JAP: Interdisciplinary and General Physics http://scitation.aip.org/ JAP: Interdisciplinary and General Physics Phononic crystal diffraction gratings http://link.aip.org/link/?JAP/111/034907/1&agg=rss Rayisa P. Moiseyenko, Sarah Herbison, Nico F. Declercq, and Vincent Laude<br/> When a phononic crystal is interrogated by an external source of acoustic waves, there is necessarily a phenomenon of diffraction occurring on the external enclosing surfaces. Indeed, these external surfaces are periodic and the resulting acoustic diffraction grating has a periodicity that depends o ... [J. Appl. Phys. 111, 034907 (2012)] published Fri Feb 10, 2012. Dopant effects on solid phase epitaxy in silicon and germanium http://link.aip.org/link/?JAP/111/034906/1&agg=rss B. C. Johnson, T. Ohshima, and J. C. McCallum<br/> The kinetics of dopant-enhanced solid phase epitaxy (SPE) are studied in amorphous silicon (a-Si) and germanium (a-Ge) layers formed by ion implantation. Implanted Sb dopants into a-Ge up to a concentration of 1 x 10cm are considered and compared to As implanted layers at similar concentrations. A ... [J. Appl. Phys. 111, 034906 (2012)] published Thu Feb 9, 2012. Impact of scaling of dielectric thickness on mobility in top-contact pentacene organic thin film transistors http://link.aip.org/link/?JAP/111/034905/1&agg=rss Vinay Kumar Singh and Baquer Mazhari<br/> The effect of scaling of poly(methylmethacrylate) (PMMA) and cross-linkable poly(4-vinylphenol) (PVP) polymer dielectric thickness on field effect mobility in top contact pentance organic thin film transistors was investigated. Mobility at a constant gate voltage improved significantly with reductio ... [J. Appl. Phys. 111, 034905 (2012)] published Wed Feb 8, 2012. Na incorporation into Cu(In,Ga)Se thin-film solar cell absorbers deposited on polyimide: Impact on the chemical and electronic surface structure http://link.aip.org/link/?JAP/111/034903/1&agg=rss X. Song, R. Caballero, R. Felix, D. Gerlach, C. A. Kaufmann et al.<br/> Na has deliberately been incorporated into Cu(In,Ga)Se (CIGSe) chalcopyrite thin-film solar cell absorbers deposited on Mo-coated polyimide flexible substrates by adding differently thick layers of NaF in-between CIGSe absorber and Mo back contact. The impact of Na on the chemical and electronic sur ... [J. Appl. Phys. 111, 034903 (2012)] published Mon Feb 6, 2012. Synchronization of fluid-dynamics related and physiological time scales and algal biomass production in thin flat-plate bioreactors http://link.aip.org/link/?JAP/111/034904/1&agg=rss Alemayehu Kasahun Gebremariam and Yair Zarmi<br/> Experiments on ultrahigh density unicellular algae cultures in thin flat-plate bioreactors (thickness <=2 cm) indicate that: i) Optimal areal biomass production rates are significantly higher than in traditional ponds or raceways, ii) productivity grows for radiation levels substantially higher than ... [J. Appl. Phys. 111, 034904 (2012)] published Mon Feb 6, 2012. Silver nano particle formation on Ar plasma treated cinnamyl alcohol http://link.aip.org/link/?JAP/111/034902/1&agg=rss S. Dahle, M. Marschewski, L. Wegewitz, W. Viol, and W. Maus-Friedrichs<br/> Metastable induced electron spectroscopy, ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy are employed to study the adsorption of silver on cinnamyl alcohol films prepared on Au(111) substrates by thermal evaporation. Additionally, the impact of ... [J. Appl. Phys. 111, 034902 (2012)] published Fri Feb 3, 2012. Bistatic scattering characterization of a three-dimensional broadband cloaking structure http://link.aip.org/link/?JAP/111/034901/1&agg=rss Pekka Alitalo, Ali E. Culhaoglu, Andrey V. Osipov, Stefan Thurner, Erich Kemptner et al.