PubMed Journals Articles About "Direct Transfer Patterning Electrically Small Antennas Onto Three" RSS

17:16 EST 28th January 2015 | BioPortfolio

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Showing "Direct Transfer Patterning Electrically Small Antennas onto Three" PubMed Articles 1–25 of 18,000+

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Switching individual quantum dot emission through electrically controlling resonant energy transfer to graphene.

Electrically controlling resonant energy transfer of optical emitters provides a novel mechanism to switch nanoscale light sources on and off individually for optoelectronic applications. Graphene's optical transitions are tunable through electrostatic gating over a broad wavelength spectrum, making it possible to modulate energy transfer from a variety of nano-emitters to graphene at room temperature. We demonstrate photoluminescence switching of individual colloidal quantum dots by electrically tuning the...

Developmental patterning by gradients of mobile small RNAs.

Development of multicellular organisms depends on intercellular communication via mobile signals that provide positional information to coordinate cell fate decisions. In addition to peptide ligands, transcription factors, and hormones, plants use small RNAs as positional instructive signals. The unique patterning properties of small RNA gradients resulting from regulated mobility suggest conceptual similarities to the function of animal morphogens, and provide robustness and precision to the formation of c...

Laser direct synthesis of silicon nanowire field effect transistors.

We demonstrate a single-step, laser-based technique to fabricate silicon nanowire field effect transistors. Boron-doped silicon nanowires are synthesized using a laser-direct-write chemical vapor deposition process, which can produce nanowires as small as 60 nm, far below the diffraction limit of the laser wavelength of 395 nm. In addition, the method has the advantages of in situ doping, catalyst-free growth, and precise control of nanowire position, orientation, and length. Silicon nanowires are directly ...

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Carbon cloth stimulates direct interspecies electron transfer in syntrophic co-cultures.

This study investigated the possibility that the electrical conductivity of carbon cloth accelerates direct interspecies electron transfer (DIET) in co-cultures. Carbon cloth accelerated metabolism of DIET co-cultures (Geobacter metallireducens-Geobacter sulfurreducens and G.metallireducens-Methanosarcina barkeri) but did not promote metabolism of co-cultures performing interspecies H2 transfer (Desulfovibrio vulgaris-G.sulfurreducens). On the other hand, DIET co-cultures were not stimulated by poorly condu...

High-speed scanning thermal lithography for nanostructuring of electronic devices.

We report a detailed analysis on the use of simultaneous substrate heating in conjunction with scanning thermal lithography (SThL) to dramatically increase the patterning speed of conventional SThL systems. The investigation consists of finite element simulations as well as practical assessments of the speed at which different organic precursors are thermally converted to produce standalone electrically active and passive nanostructures. As a proof of concept the high-speed SThL method was used to pattern s...

Patterning Magnetic Regions in Hydrogenated Graphene Via E-Beam Irradiation.

Partially hydrogenated graphene is ferromagnetic and may be patterned by electron-beam irradiation. Sequential patterning produces a patterned magnetic array. Removal of the hydrogen atoms also can convert electrically insulating fully hydrogenated graphene back into conductive graphene, enabling the writing of chemically isolated, dehydrogenated graphene nanoribbons as narrow as 100 nm.

Ultrafast infrared spectroscopy in photosynthesis.

In recent years visible pump/mid-IR probe spectroscopy has established itself as a key technology to unravel structure-function relationships underlying the photo-dynamics of complex molecular systems. In this contribution we review the most important applications of mid-infrared absorption difference spectroscopy with sub-picosecond time-resolution to photosynthetic complexes. Considering several examples, such as energy transfer in photosynthetic antennas and electron transfer in reaction centers and even...

Novel Wideband MIMO Antennas That Can Cover the Whole LTE Spectrum in Handsets and Portable Computers.

A dual resonant antenna configuration is developed for multistandard multifunction mobile handsets and portable computers. Only two wideband resonant antennas can cover most of the LTE spectrums in portable communication equipment. The bandwidth that can be covered by each antenna exceeds 70% without using any matching or tuning circuits, with efficiencies that reach 80%. Thus, a dual configuration of them is capable of covering up to 39 LTE (4G) bands besides the existing 2G and 3G bands. 2 × 2 MIMO confi...

