) using complex laser dynamics and introduce two schemes: a mutual coupling system and a chaos mask system. We use two mutually coupled optoelectronic oscillators as a reservoir in the RC based on the mutual coupling system. We also introduce a chaos mask signal for preprocessing input signals in the RC based on a semiconductor laser with optical feedback and injection. The RC performance is evaluated by a chaotic time-series prediction task. We numerically show that these two schemes improve the performance of the time-series prediction task.View full abstractDownload PDF (601K) -
Kosaku KATO, Keisuke TAKANO, Yuzuru TADOKORO, Thanh Nhat Khoa PHAN ...2017 Volume 45 Issue 3 Pages 153-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSIn this review, we introduce our recent study on terahertz pulse generation from silver nanoparticle ink. On the ink's surface, complex nanostructures are spontaneously formed by a baking process. Such metallic nanostructures, which enhance electric fields by plasmon resonance, increase the emission of terahertz waves. The structures formed on the ink surface depend on the baking temperatures, and the generation efficiency of the terahertz waves was large for samples baked around the transition temperatures of the ink from the insulator to the metal. We discuss the relation among the baking temperature, the nanostructures, and the emitted terahertz waves, based on the percolation process of the nanoparticles dispersed in the ink. We also describe the fabrication of terahertz sources that effectively emit a specific frequency by combining spontaneously formed nanostructures with microstructures made using inkjet printers or laser ablation processes.View full abstractDownload PDF (554K) -
Kazuyoshi KURIHARA, Fumiyoshi KUWASHIMA, Osamu MORIKAWA, Kohji YAM ...2017 Volume 45 Issue 3 Pages 158-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSWe explain the concept of THz plasmonics as an extension of conventional plasmonics in the optical region. The analytical theory of THz plasmonic superfocusing modes in metallic V-groove tapered waveguides is described in detail based on the quasi-separation of variables with perturbation methods. Applications of THz plasmonic superfocusing show that the concept of THz plasmonics is very useful in experiments.View full abstractDownload PDF (1367K) -
Norikazu FUSE2017 Volume 45 Issue 3 Pages 165-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSThe applicability of terahertz waves to the detection of rust under coatings is discussed, focusing on the electromagnetic waves generated from chaotic multimode semiconductor laser oscillations. The corrosion states of steel used for the cross-arms of electric transmission lines are provided as maps with a special resolution down to the sub-mm level to reveal transfusion of rust fluid. These analyses are made possible by the chemical structure of rust, which shows an absorption band tail in the terahertz frequency region. Terahertz waves generated by the optical excitation of photoconductive antennas using a chaotic laser show that the absorption band tail extends to around 180 GHz. Chaotic laser systems using small and inexpensive semiconductor lasers are potentially promising tools for detecting underfilm corrosion.View full abstractDownload PDF (989K)
Laser Original
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Amaka TANAKA, Satoru MATSUKURA, Ryoichi MIZUTANI, Atsuki ISHIGURO, ...2017 Volume 45 Issue 3 Pages 170-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSWe propose a simple method for measuring the birefringence of a polarization maintaining fiber (PMF). Our method is based on measurements of the spontaneous emission noise intensity variation in a gainswitched distributed feedback semiconductor laser with delayed optical feedback. The optical lengths of the PMF along both the fast and slow axes were measured separately with a resolution of 20 μm. From the measured optical lengths, the ratio of the birefringence to the refractive index of the fast axis was estimated to be (2.217 ± 0.012) × 10‒4. We checked the validity of the estimated value by comparing it with the measured value of (2.2452 ± 0.0002) × 10‒4 in a conventional method using a Sagnac interferometer.View full abstractDownload PDF (731K)
Regular Paper
Laser Original
Technical Note
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Yusuke SHINYA, Tadayuki IMAI, Seiji TOYODA, Junya KOBAYASHI, Tadas ...2017 Volume 45 Issue 3 Pages 175-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSWe developed a high-speed Time-Domain en face OCT with a KTa1‒xNbxO3 (KTN) optical beam deflector. A KTN optical beam deflector illuminates large area with fast scanning. In our imaging system, fast scanning was performed at 200 kHz by the KTN optical beam deflector, while slow scanning at 800 Hz was simultaneously performed by the galvanometer. In a preliminary experiment, we obtained en face OCT images of a human fingerprint at 800 fps, which is the fastest speed obtained by a TD-OCT. Furthermore, a 3D-OCT image was also obtained at 0.2 s by our imaging system.View full abstractDownload PDF (1568K) -
Mizuki TSUBOI, Kohei TAKEDA, Tomoharu NAKAZATO, Masahiro KONO, Koh ...2017 Volume 45 Issue 3 Pages 181-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSThe development of scintillator materials for scattered neutrons is essential in studying laser fusion experiments. We have previously investigated and proposed Pr3+-doped 20Al(PO3)3-80LiF (APLF + Pr) glasses as scintillators for neutron detection. The APLF + Pr glass emissions are then investigated with synchrotron radiation excitation and varying sample temperature. APLF + Pr glasses exhibit luminescence emissions located at 200 to 300 nm and 400 nm attributed to the 4f5d→4f2 and 4f2→4f2 (1S0→3Pj + 1I6) transitions, respectively. In addition, the 200 to 300-nm emission is not substantially affected by temperature, while the 400-nm emission intensities increase with decreasing sample temperature. This temperature dependence is attributed to cross relaxation whose effect can be controlled by the Pr-doping concentration. Our results suggest that doping concentration of APLF + Pr must be optimized and that APLF + Pr glasses must operate at low temperatures for better neutron detection.View full abstractDownload PDF (398K)
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