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26 Mar 2012

Volume 100, Issue 13, Articles (13xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 100, 133701 (2012); http://dx.doi.org/10.1063/1.3696019 (3 pages)

Hewei Liu, Feng Chen, Qing Yang, Pubo Qu, Shengguan He, Xianhua Wang, Jinhai Si, and Xun Hou
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Enhancing the photoluminescence of ferroelectric liquid crystal by doping with ZnS quantum dots

A. Kumar, J. Prakash, Abhay D. Deshmukh, D. Haranath, P. Silotia, and A. M. Biradar

Appl. Phys. Lett. 100, 134101 (2012); http://dx.doi.org/10.1063/1.3698120 (4 pages) | Cited 5 times

Online Publication Date: 27 March 2012

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We report the enhancement in photoluminescence (PL) intensity and shift in spectral energy band of ferroelectric liquid crystal (FLC) doped with ZnS quantum dots (QDs). The emission from ZnS QDs has combined constructively with that of FLC to give enhanced PL intensity. On the other hand, the smectic phases of FLC provided strong light scattering and hence improved the PL intensity of the composite. The change in effective refractive index of FLC due to different concentrations of ZnS QDs has caused the red shift. Our observations will certainly provide a promising tool in the realization of enhanced PL-LC display devices.
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78.55.Bq Liquids
78.15.+e Optical properties of fluid materials, supercritical fluids and liquid crystals
61.30.Eb Experimental determinations of smectic, nematic, cholesteric, and other structures
77.80.-e Ferroelectricity and antiferroelectricity
77.84.Nh Liquids, emulsions, and suspensions; liquid crystals
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

On the generation and disruption of a picosecond runaway electron beam during the breakdown of an atmospheric-pressure gas gap

S. A. Barengolts, G. A. Mesyats, M. M. Tsventoukh, and I. V. Uimanov

Appl. Phys. Lett. 100, 134102 (2012); http://dx.doi.org/10.1063/1.3697991 (4 pages)

Online Publication Date: 29 March 2012

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The generation and disruption of the picosecond runaway electron beam in atmospheric pressure strongly overvolted gas gap is considered with emphasis on the runaway kinetics, the increase in emission current and plasma density, and beam instabilities. It has been shown that a few-nanosecond ten-kV prepulse gives rise to a streamer. Application of the main pulse (∼2 MV/ns) results in the runaway electron beam generation with the streamer electrons involved in the acceleration, and in increase of the electron emission from the cathode and the plasma density. At the high enough plasma density, fast beam instability disrupts the runaway electron beam.
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52.25.Fi Transport properties
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.35.Qz Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.)
52.80.-s Electric discharges

Hundreds MeV monoenergetic proton bunch from interaction of 1020–21 W/cm2 circularly polarized laser pulse with tailored complex target

Z. M. Zhang (张智猛), X. T. He (贺贤土), Z. M. Sheng (盛正卯), and M. Y. Yu (郁明阳)

Appl. Phys. Lett. 100, 134103 (2012); http://dx.doi.org/10.1063/1.3696885 (4 pages) | Cited 1 time

Online Publication Date: 29 March 2012

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A complex target (CT) configuration tailored for generating high quality proton bunch by circularly polarized laser pulses at intensities of 1020-21 W/cm2 is proposed. Two-dimensional particle-in-cell simulations show that both the collimation and mono-energetic qualities of the accelerated proton bunch obtained using a front-shaped thin foil can be greatly enhanced by the backside inhomogeneous plasma layer. The main mechanisms for improving the accelerated protons are identified and discussed. These include stabilization of the photon cavity, providing hole-boring supplementary acceleration and suppressing the thermal-electron effects. A theory for tailoring the CT parameters is also presented.
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29.25.-t Particle sources and targets
29.27.Eg Beam handling; beam transport
41.85.Si Particle beam collimators, monochromators
52.38.Kd Laser-plasma acceleration of electrons and ions
52.40.Mj Particle beam interactions in plasmas

Coupled Monte Carlo-Poisson method for the simulation of particle-particle effects in dielectrophoretic devices

A. La Magna, M. Camarda, I. Deretzis, G. Fisicaro, and S. Coffa

Appl. Phys. Lett. 100, 134104 (2012); http://dx.doi.org/10.1063/1.3697733 (5 pages) | Cited 1 time

Online Publication Date: 29 March 2012

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Simulations can aid to bridge the gap between the proof-of-concept stage and the engineering of dielectrophoretic devices. We present a simulation method overcoming the limits of fluid-flow based approaches. In our Monte-Carlo-Poisson simulator, the colloidal system is described at the particle resolution. This characteristic allows for taking into account volume forces and particle-particle interactions usually neglected in the continuum approximation. In turn, large number of particles and large systems can be simulated to meet the device design needs. In an experimentally verifiable case study, we discuss the role of the multi-particle interaction in high and moderate density regimes.
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85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
07.10.Cm Micromechanical devices and systems
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