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SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics (IMOC)

作者： Roberto Yuji Tanaka Angelo Passaro Nancy Mieko Abe Lucas Kriesel Sperotto Diogo de Moura Pedroso Gustavo Soares Vieira Space Science and Technology Graduate Program Instituto Tecnológico de Aeronáutica – ITA São José dos Campos Brazil Applied Physics Division Instituto de Estudos Avançados – IEAv São José dos Campos Brazil Applied Physics Division Instituto de Estudos Avançados Sao Jose dos Campos Brazil Applied Physics Division Instituto de Estudos Avançados - IEAv São José dos Campos Brazil

ISBN: (纸本)9781479913961

This work presents the recent improvements in a computer program created to assist the design and analysis of quantum well, wire, and dot nanostructured semiconductor-based devices. The list of added features includes the calculation of heavy hole, light hole and split-off energy bands, dark current, photocurrent, and absorption spectrum. Additionally, the computer program allows self-consistent computation and can take into account the energy band non-parabolic effects in the effective mass approximation.

关键词： Convergence

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All-optical tunable comb filters using ytterbium doped fibers and an LPG pair

All-optical tunable comb filters using ytterbium doped fiber...

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2013 18th OptoElectronics and Communications Conference Held Jointly with 2013 International Conference on Photonics in Switching, OECC/PS 2013

作者： Kim, Yune Hyoun Kim, Bok Hyeon Hann, Swook Im, Young-Eun Lim, Jung Woon Kim, Jong-Sup Kim, Jeong Ho Lim, Ju Young Han, Won-Taek Laser-IT Research Center KOPTI 971-35 Wolchul-dong Buk-gu Gwangju 500-430 Korea Republic of Advanced Photonics Research Institute GIST 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of Graduate Program of Photonics and Applied Physics School of Information and Communications GIST 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of

ISBN: (纸本)9784885522710

We have demonstrated a new type all-optical tunable comb filter by using a long-period fiber gratings(LPG) pair spliced with an ytterbium doped fiber. When the 25.5cm long ytterbium doped fiber was used with the ytterbium doping concentration of ∼0.82at%, the wavelength channel spacing and the isolation between channels were 0.7nm and 16-21dB, respectively, between 1545nm and 1555nm. Also, the optical comb filter was tuned up to '1.53π' phase shift at the launched pump power of 56mW with the LD at 976nm. © 2013 IEICE.

关键词： Comb filters

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Electrodes: Lithium Intercalation Behavior in Multilayer Silicon Electrodes (Adv. Energy Mater. 7/2014)

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Advanced Energy Materials 2014年第7期4卷

作者： Tim T. Fister Jennifer Esbenshade Xiao Chen Brandon R. Long Bing Shi Christian M. Schlepütz Andrew A. Gewirth Michael J. Bedzyk Paul Fenter Chemical Sciences and Engineering Division Argonne National Laboratory Argonne IL 60439 USA Department of Chemistry University of Illinois Urbana‐Champaign Urbana IL 61801 USA Graduate Program in Applied Physics Northwestern University Evanston IL USA Advanced Photon Source Argonne National Laboratory Argonne IL 60439 USA Departments of Materials Science & Engineering and Physics & Astronomy Northwestern University Evanston IL 60208 USA

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Coherent control of plasmonic spectra using the orbital angular momentum of light

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Physical Review B 2013年第20期88卷 205132-205132页

作者： Aaron S. Rury []Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Dr. Pasadena California 91109 and Applied Physics Program University of Michigan 450 Church St. Ann Arbor Michigan 48109 [*]arury@caltech.edu

This study proposes a method to control the frequency-dependent scattering spectra from plasmonic spheres via the conservation of incident orbital angular momentum (OAM) in classical light scattering. By providing controllable distributions of OAM content, fractional vortex beams allow selective tailoring of Fano features present in coherent scattering processes. The applicability of this control methodology is briefly discussed in the context of plasmonic crystals that recent studies have shown possess modes described by a well-defined OAM content.

