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4 Feb 2008

Volume 92, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 92, 053301 (2008); http://dx.doi.org/10.1063/1.2838457 (3 pages)

Michael S. Arnold, Gregory J. McGraw, Stephen R. Forrest, and Richard R. Lunt
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Measurement of dispersive forces between evaporated metal surfaces in the range below 100 nm

P. J. van Zwol, G. Palasantzas, M. van de Schootbrugge, and J. Th. M. De Hosson

Appl. Phys. Lett. 92, 054101 (2008); http://dx.doi.org/10.1063/1.2832664 (3 pages) | Cited 9 times

Online Publication Date: 4 February 2008

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In this work, we describe dispersion force (van der Waals/Casimir) measurements between gold surfaces at separations as close as 12 nm. The force measurements were performed in the plane-sphere configuration by atomic force microscopy at distances ranging between 12 and 200 nm. This was accomplished by using evaporated smooth metal surfaces for both sphere and plane, and stiff cantilevers to minimize jump-to-contact problems. Finally, it is shown that below separations of 100 nm, experiment and theory are found in agreement within 10% by including in the theory the measured optical properties of gold and contribution from surface roughness.
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68.37.Ps Atomic force microscopy (AFM)
78.66.Bz Metals and metallic alloys

Investigation of an oversized backward wave oscillator as a high power microwave generator

Zheng-Hong Li

Appl. Phys. Lett. 92, 054102 (2008); http://dx.doi.org/10.1063/1.2840193 (3 pages) | Cited 17 times

Online Publication Date: 4 February 2008

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An oversized rectangular corrugated backward wave oscillator is designed and theoretically analyzed to produce TM01 high power microwave radiation in the frequency of 8.68 GHz without mode competition. The device includes a slow wave structures, a resonant reflector, and an output waveguide. The slow wave structure and the reflector are matched to achieve mode selection and enhance interaction efficiency. Feedback processes from the reflector are introduced to explore mode selection in the configuration. In particle in cell simulation, high power microwaves of TM01 mode are generated with peak power of 2.0 GW, frequency of 8.68 GHz, and conversion efficiency is 28.6% when beam voltage is 500 kV and current 14 kA.
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84.30.Ng Oscillators, pulse generators, and function generators
84.40.-x Radiowave and microwave (including millimeter wave) technology
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