ORBi Collection: Physics
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Photochemical generation of reactive oxygen species using plasmonic nanoparticles
http://hdl.handle.net/2268/180850
Title: Photochemical generation of reactive oxygen species using plasmonic nanoparticles
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<br/>Author, co-author: Lismont, Marjorie
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<br/>Abstract: During his lecture entitled “ There is plenty of room at the bottom ”, Richard Feyn- man foresaw the possibility of manipulating material at the scale of individual atoms and molecules. Although Feynman’s conceptual idea of a nanoworld was evoked in 1959, the nanoscience and nanotechnology revolution began 30 years later with the ability to see at the atomic scale with the invention of electronic microscopy and related tools. The size range that has attracted so much attention over these last 30 years is typically from 100 nanometers down to the atomic level. Subsequently, nanomaterials were defined as materials, which have structured components with at least one dimension in this size range. For instance, material with three nanometric dimensions defines a nanoparticle.
Among the variety of core materials available to synthesize nanoparticles, noble metal nanoparticles, i.e. gold and silver, have fascinated people for centuries owing to their bright and intense colors, used in particular as decorative pigments in cathedral stained glasses and artworks. The red and yellow colors displayed by gold and silver nanoparti- cles arise from their interaction with light, which one induces collective oscillations of free electrons at the nanoparticle surface in resonance with the light field. This phenomenon is commonly known as the localized surface plasmon resonance. Their remarkable optical properties and the intense electric field generated by plasmonics nanoparticles have brought these nanomaterials in the forefront of nanotechnology research, ranging from photonics to medicine.
Shining light on plasmonic nanoparticles to push back limitations of light-activated therapy and so taking part to the societal challenge of cancer treatment improvement defines the global framework of the thesis. Falling within the nanomedicine topic, this one more precisely deals with the development of efficient plasmonic nano-drugs using light to cure diseases. Clearly, nanoplasmonics, which explores how electromagnetic field can be confined over dimension on the order or smaller than the wavelength of light, has come a long way since the stained glass of Roman times.Fri, 24 Apr 2015 12:44:39 GMTTransport of Bose-Einstein Condensates through Aharonov-Bohm rings
http://hdl.handle.net/2268/180756
Title: Transport of Bose-Einstein Condensates through Aharonov-Bohm rings
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<br/>Author, co-author: Chrétien, Renaud; Dujardin, Julien; Petitjean, Cyril; Schlagheck, Peter
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<br/>Abstract: We study the one-dimensional (1D) transport properties of an ultracold gas of Bose-Einstein condensed atoms through Aharonov-Bohm (AB) rings. Our system consists of a Bose-Einstein condensate (BEC) that is outcoupled from a magnetic trap into a 1D waveguide which is made of two semi-infinite leads that join a ring geometry exposed to a magnetic flux φ. We specifically investigate the effects of a small atom-atom contact interaction strength on the AB oscillations. The main numerical tools that we use for this purpose are a mean-field Gross-Pitaevskii (GP) description and the truncated Wigner (tW) method. The latter allows for the description of incoherent transport and corresponds to a classical sampling of the evolution of the quantum bosonic many-body state through effective GP trajectories. We find that resonant transmission peaks move with an increasing interaction strength and can be suppressed for sufficiently strong interaction. We also observe that the coherent transmission blockade due to destructive interference at the AB flux φ = π is very robust with respect to the interaction strength.Tue, 21 Apr 2015 14:11:54 GMTPreliminary results for a hydrogen maser cavity in the TE111 mode
http://hdl.handle.net/2268/180731
Title: Preliminary results for a hydrogen maser cavity in the TE111 mode
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<br/>Author, co-author: Van Der Beken, Emeline; Léonard, Daniel; Counet, Arnaud; Bastin, ThierryTue, 21 Apr 2015 10:15:47 GMTInvestigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field
http://hdl.handle.net/2268/180535
Title: Investigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field
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<br/>Author, co-author: Baghdadi, M.; Ruiz, H. S.; Fagnard, Jean-François; Zhang, M.; Wang, W.; Coombs, T. A.
