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28 Jan 2013

Volume 102, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 102, 041101 (2013); http://dx.doi.org/10.1063/1.4777564 (5 pages)

K. Winkler, C. Schneider, J. Fischer, A. Rahimi-Iman, M. Amthor, A. Forchel, S. Reitzenstein, S. Höfling, and M. Kamp
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Hybrid piezoelectric-inductive flow energy harvesting and dimensionless electroaeroelastic analysis for scaling

J. A. C. Dias, C. De Marqui, Jr., and A. Erturk

Appl. Phys. Lett. 102, 044101 (2013); http://dx.doi.org/10.1063/1.4789433 (5 pages)

Online Publication Date: 28 January 2013

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Piezoelectric and electromagnetic transduction techniques have peculiar advantages to leverage in the growing field of flow energy harvesting from aeroelastic vibrations. This letter presents the concept of hybrid piezoelectric-inductive power generation with electroaeroelastic modeling and simulations. Dimensionless analysis of the coupled system dynamics is indispensable to proper geometric scaling and optimization of aeroelastic energy harvesters. The governing electroaeroelastic equations are given in dimensionless form, and the effects of aeroelastic and electrical properties are investigated in detail toward understanding the dependence of the cut-in speed (flutter speed) and the maximum power output of the harvester on the system parameters.
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85.50.-n Dielectric, ferroelectric, and piezoelectric devices

Collapse of triangular channels in a soft elastomer

Daniel Tepáyotl-Ramírez, Tong Lu, Yong-Lae Park, and Carmel Majidi

Appl. Phys. Lett. 102, 044102 (2013); http://dx.doi.org/10.1063/1.4789762 (4 pages)

Online Publication Date: 28 January 2013

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We extend classical solutions in contact mechanics to examine the collapse of channels in a soft elastomer. These channels have triangular cross-section and collapse when pressure is applied to the surrounding elastomer. Treating the walls of the channel as indenters that penetrate the channel base, we derive an algebraic mapping between pressure and cross-sectional area. These theoretical predictions are in strong agreement with results that we obtain through finite element analysis and experimental measurements. This is accomplished without data fitting and suggests that the theoretical approach may be generalized to a broad range of cross-sectional geometries in soft microfluidics.
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81.05.Lg Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials
62.20.Qp Friction, tribology, and hardness
81.40.Pq Friction, lubrication, and wear

A microfabricated ion trap with integrated microwave circuitry

D. T. C. Allcock, T. P. Harty, C. J. Ballance, B. C. Keitch, N. M. Linke, D. N. Stacey, and D. M. Lucas

Appl. Phys. Lett. 102, 044103 (2013); http://dx.doi.org/10.1063/1.4774299 (4 pages)

Online Publication Date: 29 January 2013

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We describe the design, fabrication, and testing of a surface-electrode ion trap, which incorporates microwave waveguides, resonators, and coupling elements for the manipulation of trapped ion qubits using near-field microwaves. The trap is optimised to give a large microwave field gradient to allow state-dependent manipulation of the ions' motional degrees of freedom, the key to multi-qubit entanglement. The microwave field near the centre of the trap is characterised by driving hyperfine transitions in a single laser-cooled  43Ca+ ion.
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07.10.Cm Micromechanical devices and systems
84.40.Az Waveguides, transmission lines, striplines
85.40.-e Microelectronics: LSI, VLSI, ULSI; integrated circuit fabrication technology
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