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9 Feb 2004

Volume 84, Issue 6, pp. 837-1024

Issue Cover Spotlight Figure

Appl. Phys. Lett. 84, 975 (2004); http://dx.doi.org/10.1063/1.1646453 (3 pages)

Xiang Yang Kong and Zhong Lin Wang
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Thickness and low-temperature conductivity of DNA molecules

A. Yu. Kasumov, D. V. Klinov, P.-E. Roche, S. Guéron, and H. Bouchiat

Appl. Phys. Lett. 84, 1007 (2004); http://dx.doi.org/10.1063/1.1644909 (3 pages) | Cited 35 times

Online Publication Date: 4 February 2004

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We argue that interaction between molecules and substrate is a key parameter which determines the conducting or insulating behavior of DNA molecules. In this letter, we show that strongly deformed DNA molecules deposited on a substrate, whose thickness is less than half the native thickness of the molecule, are insulating, whereas molecules keeping their native thickness are conducting down to very low temperature with a non-ohmic behavior characteristic of a 1D conductor with repulsive electron–electron interactions. © 2004 American Institute of Physics.
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87.14.G- Nucleic acids
87.64.Dz Scanning tunneling and atomic force microscopy
68.37.Ps Atomic force microscopy (AFM)
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
72.80.Le Polymers; organic compounds (including organic semiconductors)

Digital holographic method for tomography-image reconstruction

Cheng Liu, Changchun Yan, and Shumei Gao

Appl. Phys. Lett. 84, 1010 (2004); http://dx.doi.org/10.1063/1.1646224 (3 pages)

Online Publication Date: 4 February 2004

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A digital holographic method for three-dimensional reconstruction of tomography images is demonstrated theoretically and experimentally. In this proposed method, a numerical hologram is first computed by calculating the total diffraction field of all transect images of a detected organ. Then, the numerical hologram is transferred to the usual recording medium to generate a physical hologram. Last, all the transect images are reconstructed in their original position by illuminating the physical hologram with a laser, thereby forming a three-dimensional transparent image of the organ detected. Due to its true third dimension, the reconstructed image using this method is much more vivid and accurate than that of other methods. Potentially, it may have great prospects for application in medical engineering. © 2004 American Institute of Physics.
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81.70.Tx Computed tomography
42.30.Wb Image reconstruction; tomography
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