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<br/>Abstract: This paper investigates the practical effectiveness of employing superconducting stacked tapes to superconducting electric machinery. The use of superconducting bulks in various practical applications has been addressed extensively in the literature. However, in practice, dramatic decrease in magnetization would occur on superconducting bulks due to the crossed field effect. In our study, we employed the superconducting stacked tapes in a synchronous superconducting motor, which was designed and fabricated in our laboratory, aiming to lessen demagnetization due to crossed field effect in comparison with superconducting bulks. Applying the transverse AC field, the effects of frequency, amplitude, and number of cycles of the transverse magnetic field are discussed. Furthermore, a stack of 16 layers of superconducting tapes is modelled and the consequences of applying the crossed magnetic field on the sample are evaluated. The confrontation between experiments and simulation allows us to thoroughly understand the crossed field effects on stacked tapes. At the end, a preventive treatment, based on the shielding characteristic of superconductor and materials with high permeability, i.e. $mu$-metal and metalic glass, is suggested. On the other hand, the shielding feature of aforementioned materials will hinder the penetration of magnetic field and, consequently, reduction of the demagnetization will be attained.Wed, 15 Apr 2015 12:36:20 GMTMeasurements on magnetized GdBCO pellets subjected to small transverse ac magnetic fields at very low frequency: Evidence for a slowdown of the magnetization decay
http://hdl.handle.net/2268/180534
Title: Measurements on magnetized GdBCO pellets subjected to small transverse ac magnetic fields at very low frequency: Evidence for a slowdown of the magnetization decay
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<br/>Author, co-author: Fagnard, Jean-François; Kirsch, Sébastien; Morita, Mitsuru; Teshima, Hidekazu; Vanderheyden, Benoît; Vanderbemden, Philippe
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<br/>Abstract: Due to their ability to trap large magnetic inductions, superconducting bulk materials can be used as powerful permanent magnets. The permanent magnetization of such materials, however, can be significantly affected by the application of several cycles of a transverse variable magnetic field. In this work, we study, at T = 77 K, the long term influence of transverse ac magnetic fields of small amplitudes (i.e. much smaller than the full penetration field) on the axial magnetization of a bulk single grain superconducting GdBCO pellet over a wide range of low frequencies (1 mHz–20 Hz). Thermocouples are placed against the pellet surface to probe possible self-heating of the material during the experiments. A high sensitivity cryogenic Hall probe is placed close to the surface to record the local magnetic induction normal to the surface.
The results show first that, for a given number of applied triangular transverse cycles, higher values of dBapp/dt induce smaller magnetization decays. An important feature of practical interest is that, after a very large number of cycles which cause the loss of a substantial amount of magnetization (depending on the amplitude and the frequency of the field), the rate of the magnetization decay goes back to its initial value, corresponding to the relaxation of the superconducting currents due to flux creep only. In the amplitude and frequency range investigated, the thermocouples measurements and a 2D magneto-thermal modelling show no evidence of sufficient self-heating to affect the magnetization so that the effect of the transverse magnetic field cycles on the trapped magnetic moment is only attributed to a redistribution of superconducting currents in the volume of the sample and not to a thermal effect.Wed, 15 Apr 2015 12:03:09 GMTNoncollinear magnetism in post-perovskites from first-principles: Comparison between CaRhO3 and NaNiF3
http://hdl.handle.net/2268/180445
Title: Noncollinear magnetism in post-perovskites from first-principles: Comparison between CaRhO3 and NaNiF3
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<br/>Author, co-author: Garcia Castro, Andrés Camilo; Romero, Aldo; Bousquet, Eric