关键词： ANGULAR momentum (Nuclear physics) PLASMONS (physics) ATOMIC orbitals SPECTRUM analysis NUCLEAR physics

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Torque Spectroscopy of DNA: Base-Pair Stability, Boundary Effects, Backbending, and Breathing Dynamics

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Physical Review Letters 2013年第17期110卷 178103-178103页

作者： Florian C. Oberstrass Louis E. Fernandes Paul Lebel Zev Bryant Department of Bioengineering Stanford University Stanford California 94305 USA Program in Biophysics Stanford University Stanford California 94305 USA Department of Applied Physics Stanford University Stanford California 94305 USA Department of Structural Biology Stanford University Medical Center Stanford California 94305 USA

Changes in global DNA linking number can be accommodated by localized changes in helical structure. We have used single-molecule torque measurements to investigate sequence-specific strand separation and Z-DNA formation. By controlling the boundary conditions at the edges of sequences of interest, we have confirmed theoretical predictions of distinctive boundary-dependent backbending patterns in torque-twist relationships. Abrupt torque jumps are associated with the formation and collapse of DNA bubbles, permitting direct observations of DNA breathing dynamics.

关键词： DNA RESEARCH HELICAL structure (Molecules) SINGLE molecules TORQUE measurements BACKBENDING (Nuclear physics)

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All-optical tunable comb filters using ytterbium doped fibers and an LPG pair

All-optical tunable comb filters using ytterbium doped fiber...

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International Conference on Photonics in Switching (PS)

作者： Yune Hyoun Kim Bok Hyeon Kim Swook Hann Young-Eun Im Jung Woon Lim Jong-Sup Kim Jeong Ho Kim Ju Young Lim Won-Taek Han Laser-IT Research Center KOPTI Gwangju South Korea Advanced Photonics Research Institute GIST Gwangju South Korea Graduate Program of Photonics and Applied Physics School of Information and Communications GIST Gwangju South Korea

ISBN: (纸本)9784885522710

We have demonstrated a new type all-optical tunable comb filter by using a long-period fiber gratings(LPG) pair spliced with an ytterbium doped fiber. When the 25.5cm long ytterbium doped fiber was used with the ytterbium doping concentration of ~0.82at%, the wavelength channel spacing and the isolation between channels were 0.7nm and 16-21dB, respectively, between 1545nm and 1555nm. Also, the optical comb filter was tuned up to `1.53π' phase shift at the launched pump power of 56mW with the LD at 976nm.

关键词： Optical fiber polarization Optical fiber communication Optical fiber devices Optical fiber filters Ytterbium Optical pumping

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Relations Between System Matrices and the Complete Data Space in MLEM Using the Kullback-Leibler Distance

Relations Between System Matrices and the Complete Data Spac...

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IEEE Nuclear Science Symposium

作者： Sam S. Huh Neal H. Clinthorne Andrew Haefner Daniel Chivers Lucian Mihailescu Kai Vetter Applied Nuclear Physics Program Lawrence Berkeley National Laboratory Berkeley CA USA Department of Radiology University of Michigan Ann Arbor MI USA Department of Nuclear Engineering University of California Berkeley CA USA

We present a quantitative method for relating system matrices to the complete-data space in maximum likelihood expectation maximization (MLEM) using the Kullback-Leibler distance. We show that a more accurate system matrix has a smaller Kullback-Leibler (KL) distance. System matrices of a coded aperture imaging system were used for comparison. The calculation of the KL distance is based on the Monte Carlo integral. We note that system matrices for the KL distance evaluation should be generated by underlying physics processes.

关键词： Detectors Monte Carlo methods Ray tracing Attenuation Position measurement Imaging Apertures

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Localized Excited Charge Carriers Generate Ultrafast Inhomogeneous Strain in the Multiferroic BiFeO3

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Physical Review Letters 2014年第9期112卷 097602-097602页

作者： Daniel Schick Marc Herzog Haidan Wen Pice Chen Carolina Adamo Peter Gaal Darrell G. Schlom Paul G. Evans Yuelin Li Matias Bargheer Institut für Physik und Astronomie Universität Potsdam Karl-Liebknecht-Straße 24-25 14476 Potsdam Germany Abteilung Physikalische Chemie Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6 14195 Berlin Germany X-Ray Science Division Argonne National Laboratory Argonne Illinois 60439 USA Department of Materials Science and Engineering and Materials Science Program University of Wisconsin-Madison Madison Wisconsin 53706 USA Department of Material Science and Engineering Cornell University Ithaca New York 14853 USA Department of Applied Physics Stanford University Stanford California 94305-4045 USA Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Wilhelm-Conrad-Röntgen Campus BESSY II Albert-Einstein-Straße 15 12489 Berlin Germany Kavli Institute at Cornell for Nanoscale Science Ithaca New York 14853 USA

