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  • Applied Physics Letters
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  • 1
    Language: English
    In: Applied Physics Letters, 26 March 2012, Vol.100(13)
    Description: We observe the excitation and tuning of electromagnetically induced transparency (EIT) by the interference between different excitation pathways of the dark mode in a planar terahertz metamaterial. The EIT unit cell consists of a cut wire as the bright resonator and a pair of split ring resonators (SRRs) as the dark element. The dark mode resonance is excited by both the electric and magnetic fields when the SRR pair translates along the wire without altering the lateral distance between the resonators. The electric and magnetic pathways of exciting the dark mode allows for a giant amplitude modulation of the EIT resonance.
    Keywords: Photonics And Optoelectronics
    ISSN: 0003-6951
    E-ISSN: 1077-3118
    Source: © 2012 American Institute of Physics (AIP)〈img src=http://exlibris-pub.s3.amazonaws.com/AIP_edited.gif style="vertical-align:middle;margin-left:7px"〉
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  • 2
    Language: English
    In: Applied Physics Letters, 18 July 2016, Vol.109(3)
    Description: We report the electronic and optical properties of Sn 2 S 3 as obtained from first principles calculations with the modified Becke-Johnson potential. The electronic structure shows that Sn occurs in both divalent and tetravalent forms. The fundamental band gap of 0.82 eV is indirect. The direct gap is 0.97 eV, but the onset of strong optical absorption is much higher at ∼1.75 eV. This is as a consequence of the Sn 2+ s and Sn 4+ s characters of the valence and conduction band extrema, respectively. We also find strong and different anisotropies for conduction in p - and n -type Sn 2 S 3 . This should be taken into account in device structures in order to obtain efficient charge collection. The thermopowers are reasonably high for both p - and n -type materials. p -type Sn 2 S 3 shows complex corrugated isosurface sections, while the n -type material shows multiple band extrema.
    Keywords: Semiconductors
    ISSN: 0003-6951
    E-ISSN: 1077-3118
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  • 3
    Language: English
    In: Applied Physics Letters, 09 April 2012, Vol.100(15)
    Description: Electroabsorption (E-A) and electrophotoluminescence (E-PL) responses of polymer films of CdSe quantum dots (QDs) incorporated sulfide-substituted poly(1,4-phenylene vinylene) derivative CdSe-S3PPV were measured. The observed Stark shift both in E-A and E-PL responses is likely to be caused by a substantial contribution of change in molecular polarizability ( Δ α ¯ ) and change in electric dipole moment ( | Δ μ | ) following photoexcitation. Together with Stark shift, field-induced photoluminescence (PL) quenching and enhancement were observed depending on excitation energy. The quenching of PL of CdSe-S3PPV film is interpreted in terms of an exciton model-a breaking of electron-hole pairs in the presence of electric field.
    Keywords: Structural, Mechanical, Optical, And Thermodynamic Properties Of Advanced Materials
    ISSN: 0003-6951
    E-ISSN: 1077-3118
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  • 4
    Language: English
    In: Applied Physics Letters, 17 June 2013, Vol.102(24)
    Description: Silver nanocolumns were grown on Si substrate using glancing angle deposition method. Interestingly, the cold nanocolumnar surface was observed to make a delay of more than 62 s in freezing compared to the conventional silver thin film. The observed delay in freezing on silver nanocolumns is explainable in terms of reduction in effective liquid-solid interface area within the framework of Cassie-Baxter model. This study shows the possibility of using silver nanocolumnar films in ice free coatings and surfaces with tunable freezing properties.
    Keywords: Nanoscale Science And Technology
    ISSN: 0003-6951
    E-ISSN: 1077-3118
    Source: © 2013 AIP Publishing LLC (AIP)〈img src=http://exlibris-pub.s3.amazonaws.com/AIP_edited.gif style="vertical-align:middle;margin-left:7px"〉
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  • 5
    Language: English
    In: Applied Physics Letters, 06/17/2013, Vol.102(24), p.243112
    ISSN: 0003-6951
    E-ISSN: 1077-3118
    Source: CrossRef
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  • 6
    Language: English
    In: Applied Physics Letters, 10 July 2017, Vol.111(2)
    Description: Herein, we report the magneto-transport and exchange bias effect in a “314-type” oxygen vacancy ordered material with composition SrCo 0.85 Fe 0.15 O 2.62 . This material exhibits a ferrimagnetic transition above room temperature, at 315 K. The negative magnetoresistance starts to appear from room temperature (−1.3% at 295 K in 70 kOe) and reaches a sizable value of 58% at 4 K in 70 kOe. A large exchange bias effect is observed below 315 K when the sample is cooled in the presence of a magnetic field. The coexistence of nearly compensated and ferrimagnetic regions in the layered structure leads to a magnetoresistance and an exchange bias in this sample. The appearance of a sizable magnetoresistance and a giant exchange bias effect, especially near room temperature, indicates that “314-type” cobaltates are a promising class of material systems for the exploration of materials with potential applications as magnetic sensors or in the area of spintronics.