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<br/>Abstract: Based on first-principles calculations, we study the noncollinear magnetism in the post-perovskites (pPv) phase of NaNiFinline image and CaRhOinline image crystals. We find that the magnetic canting is one of the most promising properties of pPv systems, which is allowed by symmetry in all the pPv crystals inline image with a magnetically active B-site. In the pPv phase of NaNiFinline image, which has a inline image antiferromagnetic ground state with a inline image ferromagnetic canting, we obtain a magnetic canting amplitude of about 0.1 inline imageatominline image, which is much larger than in the one obtained in CaRhOinline image (canting amplitude of 0.04 inline image). We also computed the exchange constants (inline image), the single-ion anisotropy (SIA) parameters and the anti-symmetric magnetic coupling described by the Dzyaloshinsky–Moriya (DM) interaction in order to scrutinize the origin of the magnetic canting. We find that the canting in NaNiFinline image is mainly due to the DM interaction, while in CaRhOinline image, both DM and SIA contribute to the magnetic canting. Our calculations thus confirm the noncollinear magnetic ground-state solution experimentally observed in both compounds and the calculated magnetic exchange interactions also confirm the quasi-2D magnetic behavior reported in pPv.Mon, 13 Apr 2015 14:55:13 GMTSingle-Molecule Sensing Using Carbon Nanotubes Decorated with Magnetic Clusters
http://hdl.handle.net/2268/180103
Title: Single-Molecule Sensing Using Carbon Nanotubes Decorated with Magnetic Clusters
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<br/>Author, co-author: Zanolli, Zeila; Charlier, Jean-Christophe
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<br/>Abstract: First-principles and nonequilibrium Green's function techniques are used to investigate magnetism and spin-polarized quantum transport in metallic carbon nanotubes (CNT) decorated with transition metal (Ni_13, Pt_13) magnetic nanoclusters (NC). For small cluster sizes, the strong CNT-NC interaction induces spin-polarization in the CNT. The adsorption of a benzene molecule is found to drastically modify the CNT-NC magnetization. Such a magnetization change should be large enough to be detected via magnetic-AFM or SQUID magnetometry, hence suggesting a novel approach for single-molecule gas detection.Thu, 09 Apr 2015 13:30:54 GMTSimulation of the elementary evolution operator with the motional states of an ion in an anharmonic trap
http://hdl.handle.net/2268/180084
Title: Simulation of the elementary evolution operator with the motional states of an ion in an anharmonic trap
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<br/>Author, co-author: Santos, Ludovic; Justum, Yves; Vaeck, Nathalie; Desouter, Michèle
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<br/>Abstract: Following a recent proposal of L. Wang and D. Babikov, J. Chem. Phys. 137, 064301 (2012), we theoretically illustrate the possibility of using the motional states of a Cd+ ion trapped in a slightly anharmonic potential to simulate the single-particle time-dependent Schrödinger equation. The simulated wave packet is discretized on a spatial grid and the grid points are mapped on the ion motional states which define the qubit network. The localization probability at each grid point is obtained from the population in the corresponding motional state. The quantum gate is the elementary evolution operator corresponding to the time-dependent Schrödinger equation of the simulated system. The corresponding matrix can be estimated by any numerical algorithm. The radio-frequency field able to drive this unitary transformation among the qubit states of the ion is obtained by multi-target optimal control theory. The ion is assumed to be cooled in the ground motional state and the preliminary step consists in initializing the qubits with the amplitudes of the initial simulated wave packet. The time evolution of the localization probability at the grids points is then obtained by successive applications of the gate and reading out the motional state population. The gate field is always identical for a given simulated potential, only the field preparing the initial wave packet has to be optimized for different simulations. We check the stability of the simulation against decoherence due to fluctuating electric fields in the trap electrodes by applying dissipative Lindblad dynamics.Wed, 08 Apr 2015 13:36:13 GMTResonant and antiresonant bouncing droplets
http://hdl.handle.net/2268/179931
Title: Resonant and antiresonant bouncing droplets
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<br/>Author, co-author: Hubert, Maxime; Robert, Damien; Caps, Hervé; Dorbolo, Stéphane; Vandewalle, Nicolas
