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25 Jan 2010

Volume 96, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 96, 042501 (2010); http://dx.doi.org/10.1063/1.3291942 (3 pages)

Daniel Stickler, Robert Frömter, Holger Stillrich, Christian Menk, Carsten Tieg, Simone Streit-Nierobisch, Michael Sprung, Christian Gutt, Lorenz-M. Stadler, Olaf Leupold, Gerhard Grübel, and Hans Peter Oepen
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Experimental verification of light induced field emission

S. Kher, A. Dixit, D. N. Rawat, and M. S. Sodha

Appl. Phys. Lett. 96, 044101 (2010); http://dx.doi.org/10.1063/1.3293297 (2 pages) | Cited 4 times

Online Publication Date: 26 January 2010

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This letter reports the experimental verification of the recently predicted phenomenon that the electric field emission current from a negatively charged surface gets enhanced by incidence of light (even of frequency below the photoelectric threshold) on the cathode.
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79.70.+q Field emission, ionization, evaporation, and desorption
72.40.+w Photoconduction and photovoltaic effects
82.45.Fk Electrodes

Simultaneous mid-range power transfer to multiple devices

André Kurs, Robert Moffatt, and Marin Soljačić

Appl. Phys. Lett. 96, 044102 (2010); http://dx.doi.org/10.1063/1.3284651 (3 pages) | Cited 6 times

Online Publication Date: 26 January 2010

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Electromagnetic resonators strongly coupled through their near-fields [ A. Karalis, J. D. Joannopoulos, and M. Soljačić, Ann. Phys. 323, 34 (2008) ; A. Kurs, A. Karalis, R. Moffatt, J. D. Joannopoulos, P. Fisher, and M. Soljačić, Science 317, 83 (2007) ] are able to achieve efficient wireless power transfer from a source to a device separated by distances multiple times larger than the characteristic sizes of the resonators. This midrange approach is therefore suitable for remotely powering several devices from a single source. We explore the effect of adding multiple devices on the tuning and overall efficiency of the power transfer, and demonstrate this scheme experimentally for the case of coupling objects of different sizes: a large source (1 m2 in area) powering two smaller devices (each ≃ 0.07 m2 in area).
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85.80.-b Thermoelectromagnetic and other devices
84.40.Az Waveguides, transmission lines, striplines

Improvement of the computation of Fourier integrals using the complex plane: Application to acoustic fields

Philippe Gatignol, Catherine Potel, and Nacera Bedrici

Appl. Phys. Lett. 96, 044103 (2010); http://dx.doi.org/10.1063/1.3298359 (3 pages) | Cited 1 time

Online Publication Date: 29 January 2010

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This letter aims at showing the interest in using an integration path in the complex plane in order to calculate Fourier integrals, instead of using a real path, as needed for the fast Fourier transform algorithm as follows: fastness, accuracy, avoiding of singularities, or even aliasing phenomenon. The method is applied to the calculation of the acoustic field emitted by a transducer or a loudspeaker; for the same number of sampling points, the calculation of the spatial Fourier integrals is more accurate using a complex path than using a real path.
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43.20.Bi Mathematical theory of wave propagation
02.30.Nw Fourier analysis
02.30.Uu Integral transforms
02.60.Jh Numerical differentiation and integration
02.30.Cj Measure and integration

Optical loss compensation in a bulk left-handed metamaterial by the gain in quantum dots

Zheng-Gao Dong, Hui Liu, Tao Li, Zhi-Hong Zhu, Shu-Ming Wang, Jing-Xiao Cao, Shi-Ning Zhu, and X. Zhang

Appl. Phys. Lett. 96, 044104 (2010); http://dx.doi.org/10.1063/1.3302409 (3 pages) | Cited 17 times

Online Publication Date: 29 January 2010

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A bulk left-handed metamaterial with fishnet structure is investigated to show the optical loss compensation via surface plasmon amplification with the assistance of the gain medium of PbS quantum dots. Simultaneously negative permittivity and permeability are confirmed at the telecommunication wavelength (1.5 μm) by the retrieval of the effective electromagnetic property. The dependence of enhanced transmission on the gain coefficient, as well as on the propagation layers, demonstrates that ultralow loss is feasible in bulk left-handed metamaterials.
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42.70.-a Optical materials
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

Eddy current induced magnetoelectricity in a piezoelectric unimorph bender

B. Guiffard, D. Guyomar, L. Garbuio, R. Belouadah, J. Zhang, and P. J. Cottinet

Appl. Phys. Lett. 96, 044105 (2010); http://dx.doi.org/10.1063/1.3298551 (3 pages) | Cited 3 times

Online Publication Date: 29 January 2010

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Here, we report on a magnetoelectric (ME) coupling in a simple piezoelectric unimorph bender induced by the eddy currents within the silver electrodes of the piezoelectric ceramic Pb(Zr,Ti)O3 (PZT) subjected to ac magnetic flux. Eddy currents and the applied magnetic field generate Lorentz forces in the metal electrode acting on the PZT. A magnetically induced piezoelectric current linear versus dc magnetic biases is obtained at the ceramic electrodes. ME coupling is finally achieved with only one piezoelectric bender: (i) no magnetic phase is required, (ii) no ac current supply is necessary, eddy currents in electrodes are sufficient to generate Lorentz forces.
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75.85.+t Magnetoelectric effects, multiferroics
77.65.-j Piezoelectricity and electromechanical effects
81.40.Lm Deformation, plasticity, and creep
62.20.F- Deformation and plasticity
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