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Institution

Sumitomo Electric Industries

CompanyNew York, New York, United States
About: Sumitomo Electric Industries is a company organization based out in New York, New York, United States. It is known for research contribution in the topics: Optical fiber & Layer (electronics). The organization has 9744 authors who have published 13099 publications receiving 144290 citations. The organization is also known as: Sumitomo Denki Kogyo & Sumitomo Electric Wire & Cable Works.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors demonstrate the importance of the formation of a photonic double-heterostructure, which has resulted in the realization of extremely high-quality factor photonic nanocavities with 600,000, more than one order of magnitude higher than any previous reports.
Abstract: High-quality factor (Q) photonic nanocavities that strongly confine photons in volumes of optical-wavelength dimension are attracting much attention in various fields, including photonics1,2,3,4,5, telecommunications6,7, quantum information8 and cavity quantum electrodynamics9,10, because a strong light–matter interaction is obtained. An important design rule has been proposed11 in an attempt to realize high-Q nanocavities in two-dimensional photonic-crystal slabs. The form of the cavity electric-field distribution should slowly vary, most ideally as described by a gaussian function, in order to suppress out-of-slab photon leakage. However, the exact cavity structure that minimizes photon leakage has not yet been established. Here, we demonstrate the importance of the formation of a photonic double-heterostructure, which has resulted in the realization of nanocavities with extremely high-Q factors of 600,000, more than one order of magnitude higher than any previous reports11,12,13,14. We have also shown theoretically that Q-factors greater than 20,000,000 may be obtained when optimizing the structure.

1,357 citations

Journal ArticleDOI
01 Oct 2000
TL;DR: An adaptive extension of the kinematic controller for the dynamic model of a nonholonomic mobile robot with unknown parameters is proposed, and a torque adaptive controller is derived by using the k cinematic controller.
Abstract: A mobile robot is one of the well-known nonholonomic systems. The integration of a kinematic controller and a torque controller for the dynamic model of a nonholonomic mobile robot has been presented (Fierro and Lewis, 1995). In this paper, an adaptive extension of the controller is proposed. If an adaptive tracking controller for the kinematic model with unknown parameters exists, an adaptive tracking controller for the dynamic model with unknown parameters can be designed by using an adaptive backstepping approach. A design example for a mobile robot with two actuated wheels is provided. In this design, a new kinematic adaptive controller is proposed, then a torque adaptive controller is derived by using the kinematic controller.

771 citations

Journal ArticleDOI
08 Mar 2017-Nature
TL;DR: This work observes long-lived temporal correlations, experimentally identifies the phase boundary and finds that the temporal order is protected by strong interactions, which opens the door to exploring dynamical phases of matter and controlling interacting, disordered many-body systems.
Abstract: Understanding quantum dynamics away from equilibrium is an outstanding challenge in the modern physical sciences Out-of-equilibrium systems can display a rich variety of phenomena, including self-organized synchronization and dynamical phase transitions More recently, advances in the controlled manipulation of isolated many-body systems have enabled detailed studies of non-equilibrium phases in strongly interacting quantum matter; for example, the interplay between periodic driving, disorder and strong interactions has been predicted to result in exotic 'time-crystalline' phases, in which a system exhibits temporal correlations at integer multiples of the fundamental driving period, breaking the discrete time-translational symmetry of the underlying drive Here we report the experimental observation of such discrete time-crystalline order in a driven, disordered ensemble of about one million dipolar spin impurities in diamond at room temperature We observe long-lived temporal correlations, experimentally identify the phase boundary and find that the temporal order is protected by strong interactions This order is remarkably stable to perturbations, even in the presence of slow thermalization Our work opens the door to exploring dynamical phases of matter and controlling interacting, disordered many-body systems

760 citations

Journal ArticleDOI
06 Feb 2003-Nature
TL;DR: Surprisingly, this synthesized polycrystalline diamond is ultrahard and so could be useful in the manufacture of scientific and industrial tools.
Abstract: Polycrystalline diamonds are harder and tougher than single-crystal diamonds and are therefore valuable for cutting and polishing other hard materials, but naturally occurring polycrystalline diamond is unusual and its production is slow. Here we describe the rapid synthesis of pure sintered polycrystalline diamond by direct conversion of graphite under static high pressure and temperature. Surprisingly, this synthesized diamond is ultrahard and so could be useful in the manufacture of scientific and industrial tools.

617 citations

Journal ArticleDOI
TL;DR: In this paper, the InGaN based laser diodes (LDs) on semi-polar free-standing GaN substrates were demonstrated under pulsed operation at room temperature.
Abstract: Lasing in pure green region around 520 nm of InGaN based laser diodes (LDs) on semi-polar {2021} free-standing GaN substrates was demonstrated under pulsed operation at room temperature. The longest lasing wavelength reached to 531 nm and typical threshold current density was 8.2 kA/cm2 for 520 nm LDs. Utilization of a novel {2021} plane enabled a fabrication of homogeneous InGaN quantum wells (QWs) even at high In composition, which is exhibited with narrower spectral widths of spontaneous emission from LDs than those on other planes. The high quality InGaN QWs on the {2021} plane advanced the realization of the green LDs.

410 citations


Authors

Showing all 9744 results

NameH-indexPapersCitations
Jonathan Knight8862537720
Takashi Yamamoto84140135169
Hirohisa Saito7654420448
Yuichi Ikuhara7597424224
Tatsumi Ishihara6770218356
Tim A. Birks6332726243
Gerhard Bringmann6278519866
Hideki Ueno6139414215
Tsunenobu Kimoto5862213668
Hiroyuki Okada5851416296
Hironori Matsumoto5739118768
Soo Jin Chua5677214062
Takashi Yamaguchi5540814261
Koichi Niihara5362116165
Hiroshi Abe523449453
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20222
202191
2020259
2019444
2018371
2017332