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<br/>Abstract: When placed onto a vibrating liquid bath, a droplet may adopt a permanent bouncing behavior, depending on both the forcing frequency and the forcing amplitude. The relationship between the droplet deformations and the bouncing mechanism is studied experimentally and theoretically through an asymmetric and dissipative bouncing spring model. Antiresonance phenomena are evidenced. Experiments and theoretical predictions show that both resonance at specific frequencies and antiresonance at Rayleigh frequencies play crucial roles in the bouncing mechanism. In particular, we show that they could be exploited for bouncing droplet size selection.Fri, 03 Apr 2015 04:30:13 GMTSystematic classification of two-loop realizations of the Weinberg operator
http://hdl.handle.net/2268/179764
Title: Systematic classification of two-loop realizations of the Weinberg operator
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<br/>Author, co-author: Aristizabal Sierra, Diego; Hirsch, Martin; Degée, Audrey; Dorame, Luis
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<br/>Abstract: We systematically analyze the d=5 Weinberg operator at 2-loop order. Using a diagrammatic approach, we identify two different interesting categories of neutrino mass models: (i) Genuine 2- loop models for which both, tree-level and 1-loop contributions, are guaranteed to be absent. And (ii) finite 2-loop diagrams, which correspond to the 1-loop generation of some particular vertex appearing in a given 1-loop neutrino mass model, thus being effectively 2-loop. From the large list of all possible 2-loop diagrams, the vast majority are infinite corrections to lower order neutrino mass models and only a moderately small number of diagrams fall into these two interesting classes. Moreover, all diagrams in class (i) are just variations of three basic diagrams, with examples discussed in the literature before. Similarly, we also show that class (ii) diagrams consists of only variations of these three plus two more basic diagrams. Finally, we show how our results can be consistently and readily used in order to construct two-loop neutrino mass models.Sat, 28 Mar 2015 14:18:59 GMTFerromagnetism induced by entangled charge and orbital orderings in ferroelectric titanate perovskites
http://hdl.handle.net/2268/179636
Title: Ferromagnetism induced by entangled charge and orbital orderings in ferroelectric titanate perovskites
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<br/>Author, co-author: Bristowe, Nicholas; Varignon, Julien; Fontaine, Denis; Bousquet, Eric; Ghosez, Philippe
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<br/>Abstract: In magnetic materials, the Pauli exclusion principle typically drives anti-alignment between electron spins on neighbouring species resulting in antiferromagnetic behaviour. Ferromagnetism exhibiting spontaneous spin alignment is a fairly rare behaviour, but once materialized is often associated with itinerant electrons in metals. Here we predict and rationalize robust ferromagnetism in an insulating oxide perovskite structure based on the popular titanate series. In half-doped layered titanates, the combination of Jahn–Teller and oxygen breathing motions opens a band gap and creates an unusual charge and orbital ordering of the Ti d electrons. It is argued that this intriguingly intricate electronic network favours the elusive inter-site ferromagnetic (FM) ordering, on the basis of intra-site Hund's rules. Finally, we find that the layered oxides are also ferroelectric with a spontaneous polarization approaching that of BaTiO3. The concepts are general and design principles of the technologically desirable FM ferroelectric multiferroics are presented.Thu, 26 Mar 2015 10:56:55 GMTQualité diagnostique et efficacité d'un système en ligne entrainant à la résolution de problèmes complexes en physique
http://hdl.handle.net/2268/179504
Title: Qualité diagnostique et efficacité d'un système en ligne entrainant à la résolution de problèmes complexes en physique
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<br/>Author, co-author: Marique, Pierre-Xavier; Jacquet, Maud; Georges, François; Hoebeke, Maryse; Poumay, Marianne
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<br/>Abstract: Dans le cadre de projets de lutte contre l’échec en bachelier, le LabSET et des enseignants de physique de l'Université de Liège ont développé un dispositif en ligne d’entraînement à la résolution de problèmes complexes en physique. La recherche porte d’une part sur le diagnostic de la maîtrise des processus cognitifs à mobiliser pour résoudre des problèmes de physique et d’autre part sur le lien entre l’entrainement effectif en ligne et la performance des étudiants lors de la résolution de problèmes à l'examen. Les analyses reposent sur étude menée auprès de 876 étudiants inscrits en premier bachelier médecine. Elles ont été effectuées sur bases des données subjectives (auto-évaluation du processus et du produit) et objectives (nombre de connexions aux exercices en ligne, résultats de maîtrise des questions spécifiques aux processus