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8 Oct 2007

Volume 91, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 91, 153101 (2007); http://dx.doi.org/10.1063/1.2793688 (3 pages)

B. J. Lee, K. Park, and Z. M. Zhang
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Electrical conductivity of a bulk metallic glass composite

K. Wang, T. Fujita, M. W. Chen, T. G. Nieh, H. Okada, K. Koyama, W. Zhang, and A. Inoue

Appl. Phys. Lett. 91, 154101 (2007); http://dx.doi.org/10.1063/1.2795800 (3 pages) | Cited 4 times

Online Publication Date: 9 October 2007

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The authors report the electrical conductivity of a bulk metallic glass (BMG) based composite fabricated by warm extrusion of a mixture of gas-atomized glassy powders and ductile α-brass powders. The conductivity of the BMG composite can be well modeled by the percolation theory and the critical percolation threshold volume of the high-conductive brass phase was estimated to be about 10%. It was found that the short irregular brass fibers can dramatically reduce the resistivity of the BMG, leading to an improved material with both high strength and good conductivity for functional applications.
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71.23.Cq Amorphous semiconductors, metallic glasses, glasses
72.80.Tm Composite materials
81.10.Fq Growth from melts; zone melting and refining
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation

Large finite-difference time domain simulations of a left-handed metamaterial lens with wires and resonators

R. S. Schechter and S. T. Chun

Appl. Phys. Lett. 91, 154102 (2007); http://dx.doi.org/10.1063/1.2798252 (3 pages) | Cited 3 times

Online Publication Date: 11 October 2007

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We present high-resolution computational results using large three-dimensional finite-difference time domain simulations of flat lenses made of left-handed metamaterial at microwave frequencies. These parallel computer simulations include all the details of the split-ring resonators, wires, and circuit boards that make up the metamaterial. The region of focusing is shown to be ∼ 0.5λ in radius and ∼ −24 dB down in power from the source level. The best focusing with the least aberration and the highest power density occurs at the frequency of peak transmission or best impedance match, as opposed to the frequency where the index of refraction n = −1.
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42.79.Bh Lenses, prisms and mirrors
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
42.15.Fr Aberrations

Analysis of photomixer receivers for continuous-wave terahertz radiation

I. S. Gregory, M. J. Evans, H. Page, S. Malik, I. Farrer, and H. E. Beere

Appl. Phys. Lett. 91, 154103 (2007); http://dx.doi.org/10.1063/1.2789709 (3 pages) | Cited 6 times

Online Publication Date: 11 October 2007

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We examine the electrical properties of photomixer receivers for the homodyne detection of continuous-wave terahertz radiation and analyze the coupling between the incoming terahertz field and the current flowing in the receiver circuit for two designs of photomixer. Significantly, we find that the optimum geometry for a photomixer receiver is very different to the optimized emitter designs despite the optical symmetry between the generation and detection processes.
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42.79.Sz Optical communication systems, multiplexers, and demultiplexers
42.15.Eq Optical system design
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation

Stretching single molecular DNA by temperature gradient

Hong-Ren Jiang and Masaki Sano

Appl. Phys. Lett. 91, 154104 (2007); http://dx.doi.org/10.1063/1.2775810 (3 pages) | Cited 9 times

Online Publication Date: 12 October 2007

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The authors present a method to control the conformation of DNA by using temperature gradient. The conformations of one end tethered and two ends tethered DNA are measured in different temperature gradients up to 3 K/μm. The results show that temperature gradient can exert force on a single DNA and create internal tension within it. The magnitude of the force is of the order of 0.1 pN and is enough to manipulate and stretch DNA. This way of manipulating DNA requires no beads and provides local control, while none of the other methods can satisfy these two requirements at the same time.
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82.37.Rs Single molecule manipulation of proteins and other biological molecules
87.15.H- Dynamics of biomolecules
87.14.G- Nucleic acids
87.80.-y Biophysical techniques (research methods)
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