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24 Oct 2005

Volume 87, Issue 17, Articles (17xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 87, 172506 (2005); http://dx.doi.org/10.1063/1.2120911 (3 pages)

T. Kimura, Y. Otani, and J. Hamrle
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Confirmation of information transfer using lattice images

Tetsuya Akashi, Akira Sugawara, Hiroto Kasai, Takaho Yoshida, Tsuyoshi Matsuda, Yoshihiko Togawa, Ken Harada, and Akira Tonomura

Appl. Phys. Lett. 87, 174101 (2005); http://dx.doi.org/10.1063/1.2115067 (3 pages) | Cited 1 time

Online Publication Date: 17 October 2005

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A method of confirming information transfer in spatial frequency regions higher than 10 nm−1 by the objective lens of an electron microscope is introduced. Two electron-diffraction waves, 000 and hkl, from a crystalline specimen are selected by an objective aperture inserted asymmetrically on the back-focal plane, and a lattice image is observed at appropriate defocus values to prove that information corresponding to the spatial frequency of hkl diffraction has been transferred. We confirmed that information for 15.6 nm−1 (0.064-nm-spacing fringes in real space) and less could be transferred in a 1-million-volt field emission electron microscope.
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07.78.+s Electron, positron, and ion microscopes; electron diffractometers
41.85.Ne Electrostatic lenses, septa
42.30.Lr Modulation and optical transfer functions

Guided modes in a planar anisotropic biaxial slab with partially negative permittivity and permeability

Qiang Cheng and Tie Jun Cui

Appl. Phys. Lett. 87, 174102 (2005); http://dx.doi.org/10.1063/1.2112194 (3 pages) | Cited 9 times

Online Publication Date: 18 October 2005

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We have investigated the guidance conditions for both bulk and surface modes in a anisotropic biaxial slab whose permittivity and permeability tensors can be partially negative under the excitation of a two-dimensional line source. We have shown that such guidance conditions will vary greatly with the change of the tensor components. We also show that infinite bulk modes are excited under some specific conditions in the anisotropic slab, unlike the case in the traditional dielectric waveguide. An efficient graphical method has been proposed to determine the propagation constants of the guided modes in the anisotropic slab.
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42.70.-a Optical materials
42.79.Gn Optical waveguides and couplers

Experimental characterization of the separation between wavelength-multiplexed quantum and classical communication channels

N. I. Nweke, P. Toliver, R. J. Runser, S. R. McNown, J. B. Khurgin, T. E. Chapuran, M. S. Goodman, R. J. Hughes, C. G. Peterson, K. McCabe, J. E. Nordholt, K. Tyagi, P. Hiskett, and N. Dallmann

Appl. Phys. Lett. 87, 174103 (2005); http://dx.doi.org/10.1063/1.2117616 (3 pages) | Cited 4 times

Online Publication Date: 21 October 2005

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Quantum key distribution (QKD) is a new technique for secure key distribution based on the laws of physics rather than mathematical or algorithmic computational complexity used by current systems. Understanding the compatibility of QKD at 1310 nm with the existing commercial optical networks bearing classical wavelength-division-multiplexed (WDM) channels at 1550 nm is important to advance the deployment of QKD systems in such networks. The minimum wavelength separation for multiplexing QKD and WDM channels on a shared fiber is experimentally determined for impairment-free QKD+WDM transmission.
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42.79.Sz Optical communication systems, multiplexers, and demultiplexers
03.67.Hk Quantum communication
42.81.Uv Fiber networks
03.67.Dd Quantum cryptography and communication security
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