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3 Sep 2012

Volume 101, Issue 10, Articles (10xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 101, 103101 (2012); http://dx.doi.org/10.1063/1.4748099 (5 pages)

Massimo Cuscunà, Annalisa Convertino, Emiliano Zampetti, Antonella Macagnano, Alessandro Pecora, Guglielmo Fortunato, Laura Felisari, Giuseppe Nicotra, Corrado Spinella, and Faustino Martelli
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Temporal evolution of dielectric barrier discharge microplasma

Marius Blajan and Kazuo Shimizu

Appl. Phys. Lett. 101, 104101 (2012); http://dx.doi.org/10.1063/1.4749825 (4 pages)

Online Publication Date: 4 September 2012

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Analysis of dielectric barrier discharge microplasma at atmospheric pressure was carried out using emission spectroscopy and imaging techniques. Temporal evolution of the discharge and also its filamentary mode was observed for the discharge in 3% N2 in Ar at the microdischarge level. Light emission from microplasma observed with the fast intensified charge coupled device (ICCD) camera for imaging was correlated with the evolution of the discharge current. The highest intensity of light emission occurred at the peak of the discharge current. The evolution of the discharge showed streamer reaching cathode, cathode layer formation, cathode layer enhancement, and cathode layer decay. Measurements of the Ar I peak at 696.5 nm and N2 second positive band system (N2 SPS) peak at 337.1 nm with the ICCD camera and spectrometer at various times corresponding to the discharge current showed similar time evolution as observed with the ICCD camera for imaging.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.25.Fi Transport properties
52.80.-s Electric discharges
52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)

Photopatternable nano-composite (SU-8/ZnO) thin films for piezo-electric applications

Manoj Kandpal, Chandrashekhar Sharan, Pankaj Poddar, K. Prashanthi, Prakash R. Apte, and V. Ramgopal Rao

Appl. Phys. Lett. 101, 104102 (2012); http://dx.doi.org/10.1063/1.4748575 (5 pages) | Cited 1 time

Online Publication Date: 4 September 2012

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Photo-curable nanocomposite material was formulated by embedding ZnO nanoparticles into a SU-8 matrix and studied for its piezoelectric properties for low cost fabrication of self-powered nanodevices. The piezoelectric coefficient of ZnO nanoparticles was observed to be ranging between 15 and 23 pm/V, which is the highest reported. These experimental studies support the recent theoretical predictions where the piezoelectric coefficients in ZnO nanoparticles were found to be higher compared to the thin films because of the surface relaxation induced volume reductions in the nanometer scale. The photo-curable property of these polymer composite films is exploited to demonstrate fabrication of a micro-cantilever test structure.
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77.55.hn Other piezoelectric or electrostrictive films
77.84.Lf Composite materials
81.07.Bc Nanocrystalline materials

Acoustic radiation efficiency of a periodically corrugated rigid piston

Héctor Estrada, Antonio Uris, and Francisco Meseguer

Appl. Phys. Lett. 101, 104103 (2012); http://dx.doi.org/10.1063/1.4748868 (4 pages)

Online Publication Date: 5 September 2012

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The radiation of sound by a periodically corrugated rigid piston is explored using theoretical and numerical approaches and compared with the radiation of flat rigid piston. The depth and the period of the corrugation are considered to be comparable with the wavelength in the surrounding fluid. Radiation enhancement is predicted due to cavity resonances and coherent diffraction. In addition, broad regions of low radiation efficiency are observed. Both effects could have an impact in acoustic transducers technology, either to increase the piston radiated power or to create a source of evanescent acoustic waves. The possibilities offered by this strategy in the nonlinear acoustic regime are also briefly discussed.
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43.38.-p Transduction; acoustical devices for the generation and reproduction of sound
43.25.-x Nonlinear acoustics
43.35.-c Ultrasonics, quantum acoustics, and physical effects of sound
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