Precisely Patterning Graphene Sheets through a Liquid-Bridge Induced Strategy.

A liquid-bridge induced precisely positioning strategy for graphene patterning is reported. Owing to well-defined assembly of graphene, a flexible bending-sensitive circuit is generated, allowing electrons to stop/pass this graphene-based circuit depending on mechanical pressing/relaxing. The present approach may advance existing applications of patterning graphene in the optical/electronic industry.

Heat transfer enhancement accompanying Leidenfrost state suppression at ultrahigh temperatures.

The well-known Leidenfrost effect is the formation of a vapor layer between a liquid and an underlying hot surface. This insulating vapor layer severely degrades heat transfer and results in surface dryout. We measure the heat transfer enhancement and dryout prevention benefits accompanying electrostatic suppression of the Leidenfrost state. Interfacial electric fields in the vapor layer can attract liquid towards the surface and promote wetting. This principle can suppress dryout even at ultrahigh temperat...

Thermally conductive, electrically insulating and melt-processable polystyrene/boron nitride nanocomposites prepared by in situ reversible addition fragmentation chain transfer polymerization.

Thermally conductive and electrically insulating polymer/boron nitride (BN) nanocomposites are highly attractive for various applications in many thermal management fields. However, so far most of the preparation methods for polymer/BN nanocomposites have usually caused difficulties in the material post processing. Here, an in situ grafting approach is designed to fabricate thermally conductive, electrically insulating and post-melt processable polystyrene (PS)/BN nanosphere (BNNS) nanocomposites by initiat...

Antenna-integrated 0.6 THz FET direct detectors based on CVD graphene.

We present terahertz (THz) detectors based on top-gated graphene field effect transistors (GFETs) with integrated split-bow-tie antennas. The GFETs were fabricated using graphene grown by chemical vapor deposition (CVD). The THz detectors are capable of room-temperature rectification of a 0.6 THz signal and achieve a maximum optical responsivity better than 14 V/W and minimum optical noise-equivalent power (NEP) of 515 pW/Hz^0.5. Our results are a significant improvement over previous work on graphene direc...

A General Design Strategy for Block Copolymer Directed Self-Assembly Patterning of Integrated Circuits Contact Holes using an Alphabet Approach.

Directed Self-Assembly (DSA) is a promising lithography candidate for technology nodes beyond 14 nm. Researchers have shown contact hole patterning for random logic circuits using DSA with small physical templates. This paper introduces an alphabet approach that uses a minimal set of small physical templates to pattern all contacts configurations on integrated circuits. We illustrate, through experiments, a general and scalable template design strategy that links the DSA material properties to the technolog...

Electrically tunable metasurface perfect absorbers for ultra-thin mid-infrared optical modulators.

Dynamically reconfigurable metasurfaces open up unprecedented opportunities in applications such as high capacity communications, dynamic beam shaping, hyperspectral imaging and adaptive optics. The realization of high performance metasurface-based devices remains a great challenge due to very limited tuning ranges and modulation depths. Here we show that a widely tunable metasurface composed of optical antennas on graphene can be incorporated into a subwavelength-thick optical cavity to create an electrica...

Programmable Patterning of Protein Bioactivity by Visible Light.

The simple and quick patterning of functional proteins on engineered surfaces affords an opportunity to fabricate protein microarrays in lab-on-chip systems. We report on the programmable patterning of proteins as well as the local activation of enzymes by visible light. We successfully generated functional protein patterns with different geometries in situ and demonstrated the specific patterning of multiple kinds of proteins side-by-side without the need for specific linker molecules or elaborate surface ...

Anatomy of the direct small branches of the proper digital nerve of the fingers: A cadaveric study.

The purpose of this study was to evaluate the anatomical constancy of the direct small branches of the proper digital nerve.

Room Temperature Electrically Injected Polariton Laser.

Room temperature electrically pumped inversionless polariton lasing is observed from a bulk GaN-based microcavity diode. The low nonlinear threshold for polariton lasing occurs at 169  A/cm^{2} in the light-current characteristics, accompanied by a collapse of the emission linewidth and small blueshift of the emission peak. Measurement of angle-resolved luminescence, polariton condensation and occupation in momentum space, and output spatial coherence and polarization have also been made. A second thres...