We apply ultrafast x-ray diffraction with femtosecond temporal resolution to monitor the lattice dynamics in a thin film of multiferroic BiFeO3 after above-band-gap photoexcitation. The sound-velocity limited evolution of the observed lattice strains indicates a quasi-instantaneous photoinduced stress which decays on a nanosecond time scale. This stress exhibits an inhomogeneous spatial profile evidenced by the broadening of the Bragg peak. These new data require substantial modification of existing models of photogenerated stresses in BiFeO3: the relevant excited charge carriers must remain localized to be consistent with the data.

关键词： LATTICE dynamics MULTIFERROIC materials FERROELECTRICITY FEMTOSECOND lasers MAGNETISM PLASMA X-ray sources X-ray diffraction

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Enhancement of photonic density of states in finite graphene multilayers

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Physical Review B 2013年第19期88卷 195411-195411页

作者： Ashley M. DaSilva You-Chia Chang Ted Norris Allan H. MacDonald Department of Physics The University of Texas at Austin Austin Texas 78712-1192 USA Applied Physics Program The University of Michigan Ann Arbor Michigan 48109 USA Center for Ultrafast Optical Science The University of Michigan Ann Arbor Michigan 48109 USA Department of Electrical Engineering and Computer Science The University of Michigan Ann Arbor Michigan 48109 USA

We consider the optical properties of finite systems composed of a series of graphene sheets separated by thin dielectric layers. Because these systems respond as conductors to electric fields in the plane of the graphene sheets and as insulators to perpendicular electric fields, they can be expected to have properties similar to those of hyperbolic metamaterials. We show that under typical experimental conditions graphene/dielectric multilayers have enhanced Purcell factors, and enhanced photonic densities of states in both the terahertz (THz) and midinfrared (mid-IR) frequency range. These behaviors can be traced to the coupled plasmon modes of the multilayer graphene system. We show that these results can be obtained with just a few layers of graphene.

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Light‐Directing Omnidirectional Circularly Polarized Reflection from Liquid‐Crystal Droplets†

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Angewandte Chemie 2014年第7期127卷

作者： Jing Fan Yannian Li Hari Krishna Bisoyi Rafael S. Zola Deng‐ke Yang Timothy J. Bunning David A. Weitz Quan Li School of Engineering and Applied Sciences Harvard University Cambridge MA 02138 (USA) Liquid Crystal Institute and Chemical Physics Interdisciplinary Program Kent State University Kent OH 44242 (USA) Departamento de Física Universidade Tecnológica Federal do Paraná‐Apucarana PR 86812‐460 (Brazil) Materials and Manufacturing Directorate Air Force Research Laboratory WPAFB Dayton OH 45433 (USA) Department of Physics Harvard University Cambridge MA 02138 (USA)

Constructing and tuning self‐organized three‐dimensional (3D) superstructures with tailored functionality is crucial in the nanofabrication of smart molecular devices. Herein we fabricate a self‐organized, phototunable 3D photonic superstructure from monodisperse droplets of one‐dimensional cholesteric liquid crystal (CLC) containing a photosensitive chiral molecular switch with high helical twisting power. The droplets are obtained by a glass capillary microfluidic technique by dispersing into PVA solution that facilitates planar anchoring of the liquid‐crystal molecules at the droplet surface, as confirmed by the observation of normal incidence selective circular polarized reflection in all directions from the core of individual droplet. Photoirradiation of the droplets furnishes dynamic reflection colors without thermal relaxation, whose wavelength can be tuned reversibly by variation of the irradiation time. The results provided clear evidence on the phototunable reflection in all directions.

关键词： Farbe Flüssigkristalltröpfchen Mikrofluidik Photonische Kristalle Selektive Reflexion

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