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12 Sep 2011

Volume 99, Issue 11, Articles (11xxxx)

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Appl. Phys. Lett. 99, 113501 (2011); http://dx.doi.org/10.1063/1.3634072 (3 pages)

Asif Islam Khan, Debanjan Bhowmik, Pu Yu, Sung Joo Kim, Xiaoqing Pan, Ramamoorthy Ramesh, and Sayeef Salahuddin
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A metamaterial-inspired, electrically small rectenna for high-efficiency, low power harvesting and scavenging at the global positioning system L1 frequency

Ning Zhu, Richard W. Ziolkowski, and Hao Xin

Appl. Phys. Lett. 99, 114101 (2011); http://dx.doi.org/10.1063/1.3637045 (3 pages) | Cited 1 time

Online Publication Date: 12 September 2011

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An electrically small rectenna was designed and tested at the global positioning system (GPS) L1 frequency (1.5754 GHz). The metamaterial-inspired near-field resonant parasitic antenna size (ka ∼ 0.467) and its direct match to the input impedance of the rectifying circuit decreased the whole size of the rectenna (ka ∼ 0.611). The simulated and measured rectifying efficiencies were, respectively, 75.7% and 79.6% when the input power to the rectifying circuit was 0.0 dBm (1 mW). The highest rectifying efficiency, 84.7%, was achieved at the GPS L1 frequency for a 3.0 dBm input power. The simulated and measured results are in good agreement.
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84.40.Ba Antennas: theory, components and accessories
84.60.-h Direct energy conversion and storage
84.30.Jc Power electronics; power supply circuits

Traveling wave-induced aerodynamic propulsive forces using piezoelectrically deformed substrates

Noah T. Jafferis, Howard A. Stone, and James C. Sturm

Appl. Phys. Lett. 99, 114102 (2011); http://dx.doi.org/10.1063/1.3637635 (3 pages) | Cited 1 time

Online Publication Date: 13 September 2011

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We use integrated piezoelectric actuators and sensors to demonstrate the propulsive force produced by controllable transverse traveling waves in a thin plastic sheet suspended in air above a flat surface, thus confirming the physical basis for a “flying” carpet near a horizontal surface. Experiments are conducted to determine the dependence of the force on the height above the ground and the amplitude of the traveling wave, which qualitatively confirm previous theoretical predictions.
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47.85.Gj Aerodynamics
85.50.-n Dielectric, ferroelectric, and piezoelectric devices
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Elastic relaxation in an ultrathin strained silicon-on-insulator structure

Gang Xiong, Oussama Moutanabbir, Xiaojing Huang, Seyed A. Paknejad, Xiaowen Shi, Ross Harder, Manfred Reiche, and Ian K. Robinson

Appl. Phys. Lett. 99, 114103 (2011); http://dx.doi.org/10.1063/1.3637634 (3 pages) | Cited 4 times

Online Publication Date: 16 September 2011

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Coherent x-ray diffraction was used to study the relaxation in single ultrathin strained silicon structures with nanoscale accuracy. The investigated structure was patterned from 20 nm thick strained silicon-on-insulator substrate with an initial biaxial tensile strain of 0.6%. Two-dimensional maps of the post-patterning relaxation were obtained for single 1 × 1 μm2 structures. We found that the relaxation is localized near the edges, which undergo a significant contraction due to the formation of free surfaces. The relaxation extent decreases exponentially towards the center with a decay length of 50 nm. Three-dimensional simulations confirmed that over-etching is needed to explain the relaxation behavior.
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81.40.Jj Elasticity and anelasticity, stress-strain relations
62.40.+i Anelasticity, internal friction, stress relaxation, and mechanical resonances
81.65.Cf Surface cleaning, etching, patterning
68.60.Bs Mechanical and acoustical properties
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