Direct Laser Writing of Photostable Fluorescent Silver Nanoclusters in Polymer Films.

Metal nanoclusters consist of a few to few hundreds of atoms, and exhibit attractive molecular properties such as ultrasmall size, discrete energy levels and strong fluorescence. Although patterning of these clusters down to the micro- or nanoscale could lead to applications such as high-density data storage, it has been reported only for inorganic matrices. Here we present submicron-scale mask-free patterning of fluorescent silver nanoclusters in an organic matrix. The nanoclusters were produced by direct ...

A Monolithic Electrically Injected Nanowire Array Edge-Emitting Laser on (001) Silicon.

A silicon-based laser, preferably electrically pumped, has long been a scientific and engineering goal. We demonstrate here, for the first time, an edge-emitting InGaN/GaN disk-in-nanowire array electrically pumped laser emitting in the green (λ=533nm) on (001)silicon substrate. The devices display excellent dc and dynamic characteristics with values of threshold current density, differential gain, T0 and small signal modulation bandwidth equal to 1.76kA/cm2, 3x10-17cm2, 232K and 5.8GHz respectively under ...

Phase change material based tunable reflectarray for free-space optical inter/intra chip interconnects.

The concept of phase change material (PCM) based optical antennas and antenna arrays is proposed for dynamic beam shaping and steering utilized in free-space optical inter/intra chip interconnects. The essence of this concept lies in the fact that the behaviour of PCM based optical antennas will change due to the different optical properties of the amorphous and crystalline state of the PCM. By engineering optical antennas or antenna arrays, it is feasible to design dynamic optical links in a desired manner...

Surface Microfluidic Patterning and Transporting Organic Small Molecules.

A microfluidic method is developed to pattern organic small molecules directly in air. When heated to above its melting point, a powder melts into liquid drops which propagate along the pattern area. The method can further be applied to transport other dye molecules, to create multicolored patterns in one step. The fluorescence microscopy image shows rhodamine B (red), fluorescein (green), and calcein blue (blue) doped N-ethyl-d-glucamine on 100-μm Au lines.

Controlling graphene plasmons with resonant metal antennas and spatial conductivity patterns.

Graphene plasmons promise unique possibilities for controlling light in nanoscale devices and for merging optics with electronics. Here,we introduce a versatile platform technology based on resonant optical antennas and conductivity patterns for launching and controlling of propagating graphene plasmons, constituting an essential step for the development of graphene plasmonic circuits. We demonstrate the launching and focusing of infrared graphene plasmons with geometrically tailored antennas, and how they ...

Measurement of natural convective heat transfer coefficient along the surface of a heated wire using digital holographic interferometry.

In this paper, the local convective heat transfer coefficient (h) is measured along the surface of an electrically heated vertical wire using digital holographic interferometry (DHI). Experiments are conducted on wires of different diameters. The experimentally measured values are within the range as given in the literature. DHI is expected to provide a more accurate local convective heat transfer coefficient (h) as the value of the temperature gradient required for the calculation of "h" can be obtained mo...

Detection of stealthy small amphiphilic biomarkers.

Pathogen-specific biomarkers are secreted in the host during infection. Many important biomarkers are not proteins, but rather small molecules that cannot be directly detected by conventional methods. However, these small molecule biomarkers, such as phenolic glycolipid-I (PGL-I) of Mycobacterium leprae and Mycobactin T (MbT) of Mycobacterium tuberculosis, are critical to the pathophysiology of infection, and may be important in the development of diagnostics, vaccines and novel therapeutic strategies. Meth...

Microbial nanowires for bioenergy applications.

Microbial nanowires are electrically conductive filaments that facilitate long-range extracellular electron transfer. The model for electron transport along Shewanella oneidensis nanowires is electron hopping/tunneling between cytochromes adorning the filaments. Geobacter sulfurreducens nanowires are comprised of pili that have metal-like conductivity attributed to overlapping pi-pi orbitals of aromatic amino acids. The nanowires of Geobacter species have been implicated in direct interspecies electron tran...


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