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2 Dec 2002

Volume 81, Issue 23, pp. 4315-4476

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Effect of charge transport through silicon nitride on thin gate oxide reliability

A. Cacciato, A. Scarpa, S. Evseev, and M. Diekema

Appl. Phys. Lett. 81, 4464 (2002); http://dx.doi.org/10.1063/1.1526456 (3 pages) | Cited 4 times

Online Publication Date: 25 November 2002

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It is shown that photoconduction is triggered in silicon nitride films when they are exposed to plasma. As a consequence of the increased conductivity, they can act as antennas, being able to collect charges from unstable plasmas and inject them into the gate oxide, thus causing charging damage. The importance of this phenomenon for deep submicron microelectronic manufacturing is discussed. © 2002 American Institute of Physics.
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85.30.Tv Field effect devices
81.65.Cf Surface cleaning, etching, patterning
73.50.Pz Photoconduction and photovoltaic effects

Performance of an x-ray microcalorimeter under ac biasing

J. van der Kuur, P. A. J. de Korte, H. F. C. Hoevers, M. Kiviranta, and H. Seppä

Appl. Phys. Lett. 81, 4467 (2002); http://dx.doi.org/10.1063/1.1526168 (3 pages) | Cited 4 times

Online Publication Date: 25 November 2002

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Frequency domain multiplexing (FDM) is an attractive option for the readout of imaging arrays of microcalorimeters. Implementation of FDM requires ac biasing of the individual microcalorimeters. In this letter we present a small signal model for the behavior of a microcalorimeter under ac bias. Moreover, we have measured the behavior of the same microcalorimeter under ac (at 46 kHz) and dc bias. These experiments show that the performance of the device is very similar in terms of energy resolution, pulse shapes, and current–voltage characteristics. The measured energy resolution at 5.89 keV is 6.9 eV for ac bias and 5.5 eV for dc bias. The effective time constant in both cases is 100 μs. © 2002 American Institute of Physics.
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07.85.Fv X- and γ-ray sources, mirrors, gratings, and detectors
29.40.Vj Calorimeters
29.30.Kv X- and γ-ray spectroscopy
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Losses for microwave transmission in metamaterials for producing left-handed materials: The strip wires

E. V. Ponizovskaya, M. Nieto-Vesperinas, and N. Garcia

Appl. Phys. Lett. 81, 4470 (2002); http://dx.doi.org/10.1063/1.1527982 (3 pages) | Cited 8 times

Online Publication Date: 25 November 2002

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This letter shows that the effective permittivity ϵ for those metamaterials so far used to obtain a left-handed medium, consisting of 0.003 cm thick Cu strip wires, is dominated by the imaginary part of ϵ at 10.6–11.5 GHz frequencies. This is the region of a bandpass filter for microwaves, and therefore there is no propagation since the wave is inhomogeneous inside the medium. We compare with results of Shelby et al. [Appl. Phys. Lett. 78, 489 (2001)], and find that those are in error by ten orders of magnitude of the transmitted power. Also, from finite-difference time-domain calculations using the actual permittivity value of the Cu wires, we demonstrate that when the structure contains thicker wires, the losses are then reduced and the negative part of the permittivity dominates. Since the thickness of the wires is critical for the realization of a good transparent left-handed material, we propose that the strip wires should have thickness of 0.07–0.1 cm and the split ring resonators should be 0.030–0.06 cm thick. © 2002 American Institute of Physics.
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84.40.Az Waveguides, transmission lines, striplines
77.22.Ch Permittivity (dielectric function)
84.30.Vn Filters
02.70.Bf Finite-difference methods

Classical field descriptions for ultrashort tightly-focused laser pulses

P. X. Wang and J. X. Wang

Appl. Phys. Lett. 81, 4473 (2002); http://dx.doi.org/10.1063/1.1521252 (3 pages) | Cited 8 times

Online Publication Date: 25 November 2002

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The wave equations for an ultrashort tightly-focused laser pulse in Hermite–Gaussian (0,0) mode are solved approximately. We obtain the analytical field expressions, which are exact up to the second order of the parameters 1/(k0L) and 1/(k0w0) (k0 is the laser wave number, w0 the laser beam waist, and L the laser pulse length). Our solutions can be reduced to usual paraxial ones naturally and more precise compared with the usual paraxial ones. © 2002 American Institute of Physics.
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42.55.Ah General laser theory
42.60.Fc Modulation, tuning, and mode locking
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Erratum: “Bright electroluminescence from a conjugated dendrimer” [Appl. Phys. Lett. 81, 2285 (2002)]

Dongge Ma, Shih-Chun Lo, P. L. Burn, J. M. Lupton, and I. D. W. Samuel

Appl. Phys. Lett. 81, 4476 (2002); http://dx.doi.org/10.1063/1.1524029 (1 page)

Online Publication Date: 25 November 2002

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Abstract Unavailable
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85.60.Jb Light-emitting devices
78.60.Fi Electroluminescence
78.55.Kz Solid organic materials
42.70.Jk Polymers and organics
99.10.Cd Errata
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