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1 Oct 2012

Volume 101, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 101, 141101 (2012); http://dx.doi.org/10.1063/1.4742864 (4 pages)

Po-Hsun Huang, Michael Ian Lapsley, Daniel Ahmed, Yuchao Chen, Lin Wang, and Tony Jun Huang
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Multi-range free-electron laser with a pair of dielectric multilayer mirrors

Norihiro Sei, Hiroshi Ogawa, and Kawakatsu Yamada

Appl. Phys. Lett. 101, 144101 (2012); http://dx.doi.org/10.1063/1.4756912 (4 pages)

Online Publication Date: 1 October 2012

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We report the experimental achievement of a free-electron laser in three wavelength regions, mid-infrared, near-infrared, and visible, using a pair of dielectric multilayer mirrors in the storage ring NIJI-IV. Dielectric multilayer mirrors can have high reflectivity at wavelength regions corresponding to higher-diffraction orders of the target wavelength. A narrowing of the relative bandwidth of the dielectric multilayer mirrors was observed in the higher-diffraction orders of the target wavelength and was found to be caused by high diffraction and carbon contamination. Our experimental results will be applied to development of a multi-rang laser that have a gain in a wade wavelength region.
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41.60.Cr Free-electron lasers
42.79.Bh Lenses, prisms and mirrors
42.79.Wc Optical coatings

Direct current pulse train actuation to enhance droplet control in digital microfluidics

Miguel A. Murran and Homayoun Najjaran

Appl. Phys. Lett. 101, 144102 (2012); http://dx.doi.org/10.1063/1.4756914 (4 pages)

Online Publication Date: 1 October 2012

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The effective operation of a digital microfluidic (DMF) device depends on its ability to actuate droplets. Pulse width modulation of actuating signals (DC pulse train actuation) is proposed as a practical digital implementation and enhanced droplet manipulation technique. Experimental and simulation results demonstrate the efficacy of droplet incremental displacement and velocity control by modulating the width of each actuation pulse. This will in turn enable the control of the non-linear droplet transport dynamics to minimize droplet position overshoot, deformation, and fragmentation. As a result, DCPT actuation offers unparalleled control over droplet position and speed in DMF devices.
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07.10.Cm Micromechanical devices and systems

Thermal behavior of bovine serum albumin after exposure to barrier discharge helium plasma jet

R. Jijie, V. Pohoata, and I. Topala

Appl. Phys. Lett. 101, 144103 (2012); http://dx.doi.org/10.1063/1.4757130 (4 pages)

Online Publication Date: 1 October 2012

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Non-thermal plasma jets at atmospheric pressure are useful tools nowadays in plasma medicine. Various applications are tested such as cauterization, coagulation, wound healing, natural and artificial surfaces decontamination, and sterilization. In order to know more about the effects of gas plasma on biological supramolecules, we exposed protein powders to a barrier discharge helium plasma jet. Then, spectroscopic investigations were carried out in order to obtain information on protein secondary, tertiary, and quaternary structures. We obtained a reduction of the protein alpha-helix content after the plasma exposure and a different behavior, for both thermal denaturation/renaturation kinetics and thermal aggregation process.
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87.14.E- Proteins
87.15.bd Secondary structure
87.15.bg Tertiary structure
87.15.M- Spectra of biomolecules
52.77.-j Plasma applications

Influence of electromagnetic radiation on the power balance in a radiofrequency microdischarge with a hollow needle electrode

B. Despax, O. Pascal, N. Gherardi, N. Naude, A. Belinger, and L. C. Pitchford

Appl. Phys. Lett. 101, 144104 (2012); http://dx.doi.org/10.1063/1.4756900 (4 pages)

Online Publication Date: 2 October 2012

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This study is focused on the power deposition in microplasma jet discharges generated by application of radiofrequency (RF) excitation to a hollow needle electrode. The plasma jet is initiated at atmospheric pressure in open air with a flow of helium through the electrode. We show that in this configuration, a significant part of the injected power is dissipated in electromagnetic radiation. Many recent works have demonstrated the potential of either cold plasma jets or of RF radiation for applications in medicine, and therefore a source that produces both a cold plasma jet and RF radiation could be of interest.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.40.Db Electromagnetic (nonlaser) radiation interactions with plasma
52.50.Dg Plasma sources
52.80.Pi High-frequency and RF discharges

Optical toroidal dipolar response by an asymmetric double-bar metamaterial

Zheng-Gao Dong, J. Zhu, Junsuk Rho, Jia-Qi Li, Changgui Lu, Xiaobo Yin, and X. Zhang

Appl. Phys. Lett. 101, 144105 (2012); http://dx.doi.org/10.1063/1.4757613 (4 pages) | Cited 1 time

Online Publication Date: 3 October 2012

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We demonstrate that the toroidal dipolar response can be realized in the optical regime by designing a feasible nanostructured metamaterial, comprising asymmetric double-bar magnetic resonators assembled into a toroid-like configuration. It is confirmed numerically that an optical toroidal dipolar moment dominates over other moments. This response is characterized by a strong confinement of an E-field component at the toroid center, oriented perpendicular to the H-vortex plane. The resonance-enhanced optical toroidal response can provide an experimental avenue for various interesting optical phenomena associated with the elusive toroidal moment.
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42.70.-a Optical materials
42.79.-e Optical elements, devices, and systems

Microstructure and magnetostriction of melt-spun Fe73Ga27 ribbon

Himalay Basumatary, Mithun Palit, J. Arout Chelvane, D. Arvindha Babu, R. Sarkar, and S. Pandian

Appl. Phys. Lett. 101, 144106 (2012); http://dx.doi.org/10.1063/1.4757136 (4 pages)

Online Publication Date: 4 October 2012

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Melt spun ribbon of Fe73Ga27 was prepared and characterized for microstructural features and magnetostriction. The phase equilibria observed from structural investigations have been correlated with Mossbauer studies. The magnetostriction of the melt spun ribbon has been found to be significantly large compared to the bulk sample. The large magnetostriction is attributed to the absence of ordered fcc (L12) phase in the melt spun ribbon, which is otherwise seen in slow cooled bulk Fe73Ga27 alloy.
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75.80.+q Magnetomechanical effects, magnetostriction
81.05.Bx Metals, semimetals, and alloys
81.30.Fb Solidification
82.80.Ej X-ray, Mössbauer, and other γ-ray spectroscopic analysis methods
64.70.D- Solid-liquid transitions
75.30.Sg Magnetocaloric effect, magnetic cooling
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