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7 Jun 2010

Volume 96, Issue 23, Articles (23xxxx)

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Appl. Phys. Lett. 96, 231104 (2010); http://dx.doi.org/10.1063/1.3443734 (3 pages)

Hiroto Sekiguchi, Katsumi Kishino, and Akihiko Kikuchi
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The impact of nonlinearity on degenerate parametric amplifiers

Jeffrey F. Rhoads and Steven W. Shaw

Appl. Phys. Lett. 96, 234101 (2010); http://dx.doi.org/10.1063/1.3446851 (3 pages) | Cited 6 times

Online Publication Date: 7 June 2010

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This work investigates the effects of system nonlinearities on degenerate parametric amplifiers. A simple, Duffing-type nonlinearity is appended to a representative equation of motion for a mechanical or electromechanical parametric amplifier, and classical perturbation methods are used to characterize the resulting effects on the amplifier’s frequency response and performance. Ultimately, the work demonstrates that parametric amplification can be realized in nonlinear, dynamic-range limited systems, such as resonant micro- or nanosystems, but at the expense of performance degradation. Additionally, it is shown that nonlinear amplifiers can be operated above their linear instability threshold but that doing so results in bistable amplified responses.
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84.30.Le Amplifiers
84.30.Bv Circuit theory

Generation of gigawatt level beat waves

Guolin Li, Ting Shu, Jun Zhang, Jianhua Yang, and Chengwei Yuan

Appl. Phys. Lett. 96, 234102 (2010); http://dx.doi.org/10.1063/1.3449134 (3 pages) | Cited 6 times

Online Publication Date: 7 June 2010

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The initial experimental results of generating gigawatt level beat waves with two microwave sources are presented. The detailed measures for enhancing the power handling capacities of the applied devices are explained. In the experiments, the operation frequencies of the microwave sources are 9.41 GHz and 9.59 GHz, respectively. The microwave sources are driven by a single accelerator capable of producing dual electron beams to make sure that they are operating simultaneously. The beat frequencies, measured by the oscilloscope directly, are about 180 MHz, and the peak powers of the pulsed beat waves are about 4.3 GW with durations of about 40 ns.
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84.40.-x Radiowave and microwave (including millimeter wave) technology
07.07.Hj Display and recording equipment, oscilloscopes, TV cameras, etc.

Directed rebounding of droplets by microscale surface roughness gradients

Bernard A. Malouin, Nikhil A. Koratkar, Amir H. Hirsa, and Zuankai Wang

Appl. Phys. Lett. 96, 234103 (2010); http://dx.doi.org/10.1063/1.3442500 (3 pages) | Cited 4 times

Online Publication Date: 9 June 2010

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Impact dynamics of water droplets on superhydrophobic surfaces with different textures are known to vary dramatically, from total rebounding to complete sticking. Here we show that droplet rebounding on textured surfaces can be significantly influenced by the uniformity of the surface roughness. By engineering nonuniform textures (i.e., roughness gradients) on the surface, we are able to not only manipulate the axial rebound of the droplet, but also introduce a prescribed lateral component to the rebound trajectory. The measured directed rebounding is shown to fit a simple model balancing droplet inertia against the Young’s force imbalance from side to side.
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68.35.B- Structure of clean surfaces (and surface reconstruction)
68.08.Bc Wetting
46.55.+d Tribology and mechanical contacts
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