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18 Feb 2013

Volume 102, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 102, 073101 (2013); http://dx.doi.org/10.1063/1.4790646 (4 pages)

V. Reboud, J. Romero-Vivas, P. Lovera, N. Kehagias, T. Kehoe, G. Redmond, and C. M. Sotomayor Torres
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Molecular beam epitaxial growth and optical properties of red-emitting (λ = 650 nm) InGaN/GaN disks-in-nanowires on silicon

S. Jahangir, M. Mandl, M. Strassburg, and P. Bhattacharya

Appl. Phys. Lett. 102, 071101 (2013); http://dx.doi.org/10.1063/1.4793300 (5 pages)

Online Publication Date: 20 February 2013

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We have investigated the radiative properties of InGaN disks in GaN nanowires grown by plasma enhanced molecular beam epitaxy on (001) silicon substrates. The growth of the nanowire heterostructures has been optimized to maximize the radiative efficiency, or internal quantum efficiency (IQE), for photoluminescence emission at λ = 650 nm. It is found that the IQE increases significantly (by ∼10%) to 52%, when post-growth passivation of nanowire surface with silicon nitride or parylene is applied. The increase in efficiency is supported by radiative- and nonradiative lifetimes derived from data obtained from temperature dependent- and time-resolved photoluminescence measurements. Light emitting diodes with p-i-n disk-in-nanowire heterostructures passivated with parylene have been fabricated and characterized.
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81.05.Ea III-V semiconductors
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
85.60.Jb Light-emitting devices
78.67.Uh Nanowires
81.07.Gf Nanowires
78.55.Cr III-V semiconductors

Numerical simulations of time-domain interferometric soft X-ray microscope with broadband high-order harmonic light sources

Reika Kanya, Atsushi Iwasaki, Takahiro Teramoto, and Kaoru Yamanouchi

Appl. Phys. Lett. 102, 071102 (2013); http://dx.doi.org/10.1063/1.4793301 (3 pages)

Online Publication Date: 20 February 2013

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A scheme for achieving high spatial resolution in soft X-ray microscopy with coherent broadband light sources is proposed, in which the chromatic aberration at a Fresnel zone plate lens can be canceled out by introducing time-delayed double pulses as an input light and by the Fourier transformation of recorded images with respect to the time delay. Numerical simulations of microscope images show that the spatial resolution of the proposed method is determined only by specifications of zone plates even when a broadband soft X-ray is used as a light source.
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07.85.Tt X-ray microscopes
42.79.Bh Lenses, prisms and mirrors
42.79.Ci Filters, zone plates, and polarizers
02.60.-x Numerical approximation and analysis

Light-driven three-dimensional rotational motion of dandelion-shaped microparticles

Hagay Shpaisman, David B. Ruffner, and David G. Grier

Appl. Phys. Lett. 102, 071103 (2013); http://dx.doi.org/10.1063/1.4793401 (4 pages)

Online Publication Date: 20 February 2013

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Chemically synthesized colloidal particles featuring large-scale surface asperities can be trapped and manipulated in fluid media through holographic optical trapping. Light scattering by these particles' surface features provides a mechanism for holographic optical traps also to exert torques on them, thereby setting them in steady rotation about arbitrary axes in three dimensions. When pairs of rotating particles are brought close enough that their surface features mesh, they form microscopic gear trains. These micro-opto-mechanical systems can be arranged in any desired three-dimensional configuration.
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42.50.Wk Mechanical effects of light on material media, microstructures and particles
42.40.My Applications

Improved Kerr constant and response time of polymer-stabilized blue phase liquid crystal with a reactive diluent

Ji-Liang Zhu, Shui-Bin Ni, Yue Song, En-Wei Zhong, Yi-Jun Wang, Chao Ping Chen, Zhicheng Ye, Gufeng He, Dong-Qing Wu, Xiao-Long Song, Jian-Gang Lu, and Yikai Su

Appl. Phys. Lett. 102, 071104 (2013); http://dx.doi.org/10.1063/1.4793416 (4 pages)

