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Optical properties of carbon nanofiber photonic crystals
Rehammar, R,Magnusson, R,Fernandez-Dominguez, A I,Arwin, H,Kinaret, J M,Maier, S A,Campbell, E E B IOP Pub 2010 Nanotechnology Vol.21 No.46
<P>Carbon nanofibers (CNFs) are used as components of planar photonic crystals. Square and rectangular lattices and random patterns of vertically aligned CNFs were fabricated and their properties studied using ellipsometry. We show that detailed information such as symmetry directions and the band structure of these novel materials can be extracted from considerations of the polarization state in the specular beam. The refractive index of the individual nanofibers was found to be <I>n</I><SUB>CNF</SUB> = 4.1. </P>
Guthridge, Joel M.,Lu, R.,Sun, H.,Sun, C.,Wiley, Graham B.,Dominguez, N.,Macwana, Susan R.,Lessard, Christopher J.,Kim-Howard, X.,Cobb, Beth L.,Kaufman, Kenneth M.,Kelly, Jennifer A.,Langefeld, Carl D University of Chicago Press [etc.] 2014 American journal of human genetics Vol.94 No.4
Efforts to identify lupus-associated causal variants in the FAM167A/BLK locus on 8p21 are hampered by highly associated noncausal variants. In this report, we used a trans-population mapping and sequencing strategy to identify a common variant (rs922483) in the proximal BLK promoter and a tri-allelic variant (rs1382568) in the upstream alternative BLK promoter as putative causal variants for association with systemic lupus erythematosus. The risk allele (T) at rs922483 reduced proximal promoter activity and modulated alternative promoter usage. Allelic differences at rs1382568 resulted in altered promoter activity in B progenitor cell lines. Thus, our results demonstrated that both lupus-associated functional variants contribute to the autoimmune disease association by modulating transcription of BLK in B cells and thus potentially altering immune responses.
Attaching Thiolated Superconductor Grains on Gold Surfaces for Nanoelectronics Applications
De Los Santos Valladares, Luis,Bustamante Dominguez, Angel,Llandro, Justin,Suzuki, Seiichi,Mitrelias, Thanos,Bellido Quispe, Richard,Barnes, Crispin H. W.,Majima, Yutaka IOP Publishing 2010 Japanese journal of applied physics Vol.49 No.r9
Bragg reflection of terahertz waves in plasmonic crystals
Lee, Eui Su,Kang, D. H.,Fernandez-Dominguez, A. I.,Garcia-Vidal, F. J.,Martin-Moreno, L.,Kim, D. S.,Jeon, Tae-In The Optical Society 2009 Optics express Vol.17 No.11
<P>We present experimental and theoretical studies on terahertz surface plasmon (TSP) propagation on slit and rectangular aperture arrays in an aluminum sheet. Terahertz waves are coupled onto the plasmonic structures via a parallel plate waveguide. Long-lasting oscillations are observed in the temporal pulse shape after propagating through the periodic structure, whose Fourier transformation into the frequency domain results in Bragg-resonance spectral features. We show that the interference between the incident wave and the radiation reflected from both the aperture array and the waveguide block is responsible for this Bragg-resonance behavior. The reflection coefficient for a single slit is deduced to be 0.017 +/- 0.002.</P>
Alternative optical concept for electron cyclotron emission imaging.
Liu, J X,Milbourne, T,Bitter, M,Delgado-Aparicio, L,Dominguez, A,Efthimion, P C,Hill, K W,Kramer, G J,Kung, C,Kubota, S,Kasparek, W,Lu, J,Pablant, N A,Park, H,Tobias, B American Institute of Physics 2014 Review of scientific instruments Vol.85 No.11
<P>The implementation of advanced electron cyclotron emission imaging (ECEI) systems on tokamak experiments has revolutionized the diagnosis of magnetohydrodynamic (MHD) activities and improved our understanding of instabilities, which lead to disruptions. It is therefore desirable to have an ECEI system on the ITER tokamak. However, the large size of optical components in presently used ECEI systems have, up to now, precluded the implementation of an ECEI system on ITER. This paper describes a new optical ECEI concept that employs a single spherical mirror as the only optical component and exploits the astigmatism of such a mirror to produce an image with one-dimensional spatial resolution on the detector. Since this alternative approach would only require a thin slit as the viewing port to the plasma, it would make the implementation of an ECEI system on ITER feasible. The results obtained from proof-of-principle experiments with a 125 GHz microwave system are presented.</P>
Controlled electroplating and electromigration in nickel electrodes for nanogap formation
Los Santos Valladares, Luis De,Leon Felix, Lizbet,Bustamante Dominguez, Angel,Mitrelias, Thanos,Sfigakis, Francois,Khondaker, Saiful I,Barnes, Crispin H W,Majima, Yutaka IOP Pub 2010 Nanotechnology Vol.21 No.44
<P>We report the fabrication of nickel nanospaced electrodes by electroplating and electromigration for nanoelectronic devices. Using a conventional electrochemical cell, nanogaps can be obtained by controlling the plating time alone and after a careful optimization of electrodeposition parameters such as electrolyte bath, applied potential, cleaning, etc. During the process, the gap width decreases exponentially with time until the electrode gaps are completely bridged. Once the bridge is formed, the <I>ex situ</I> electromigration technique can reopen the nanogap. When the gap is ∼ 1 nm, tunneling current–voltage characterization shows asymmetry which can be corrected by an external magnetic field. This suggests that charge transfer in the nickel electrodes depends on the orientation of magnetic moments. </P>