    Keywords: Magnetics And Spintronics
    ISSN: 0003-6951
    E-ISSN: 1077-3118
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  • 7
    Language: English
    In: Applied Physics Letters, 13 January 2014, Vol.104(2)
    Description: We report a facile method to fabricate highly sensitive superhydrophobic Ag nanorods (AgNR) arrays based surface enhanced fluorescence spectroscopy (SEFS) substrates using glancing angle deposition technique at a substrate temperature of 133 K and then subsequent coating of heptadecafluoro-1-decanethiol (HDFT) molecules. The SEFS enhancement behaviour of these substrates was determined by using aqueous solution of Rhodamine 6G. The HDFT coated superhydrophobic AgNR arrays SEFS substrates exhibit more then 3-fold fluorescence signal enhancement than conventional AgNR films. These HDFT coated superhydrophobic AgNR SEFS substrates based sensors may find application for the purpose of trace analysis and biosensing.
    Keywords: Nanoscale Science And Technology
    ISSN: 0003-6951
    E-ISSN: 1077-3118
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  • 8
    Language: English
    In: Applied Physics Letters, 21 March 2011, Vol.98(12)
    Description: Cholesterol oxidase (ChOx) physisorbed onto NiO nanoparticles (nNiO, 22 nm)— chitosan (CHIT) film prepared using coprecipitation method has been characterized using x-ray diffraction, Fourier transform infrared, scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy techniques. The results of electrochemical response studies conducted on ChOx/nan-NiO-CHIT/ITO bioelectrode show linearity of 10–400 mg/dl, detection limit of 43.4 mg/dl, sensitivity of 0.808   μ A / ( mg   dl   cm 2 ) , fast response time of 15 s, and shelf-life of about 10 weeks. The low value of Michaelis–Menten constant ( K m ) obtained as 0.67 mM indicates high affinity of ChOx toward the substrate.
    Keywords: Biophysics And Bio-Inspired Systems
    ISSN: 0003-6951
    E-ISSN: 1077-3118
    Source: © 2011 American Institute of Physics (AIP)〈img src=http://exlibris-pub.s3.amazonaws.com/AIP_edited.gif style="vertical-align:middle;margin-left:7px"〉
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  • 9
    Language: English
    In: Applied Physics Letters, 04 January 2016, Vol.108(1)
    Description: In the present work, shifting of Fermi level of MoS 2 nanosheets due to decoration of Au nanoparticles (Au NPs) is reported. Au NPs are grown on MoS 2 nanosheets by chemical reduction method. The structural analysis of pristine MoS 2 and Au NPs decorated MoS 2 has been done using X-ray diffraction and transmission electron microscopy. The effect of Au NPs decoration on the Fermi energy level of MoS 2 nanosheets have been monitored by scanning Kelvin probe microscopy, which measures the work function in terms of contact potential difference. The work function of pristine MoS 2 is found to be 4.994 eV, and it increases linearly for Au-MoS 2 with increasing concentration of Au NPs. The gradual increase in the work function values indicate a systematic shifting of Fermi energy level of MoS 2 towards valence band due to decoration of Au NPs.
    Keywords: Nanoscale Science And Technology
    ISSN: 0003-6951
    E-ISSN: 1077-3118
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  • 10
    Language: English
    In: Applied Physics Letters, 04 September 2017, Vol.111(10)
    Description: A simple optimizing approach that improves the electrical properties of poly (3,4-ethylenedioxylthiophene):poly(styrenesulfonate) (PEDOT:PSS) films and their application in heterojunction diodes and polymer photovoltaic cells is presented in this paper. The optimizing process is performed by mixing the organic solvents n-methyl-2-pyrrolidone and methanol along with dimethyl sulfoxide into PEDOT:PSS solution achieving the facile combination of the solvent effect. Electrical conductivity varies from 0.16 to 194 S/cm by variation in the concentration of n-methyl-2-pyrrolidone. It is shown that the enhancement in conductivity of PEDOT:PSS films with co-solvents by three orders of magnitude is achieved compared to pristine PEDOT:PSS with transparency 〉92% in the visible region. The heterojunction diodes fabricated with co-solvents studied in this work showed rectifying behavior, and polymer photovoltaic cells fabricated with the co-solvents exhibited photovoltaic performance.
    Keywords: Semiconductors
    ISSN: 0003-6951
    E-ISSN: 1077-3118
    Source: © 2017 Author(s) (AIP)
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