cognitifs étudiés, taux de réussite et notes aux examens). A l’issue de la recherche, nous constatons que c’est le processus d’analyse. Près de 50 % des étudiants en sont conscients. Bien que la force d'association soit de faible à moyenne, une dépendance est observée entre travail en ligne et réussite aux problèmes présentés à l’examen de juin. Les notes des étudiants ayant travaillé en ligne sont supérieures à celles des étudiants n’ayant réalisé aucun problème en ligne. Cependant, étant donné que les étudiants ayant réussi la physique sont aussi ceux ayant réussi des autres matières scientifiques, il est difficile d'établir un rapport de causalité entre travail en ligne et performances.Mon, 23 Mar 2015 05:30:46 GMTNovel magneto-electric multiferroics from first-principles calculations
http://hdl.handle.net/2268/179464
Title: Novel magneto-electric multiferroics from first-principles calculations
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<br/>Author, co-author: Varignon, Julien; Bristowe, Nicholas; Bousquet, Eric; Ghosez, Philippe
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<br/>Abstract: Interest in first-principles calculations within the multiferroic community has been rapidly on the rise over the last decade. Initially considered as a powerful support to explain experimentally observed behaviours, the trend has evolved and, nowadays, density functional theory calculations have become also an essential predicting tool for identifying original rules to achieve multiferroism and design new magneto-electric compounds. This chapter aims at highlighting the key advances in the field of multiferroics, to which first-principles methods have contributed significantly. The essential theoretical developments that made this research possible are also briefly presented.Thu, 19 Mar 2015 10:51:04 GMTDeformations of an elastic pipe submitted to gravity and internal fluid flow
http://hdl.handle.net/2268/179455
Title: Deformations of an elastic pipe submitted to gravity and internal fluid flow
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<br/>Author, co-author: Darbois-Texier, Baptiste; Dorbolo, Stéphane
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<br/>Abstract: This article describes the deformation of an elastic pipe submitted to gravity and to an internal fluid flow. The pipe is clamped horizontally at one end and free at the other end. As the fluid velocity increases, the shape changes from an elastic beam deflected by its own weight towards an horizontal posi- tion. The shape of the pipe is characterized experimentally and is compared with a theoretical model based on the Euler-Bernoulli approximation and the conservation of the fluid momentum. We study how the determination of the pipe deformation provides an estimation of the conveyed fluid flow. Finally, the vertical force produced by the conveyed fluid to lift off a mass is deduced.Thu, 19 Mar 2015 05:40:44 GMTMicrowave-stimulated superconductivity due to presence of vortices
http://hdl.handle.net/2268/179359
Title: Microwave-stimulated superconductivity due to presence of vortices
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<br/>Author, co-author: Lara, Antonio; Aliev, Farkhad; Silhanek, Alejandro; Moshchalkov, Victor
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<br/>Abstract: The response of superconducting devices to electromagnetic radiation is a core concept implemented in diverse applications, ranging from the currently used voltage standard to single photon detectors in astronomy. Suprisingly, a sufficiently high power subgap radiation may stimulate superconductivity itself. The possibility of stimulating type II superconductors, in which the radiation may interact also with vortex cores, remains however unclear. Here we report on superconductivity enhanced by GHz radiation in type II superconducting Pb films in the presence of vortices. The stimulation effect is more clearly observed in the upper critical field and less pronounced in the critical temperature. The magnetic field dependence of the
vortex related microwave losses in a film with periodic pinning reveals a reduced dissipation of mobile vortices in the stimulated regime due to a reduction of the core size. Results of numerical simulations support the validy of this conclusion. Our findings may have intriguing connections with holographic superconductors in which the possibility of stimulation is under current debate.Tue, 17 Mar 2015 12:49:26 GMTElastic and inelastic transmission in guided atom lasers: A truncated Wigner approach
http://hdl.handle.net/2268/179216
Title: Elastic and inelastic transmission in guided atom lasers: A truncated Wigner approach
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<br/>Author, co-author: Dujardin, Julien; Argüelles, Arturo; Schlagheck, Peter