<br/> Here we present the results of full experimental characterization of broadband cloaking of a finite-sized metallic cylinder at X-band. The cloaking effect is characterized by measuring the bistatic scattering patterns of uncloaked and cloaked objects in free space and then comparing these with each ... [J. Appl. Phys. 111, 034901 (2012)] published Fri Feb 3, 2012. A technique for physical realization of anisotropic density matrices with application to acoustic beam shifters http://link.aip.org/link/?JAP/111/024907/1&agg=rss Wael Akl and Amr Baz<br/> Physical realization of acoustic metamaterials is so far at its initial stages, with attempts to use periodic patterns of engineered material structures to achieve various material properties that would yield the required wave propagation patterns. Phononic crystals are by far the most advanced tech ... [J. Appl. Phys. 111, 024907 (2012)] published Wed Jan 25, 2012. X-ray detection capability of a BaCl single crystal scintillator http://link.aip.org/link/?JAP/111/024906/1&agg=rss Masanori Koshimizu, Kazuya Onodera, Fumihiko Nishikido, Rie Haruki, Kengo Shibuya et al.<br/> The x-ray detection capability of a scintillation detector equipped with a BaCl single crystal was evaluated. The scintillation decay kinetics can be expressed by a sum of two exponential decay components. The fast and slow components have lifetimes of 1.5 and 85 ns, respectively. The total light ou ... [J. Appl. Phys. 111, 024906 (2012)] published Tue Jan 24, 2012. The effect of a compliant substrate on the electromigration-driven surface morphological stabilization of an epitaxial thin film http://link.aip.org/link/?JAP/111/024905/1&agg=rss Georgios I. Sfyris, M. Rauf Gungor, and Dimitrios Maroudas<br/> We analyze the surface morphological stability of a coherently strained thin film that has been grown epitaxially on a compliant substrate of finite thickness and is subjected simultaneously to an external electric field, which drives surface electromigration. The compliant substrate has the ability ... [J. Appl. Phys. 111, 024905 (2012)] published Mon Jan 23, 2012. Measurement of insulating and dielectric properties of acrylic elastomer membranes at high electric fields http://link.aip.org/link/?JAP/111/024904/1&agg=rss L. Di Lillo, A. Schmidt, D. A. Carnelli, P. Ermanni, G. Kovacs et al.<br/> This work reports on the investigation of VHB 4910 acrylic elastomer insulating and dielectric properties. This material is widely exploited for the realization of actuators with large deformations, dielectric elastomer actuators (DEA), and belongs to the group of so-called electroactive polymers (E ... [J. Appl. Phys. 111, 024904 (2012)] published Thu Jan 19, 2012. Effects of electron-phonon coupling and electron diffusion on ripples growth on ultrafast-laser-irradiated metals http://link.aip.org/link/?JAP/111/024902/1&agg=rss J. P. Colombier, F. Garrelie, N. Faure, S. Reynaud, M. Bounhalli et al.<br/> Metals exposed to ultrafast laser irradiation close to ablative regimes show often a submicron-scale (near 0.5 [mu]m) periodic organization of the surface as ripples. Using two classes of metallic materials (transition and noble), we have determined that the ripples amplitude is strongly correlated ... [J. Appl. Phys. 111, 024902 (2012)] published Tue Jan 17, 2012. Repetitive impact loading causes local plastic deformation in wood http://link.aip.org/link/?JAP/111/024901/1&agg=rss Ari Salmi, Lauri I. Salminen, Birgitta A. Engberg, Tomas Bjorkqvist, and Edward Haeggstrom<br/> The relationship between the impactor velocity and the amount of strain localization in a single impact compression of cellular solids is known. However, few studies report on the effects of repeated high frequency compression. We therefore studied the mechanical behavior of Norway spruce, a cellula ... [J. Appl. Phys. 111, 024901 (2012)] published Tue Jan 17, 2012. Evolution of laser-fired aluminum-silicon contact geometry in photovoltaic devices http://link.aip.org/link/?JAP/111/024903/1&agg=rss A. Raghavan, T. A. Palmer, and T. DebRoy<br/> The evolution of temperature and velocity fields during laser processing of solar cells to produce an ohmic contact between an aluminum thin film and a silicon wafer is studied using a transient numerical heat transfer and liquid metal flow model. Since small changes in pulse duration, power, and po ... [J. Appl. Phys. 111, 024903 (2012)] published Tue Jan 17, 2012. Microstructure, transport, and acoustic properties of open-cell foam samples: Experiments and three-dimensional numerical simulations http://link.aip.org/link/?JAP/111/014911/1&agg=rss Camille Perrot, Fabien Chevillotte, Minh Tan Hoang, Guy Bonnet, Francois-Xavier Becot et al.