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1 Jan 2007

Volume 90, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 90, 012105 (2007); http://dx.doi.org/10.1063/1.2428402 (3 pages)

Jan Bauer, Frank Fleischer, Otwin Breitenstein, Luise Schubert, Peter Werner, Ulrich Gösele, and Margit Zacharias
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Nanoillumination based on self-focus and field enhancement inside a subwavelength metallic structure

Cheng Liu, Nanguang Chen, and Colin Sheppard

Appl. Phys. Lett. 90, 011501 (2007); http://dx.doi.org/10.1063/1.2425029 (3 pages) | Cited 3 times

Online Publication Date: 2 January 2007

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A subwavelength metallic structure is proposed to generate superstrong nanoillumination. Its attractive features are presented numerically with finite-difference time-domain method. By combining a subwavelength slit and a nanohole together into metallic screen, the light illuminated on the surface of the screen is firstly squeezed into the subwavelength slit with the aid of the generated surface plasmon, and then during propagation to the exit end of the slit, the light is focused on a nanohole fabricated at the bottom of the slit due to the self-imaging effect and is further enhanced by the transmission resonance when passing through the nanohole. Because of these three successive enhancement processes, the light from the nanohole could become thousand times stronger than the incident light and accordingly could have great potentials for applications in optical data storage, super-resolution imaging, lithography, photonics, and other applications that need nanoillumination.
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42.72.-g Optical sources and standards
42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation
78.68.+m Optical properties of surfaces

Thomson scattering diagnostics of the plasma generated in a hollow anode with a ferroelectric plasma source

D. Yarmolich, V. Vekselman, J. Z. Gleizer, Y. Hadas, J. Felsteiner, and Ya. E. Krasik

Appl. Phys. Lett. 90, 011502 (2007); http://dx.doi.org/10.1063/1.2426886 (3 pages) | Cited 3 times

Online Publication Date: 2 January 2007

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Thomson scattering of a laser beam was applied to study the plasma parameters inside a hollow anode having a ferroelectric plasma source incorporated in it. This method allowed avoiding difficulties related to spectroscopical measurements in the case of unknown electron energy distribution. It was found that the electron density and energy of the ferroelectric plasma are ∼ 1015 cm−3 and ⩽ 5 eV, respectively, and the density of the hollow anode bulk plasma is ∼ 6×1013 cm−3. Applying an accelerating pulse for electron extraction from the bulk plasma leads to an increase in the electron density and energy of the ferroelectric plasma up to 6×1016 cm−3 and ⩽ 20 eV, respectively.
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52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.50.Dg Plasma sources
52.38.Ph X-ray, γ-ray, and particle generation

Distribution of electric field in the sheath of an electronegative plasma

K. Takizawa, A. Kono, and K. Sasaki

Appl. Phys. Lett. 90, 011503 (2007); http://dx.doi.org/10.1063/1.2429026 (3 pages) | Cited 9 times

Online Publication Date: 3 January 2007

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The authors measured the distribution of electric field in the sheath formed between an electronegative Ar/SF6 plasma and a biased electrode by laser-induced fluorescence-dip spectroscopy. It was found that the electric field in the sheath of an electronegative plasma had a stepwise structure, which was due to the reflection of negative ions at a localized distance from the electrode. The electric field observed in an electronegative plasma was compared with a theoretical calculation based on a fluid model.
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52.40.Kh Plasma sheaths
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
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