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<br/>Abstract: We study the transport properties of a Bose-Einstein condensate formed by an ultracold gas of bosonic atoms that is coupled from a magnetic trap into a one-dimensional waveguide. Our theoretical approach to tackling this problem is based on the truncated Wigner method for which we assume the system to consist of two semi-infinite noninteracting leads and a finite interacting scattering region with two constrictions modeling an atomic quantum dot. The transmission is computed in the steady-state regime and we find a good agreement between truncated Wigner and matrix-product state calculations. We also identify clear signatures of inelastic resonant scattering by analyzing the distribution of energy in the transmitted atomic-matter wave beam.Thu, 12 Mar 2015 13:09:23 GMTProceedings of the 2nd Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology (FLASY12)
http://hdl.handle.net/2268/179135
Title: Proceedings of the 2nd Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology (FLASY12)
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<br/>Author, co-author: de Medeiros Varzielas, I.; Hambrock, C.; Hiller, G.; Jung, M.; Leser, P.; Päs, H.; Schacht, S.; Aoki, M.; Barry, J.; Bhattacharyya, G.; Blankenburg, G.; Buras, A. J.; Calibbi, L.; Covi, L.; Das, D.; Deppisch, F. F.; Descotes-Genon, S.; Ding, G.-J.; Duerr, M.; Feldmann, T.; Freytsis, M.; Girrbach, J.; González Canales, F.; Hartmann, F.; Heeck, J.; Helo, J. C.; Hirsch, M.; Ho, C. M.; Holthausen, M.; Kadosh, A.; Kamenik, J. F.; Kilian, W.; King, S. F.; Ko, P.; Kovalenko, S.; Krauss, M. B.; Kreps, M.; Kubo, J.; Ligeti, Z.; Ludl, P. O.; Ma, E.; Matias, J.; Merle, A.; Meroni, A.; Mondragón, A.; Mondragón, M.; Morisi, S.; Nandi, S.; Omura, Y.; Peinado, E.; Sala, F.; Saldaña Salazar, U.; Schmidt, D.; Schnitter, K.; Serôdio, H.; Simões, C.; Spinrath, M.; Takano, H.; Tanimoto, M.; Tórtola, M.; Turczyk, S.; Vicente, Avelino; Virto, J.; Wang, Y.-M.; Weiler, T.; Yamamoto, K.; Yang, M. J. S.; Yu, C.; Zwicky, R.
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<br/>Abstract: These are the proceedings of the 2nd Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology, held 30 June 2012 - 4 July 2012, Dortmund, Germany.Wed, 11 Mar 2015 07:54:14 GMTTwo-Photon Luminescence of Gold Nanorods Mediated by Higher Order Plasmon Modes
http://hdl.handle.net/2268/178912
Title: Two-Photon Luminescence of Gold Nanorods Mediated by Higher Order Plasmon Modes
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<br/>Author, co-author: Verellen, Niels; Denkova, Denitza; De Clercq, Ben; Silhanek, Alejandro; Ameloot, Marcel; Van Dorpe, Pol; Moshchalkov, Victor
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<br/>Abstract: Metallic nanorod antennas can be considered as an analogue to classical half-wave dipole antennas, constituting an important tool for manipulating linear and nonlinear lightmatter interactions in nanoscale volumes. Using two-photon luminescence (TPL) scanning laser microscopy, we investigate such optical antennas beyond their fundamental dipole mode.
The antenna mode dispersion is extracted from the nonlinear TPL measurement and reveals a TPL process that is dominated by plasmon-induced enhancement of the two photon absorption in the metal. Additionally, a clear signature of the mode parity is observed in the TPL images. TPL maxima are observed outside the antenna boundaries for even parity modes, whereas they are located inside for odd modes. It is concluded that for even modes the two-photon
luminescence emission is strongly mediated by retardation of the excitation field, a consequence of their zero net-dipole moment. This selective excitation of different mode parities is highly relevant for nanoscale enhanced nonlinear optics, as well as plasmonic nanosensor applications and tuning of radiative properties of quantum emitters.Wed, 04 Mar 2015 17:05:34 GMTReverse current transient behavior of pGeSn/nGe diodes
http://hdl.handle.net/2268/178857
Title: Reverse current transient behavior of pGeSn/nGe diodes
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<br/>Author, co-author: Baert, Bruno; Gupta, Somya; Gencarelli, Federica; Shimura, Yosuke; Loo, Roger; Simoen, Eddy; Nguyen, Ngoc DuyTue, 03 Mar 2015 11:47:22 GMTElectrical characterization of p-GeSn/n-Ge diodes with interface traps under dc and ac regimes
http://hdl.handle.net/2268/178856
Title: Electrical characterization of p-GeSn/n-Ge diodes with interface traps under dc and ac regimes
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<br/>Author, co-author: Baert, Bruno; Gupta, Somya; Gencarelli, Federica; Loo, Roger; Simoen, EddyTue, 03 Mar 2015 11:41:58 GMT