<br/> This article explores the applicability of numerical homogenization techniques for analyzing transport properties in real foam samples, mostly open-cell, to understand long-wavelength acoustics of rigid-frame air-saturated porous media on the basis of microstructural parameters. Experimental charact ... [J. Appl. Phys. 111, 014911 (2012)] published Fri Jan 13, 2012. Characterization of deep levels in n-type and semi-insulating 4H-SiC epitaxial layers by thermally stimulated current spectroscopy http://link.aip.org/link/?JAP/111/014910/1&agg=rss Peter G. Muzykov, Ramesh M. Krishna, and Krishna C. Mandal<br/> We have investigated deep level centers in n-type and semi-insulating (SI) 4H-SiC epitaxial layers by thermally stimulated current (TSC) spectroscopy. The epitaxial layers were grown using chemical vapor deposition utilizing a dichlorosilane precursor. Both epitaxial layers exhibited relatively shal ... [J. Appl. Phys. 111, 014910 (2012)] published Thu Jan 12, 2012. Simulation of the sea of electrons in metals using three-dimensional cell-by-cell automation http://link.aip.org/link/?JAP/111/014909/1&agg=rss David J. Quesnel and Yingrui Zhang<br/> A 3D cellular automation discretely moves electrons in a metal according to combined thermal and electrical driving forces by including all of the metal cations and all of the loosely bound electrons comprising the sea of electrons to compute the local electric fields. This cell-by-cell automation i ... [J. Appl. Phys. 111, 014909 (2012)] published Thu Jan 12, 2012. Studies of pure and nitrogen-incorporated hydrogenated amorphous carbon thin films and their possible application for amorphous silicon solar cells http://link.aip.org/link/?JAP/111/014908/1&agg=rss Neeraj Dwivedi, Sushil Kumar, and Hitendra K. Malik<br/> Hydrogenated amorphous carbon (a-C:H) and nitrogen-incorporated a-C:H (a-C:N:H) thin films were deposited using radio frequencyplasma-enhanced chemical vapor deposition technique and studied for their electrical, optical, and nano-mechanical properties. Introduction of nitrogen and increase of self ... [J. Appl. Phys. 111, 014908 (2012)] published Wed Jan 11, 2012. Tunneling and filtering characteristics of cascaded [eh]-negative metamaterial layers sandwiched by double-positive layers http://link.aip.org/link/?JAP/111/014906/1&agg=rss Chien-Hao Liu and Nader Behdad<br/> In this paper, we examine the electromagnetic (EM) wave tunneling and filtering characteristics of multi-layer structures composed of an arbitrary number of [eh]-negative (Epsilon-negative or ENG) metamaterial layers sandwiched by very thin double-positive (DPS) layers with high dielectric constant ... [J. Appl. Phys. 111, 014906 (2012)] published Tue Jan 10, 2012. Characteristics of laterally vibrating resonant microcantilevers in viscous liquid media http://link.aip.org/link/?JAP/111/014907/1&agg=rss Russell Cox, Fabien Josse, Stephen M. Heinrich, Oliver Brand, and Isabelle Dufour<br/> The characteristics of microcantilevers vibrating laterally in viscous liquid media are investigated and compared to those of similar microcantilevers vibrating in the out-of-plane direction. The hydrodynamic loading on the vibrating beam is first determined using a numerical model. A semi-analytica ... [J. Appl. Phys. 111, 014907 (2012)] published Tue Jan 10, 2012. Influence of the rheological properties on the electrical impedance of hydrogels http://link.aip.org/link/?JAP/111/014905/1&agg=rss A. L. Alexe-Ionescu, G. Barbero, and C. Meyer<br/> We show that the anomalous frequency dependence of the real part of the electrical impedance of hydrogels can be interpreted by taking into account their non-Newtonian character, according to which the effective viscosity, eta, depends on the frequency of the imposed deformation. Our experimental re ... [J. Appl. Phys. 111, 014905 (2012)] published Fri Jan 6, 2012.