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5 Nov 2007

Volume 91, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 91, 191106 (2007); http://dx.doi.org/10.1063/1.2804016 (3 pages)

A. Pikulin, N. Bityurin, G. Langer, D. Brodoceanu, and D. Bäuerle
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Negative reflections of electromagnetic waves in a strong chiral medium

Chao Zhang and Tie Jun Cui

Appl. Phys. Lett. 91, 194101 (2007); http://dx.doi.org/10.1063/1.2804124 (3 pages) | Cited 15 times

Online Publication Date: 6 November 2007

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We investigate the reflection properties of electromagnetic/optical waves in isotropic lossless and lossy chiral media. When the chiral parameter is strong enough, we show that an unusual negative reflection occurs at the interface between a chiral medium and a perfectly conducting plane, where the incident wave and one of the reflected eigenwaves lie in the same side of the interface normal. Using such a property, we further demonstrate the focusing ability of such a conducting plane in the strong chiral medium.
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41.20.Jb Electromagnetic wave propagation; radiowave propagation
42.25.Gy Edge and boundary effects; reflection and refraction

Superconductivity as a tool for solid mechanics

Anca Antonevici, Alain Villaume, and Catherine Villard

Appl. Phys. Lett. 91, 194102 (2007); http://dx.doi.org/10.1063/1.2802070 (3 pages) | Cited 2 times

Online Publication Date: 6 November 2007

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The critical current, a key parameter characterizing the performances of coated conductors (CCs), can be used to probe the plasticity behavior of their metallic substrates. More generally, transport measurements in the superconducting state improve the usual electrical methods employed in solid mechanics to monitor cracks growth and velocity toward higher precisions without any calibration step. The particular case of the development of Lüder bands in a CC Hastelloy substrate is studied via the damaging of the fragile DyBCO superconducting layer deposited on the top of it. Magneto-optics completes the macroscopic data obtained from transport measurements by local morphological observations.
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74.25.Ld Mechanical and acoustical properties, elasticity, and ultrasonic attenuation
74.72.-h Cuprate superconductors
74.25.Sv Critical currents
62.20.F- Deformation and plasticity
62.20.M- Structural failure of materials

Undulation of sub-100 nm porous dielectric structures: A mechanical analysis

M. Darnon, T. Chevolleau, O. Joubert, S. Maitrejean, J. C. Barbe, and J. Torres

Appl. Phys. Lett. 91, 194103 (2007); http://dx.doi.org/10.1063/1.2805774 (3 pages) | Cited 4 times

Online Publication Date: 6 November 2007

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In microelectronics technologies, patterning of sub-100 nm width ridges capped with a titanium nitride mask can lead to undulations of the ridges detrimental to performances. This phenomenon is observed with highly compressive residual stress into the mask (>2 GPa), with dielectrics with low elastic properties (E<2 Gpa) and with high dielectric ridge heights (>230 nm). Experiments and simulations show that undulations can originate from buckling which allows the release of the strain energy initially stored in the mask. Simulations predict that the dielectric material undulations can become an issue for porous dielectrics integration in the next generations of integrated circuits (2016 and later).
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81.16.Rf Micro- and nanoscale pattern formation
85.40.Ls Metallization, contacts, interconnects; device isolation
85.40.Hp Lithography, masks and pattern transfer
77.55.-g Dielectric thin films
81.40.Jj Elasticity and anelasticity, stress-strain relations
81.40.Lm Deformation, plasticity, and creep

Transmission of single mode ultrathin terahertz photonic crystal slabs

Cristo Yee, Nathan Jukam, and Mark Sherwin

Appl. Phys. Lett. 91, 194104 (2007); http://dx.doi.org/10.1063/1.2806227 (3 pages) | Cited 2 times

Online Publication Date: 6 November 2007

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Silicon photonic crystal slabs (PCSs) were fabricated using a reactive ion etching technique. The PCSs consist of a triangular lattice of holes with a lattice constant a = 64 μm, radius r = 0.3a, and a thickness of 0.75a. An optical bandgap from 1.15 to 1.56 THz for transverse electric modes was measured using Fourier transform infrared spectroscopy. The optical bandgap is in good agreement with the finite difference time domain and frequency domain predictions.
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42.70.Qs Photonic bandgap materials
78.30.-j Infrared and Raman spectra
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

Pattern identification using lattice spin systems: A thermodynamic formalism

Shalabh Gupta and Asok Ray

Appl. Phys. Lett. 91, 194105 (2007); http://dx.doi.org/10.1063/1.2807686 (3 pages) | Cited 6 times

Online Publication Date: 7 November 2007

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The paper addresses data-driven statistical pattern identification in complex dynamical systems, where the concept is built upon thermodynamic formalism of symbolic data sequences in the setting of lattice spin systems. The transfer matrix approach has been used for generation of pattern vectors from time series data of observed parameters. Efficacy of pattern identification is demonstrated for early detection of anomalies (i.e., deviations from the nominal pattern) on an experimental apparatus of nonlinear active electronic circuits.
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05.50.+q Lattice theory and statistics (Ising, Potts, etc.)
05.45.Tp Time series analysis
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