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29 Oct 2007

Volume 91, Issue 18, Articles (18xxxx)

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Appl. Phys. Lett. 91, 183501 (2007); http://dx.doi.org/10.1063/1.2801554 (3 pages)

Aurelien Du Pasquier, Daniel D. T. Mastrogiovanni, Lauren A. Klein, Tong Wang, and Eric Garfunkel
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Three-dimensional curvelets for coherent vortex analysis of turbulence

Jianwei Ma and M. Yousuff Hussaini

Appl. Phys. Lett. 91, 184101 (2007); http://dx.doi.org/10.1063/1.2802051 (3 pages) | Cited 2 times

Online Publication Date: 29 October 2007

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This letter presents a multiscale geometric method based on three-dimensional (3D) second-generation curvelet transform to extract coherent vortices out of 3D turbulent flows. Since the platelike elements of 3D curvelets satisfy the 3D parabolic scaling, and since they form a sparse basis, they optimally represent singular surfaces in three dimensions. This method preserves the edges and structures of extracted vortex tubes better than the conventional wavelets. The effectiveness of the present method is demonstrated in the case of simulation data of 3D homogeneous isotropic turbulence.
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47.32.cb Vortex interactions
47.27.Gs Isotropic turbulence; homogeneous turbulence
47.11.St Multi-scale methods
02.30.Uu Integral transforms

Frequency selective surfaces for high sensitivity terahertz sensing

Christian Debus and Peter Haring Bolivar

Appl. Phys. Lett. 91, 184102 (2007); http://dx.doi.org/10.1063/1.2805016 (3 pages) | Cited 44 times

Online Publication Date: 30 October 2007

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An apporach for the sensing of small amounts of chemical and biochemical material is presented. A frequency selective surface made from asymmetric split ring resonators is excited with free space radiation. Due to interference effects a resonance occurs with a steep flank in the frequency response which is shifted upon dielectric loading. Utilizing a strong E-field concentration by selective loading the detection of very small amounts of probe material becomes possible. The functionality is proven by numerical simulation and the optimization of structure and loading is performed.
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07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing

Elastometric sensing using higher flexural eigenmodes of microcantilevers

Matthew Spletzer, Arvind Raman, and Ron Reifenberger

Appl. Phys. Lett. 91, 184103 (2007); http://dx.doi.org/10.1063/1.2803215 (3 pages) | Cited 6 times

Online Publication Date: 1 November 2007

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We present a method to detect with high sensitivity the viscoelastic property changes of sensor coatings on microcantilever arrays due to radiation, analyte binding, or adsorption. The method uses higher order flexural eigenmodes to identify the location and magnitude of the nonuniform elasticity changes in the microcantilever coating. We demonstrate the method by monitoring the time evolution of resonance frequencies and Q factors of different flexural eigenmodes of microcantilevers functionalized with a small drop of a photosensitive polymer as it is exposed to ultraviolet radiation. The method is particularly well suited for measuring quantitatively the time varying viscoelastic properties of thin films or biological materials attached to microcantilevers.
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07.10.Cm Micromechanical devices and systems
46.35.+z Viscoelasticity, plasticity, viscoplasticity
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)

Low frequency lumped element-based negative index metamaterial

Aycan Erentok, Richard W. Ziolkowski, J. A. Nielsen, R. B. Greegor, C. G. Parazzoli, M. H. Tanielian, Steven A. Cummer, Bogdan-Ioan Popa, Thomas Hand, D. C. Vier, and S. Schultz

Appl. Phys. Lett. 91, 184104 (2007); http://dx.doi.org/10.1063/1.2803771 (3 pages) | Cited 2 times

Online Publication Date: 2 November 2007

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A lumped element-based negative index metamaterial (NIM) was designed, fabricated, and tested for operation at 400 MHz in the ultrahigh frequency (UHF) band. At 400 MHz the measured real part of the index of refraction of this NIM was nreal = −3.11 with a loss that was less than 1 dB/cm using unit cells whose overall size d was λ/d ∼ 75. The NIM bandwidth was >10% in the neighborhood of 400 MHz.
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84.40.-x Radiowave and microwave (including millimeter wave) technology
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