Online Publication Date: 20 February 2013

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A polymer-stabilized (PS) blue phase liquid crystal (BPLC) with fast response time and large Kerr constant is investigated by doping a low molecular weight monomer (N-vinylpyrrollidone) into a conventional PS-BPLC consisting of BPLC, RM257, and 1,1,1-trimethylolpropane triacrylate. With this polymer network system, Kerr constant and the response can be improved simultaneously. Compared to the conventional PS-BPLC, Kerr constant of the proposed PS-BPLC can increase by 54% and the response time can decrease by 23% at the same time. The contrast ratio can be kept at a high level, over 1000:1 at λ = 633 nm.
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61.30.Vx Polymer liquid crystals
78.20.Jq Electro-optical effects
61.72.up Other materials

Active subnanometer spectral control of a random laser

Marco Leonetti and Cefe López

Appl. Phys. Lett. 102, 071105 (2013); http://dx.doi.org/10.1063/1.4792759 (4 pages) | Cited 1 time

Online Publication Date: 20 February 2013

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We demonstrate an experimental technique that allows to achieve a robust control on the emission spectrum of a micro random laser and to select individual modes with sub-nanometer resolution. The presented approach relies on an optimization protocol of the spatial profile of the pump beam. Here we demonstrate not only the possibility to increase the emission at a wavelength but also that we can “isolate” an individual peak suppressing unwanted contributions form other modes.
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42.55.Mv Dye lasers
42.60.By Design of specific laser systems
42.60.Fc Modulation, tuning, and mode locking
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation

Wavelength selective p-GaN/ZnO colloidal nanoparticle heterojunction photodiode

Liqiao Qin, Dali Shao, Christopher Shing, and Shayla Sawyer

Appl. Phys. Lett. 102, 071106 (2013); http://dx.doi.org/10.1063/1.4793210 (4 pages)

Online Publication Date: 20 February 2013

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An ultraviolet heterojunction photodiode consisting of epitaxially grown p-GaN layers and polyvinyl alcohol coated ZnO colloidal nanoparticles exhibits a lowpass and bandpass alternative property depending on the illumination direction. At 0 V bias, a time response on the order of 10 s of milliseconds was demonstrated with a responsivity on the order of mA/W with about 100 nW of ultraviolet illumination. The rectification ratio at ±5 V was 1000 under dark environment. Deposition of colloidal ZnO nanoparticles on an independent p-GaN substrate introduces a technique to create a heterostructure pn junction photodiode with wavelength selection by back illumination.
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85.60.Dw Photodiodes; phototransistors; photoresistors
85.30.Kk Junction diodes

Photoresponses of manganese-doped gallium nitride grown by metalorganic vapor-phase epitaxy

Jinn-Kong Sheu, Feng-Wen Huang, Yu-Hsuan Liu, P. C. Chen, Yu-Hsiang Yeh, Ming-Lun Lee, and Wei-Chih Lai

Appl. Phys. Lett. 102, 071107 (2013); http://dx.doi.org/10.1063/1.4793432 (3 pages)

Online Publication Date: 21 February 2013

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The photoresponses of gallium nitride (GaN) doped with manganese (Mn) grown by metalorganic vapor-phase epitaxy were investigated. The transmission spectroscopy obtained from the Mn-doped GaN exhibited three distinct absorption thresholds at approximately 365, 650, and 830 nm, respectively. The below-band-gap absorption peaks were attributed to the fact that the deep Mn-related states mediate the electronic transition between the valence and conduction bands. A below-band-gap spectral response ranging from 400 nm to 1000 nm was also observed from a typical GaN p-i-n photodetector with Mn-doped absorption layer. The significant below-band-gap spectral responses showed that the Mn-doped GaN-based materials have promising applications in intermediate band solar cells.
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85.60.Gz Photodetectors (including infrared and CCD detectors)
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)
81.15.Kk Vapor phase epitaxy; growth from vapor phase
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