JAP: Lasers, Optics, and Optoelectronics http://scitation.aip.org/ JAP: Lasers, Optics, and Optoelectronics Theoretical description of thermal lens spectrometry in micro space http://link.aip.org/link/?JAP/111/033109/1&agg=rss Mingqiang Liu, Dorota Korte, and Mladen Franko<br/> For thermal lens spectrometry in micro space, temperature distributions in the sample under continuous-wave modulated excitations of either laser or incoherent light source (ILS) are for the first time deduced with respective considerations of different experimental parameters, such as flow of the s ... [J. Appl. Phys. 111, 033109 (2012)] published Mon Feb 13, 2012. InGaN/GaN multiple-quantum-well light-emitting diodes grown on Si(111) substrates with ZrB(0001) buffer layers http://link.aip.org/link/?JAP/111/033107/1&agg=rss Adam H. Blake, Derek Caselli, Christopher Durot, Jason Mueller, Eduardo Parra et al.<br/> Multiple-quantum-well light-emitting diode (LED) structures of InGaN/GaN were grown by metalorganic chemical vapor deposition on Si(111) substrates via ZrB(0001) buffer layers and a GaN template comprising composite AlGaN (where x lies in the range from 0 to 1) transition layers to minimize cracking ... [J. Appl. Phys. 111, 033107 (2012)] published Mon Feb 13, 2012. Extraction of optical Bloch modes in a photonic-crystal waveguide http://link.aip.org/link/?JAP/111/033108/1&agg=rss S. R. Huisman, G. Ctistis, S. Stobbe, J. L. Herek, P. Lodahl et al.<br/> We perform phase-sensitive near-field scanning optical microscopy on photonic-crystal waveguides. The observed intricate field patterns are analyzed by spatial Fourier transformations, revealing several guided transverse electric (TE) and transverse magnetic (TM) like modes. Using the reconstruction ... [J. Appl. Phys. 111, 033108 (2012)] published Mon Feb 13, 2012. Lowering the excitation threshold of a random laser using the dynamic scattering states of an organosiloxane smectic A liquid crystal http://link.aip.org/link/?JAP/111/033106/1&agg=rss Stephen M. Morris, Damian J. Gardiner, Malik M. Qasim, Philip J. W. Hands, Timothy D. Wilkinson et al.<br/> Smectic A liquid crystals, based upon molecular structures that consist of combined siloxane and mesogenic moieties, exhibit strong multiple scattering of light with and without the presence of an electric field. This paper demonstrates that when one adds a laser dye to these compounds it is possibl ... [J. Appl. Phys. 111, 033106 (2012)] published Fri Feb 10, 2012. Remote lasing in air by recombination and electron impact excitation of molecular nitrogen http://link.aip.org/link/?JAP/111/033105/1&agg=rss Joseph Penano, Phillip Sprangle, Bahman Hafizi, Daniel Gordon, Richard Fernsler et al.<br/> We analyze and simulate the physical mechanisms for a remote atmospheric lasing configuration which utilizes a combination of an ultrashort pulse laser to form a plasma filament of seed electrons, and a heater beam to heat the seed electrons. Nitrogen molecules are excited by electron impact and rec ... [J. Appl. Phys. 111, 033105 (2012)] published Wed Feb 8, 2012. ZnO/Si arrays decorated by Au nanoparticles for surface-enhanced Raman scattering study http://link.aip.org/link/?JAP/111/033104/1&agg=rss Yu Fei Chan, Hai Jun Xu, Lei Cao, Ying Tang, De Yao Li et al.<br/> Large scale and highly ordered flowerlike ZnO/Si nanostructures are successfully prepared by combining two common techniques, viz. hydrothermally etch fabrication of nanoporous Si pillar array (NSPA) and self-catalytic chemical vapor transport growth of ZnO nanowires. Au nanoparticles are decorated ... [J. Appl. Phys. 111, 033104 (2012)] published Tue Feb 7, 2012. Deep traps and enhanced photoluminescence efficiency in nonpolar a-GaN/InGaN quantum well structures http://link.aip.org/link/?JAP/111/033103/1&agg=rss A. Y. Polyakov, Lee-Woon Jang, Dong-Seob Jo, In-Hwan Lee, N. B. Smirnov et al.<br/> Nonpolar (11-20) a-GaN/InGaN quantum well (QW) structures were grown by metalorganic chemical vapor deposition on r-plane (1-102) sapphire substrate using a two-stage growth procedure. Our studies demonstrate that, in contrast to polar QWs, these structures show the presence of deep electron traps w ... [J. Appl. Phys. 111, 033103 (2012)] published Fri Feb 3, 2012. Organic light-emitting diodes for lighting: High color quality by controlling energy transfer processes in host-guest-systems http://link.aip.org/link/?JAP/111/033102/1&agg=rss Caroline Weichsel, Sebastian Reineke, Mauro Furno, Bjorn Lussem, and Karl Leo<br/> Exciton generation and transfer processes in a multilayer organic light-emitting diode (OLED) are studied in order to realize OLEDs with warm white color coordinates and high color-rendering index (CRI). We investigate a host-guest-system containing four phosphorescent emitters and two matrix materi ... [J. Appl. Phys. 111, 033102 (2012)] published Fri Feb 3, 2012. 1D/2D switchable grating based on field-induced polymer stabilized blue phase liquid crystal http://link.aip.org/link/?JAP/111/033101/1&agg=rss Ji-Liang Zhu, Jian-Gang Lu, Jing Qiang, En-Wei Zhong, Zhi-Cheng Ye et al.<br/> We present a 1D/2D switchable grating based on field-induced polymer stabilized blue phase liquid crystal (PSBPLC). For 1D grating, the diffraction efficiency of the first order is 37.2% and the phase modulation depth of the 1D grating can achieve 2pi. For 2D grating, more than 90% of light intensit ... [J. Appl. Phys. 111, 033101 (2012)] published Thu Feb 2, 2012. An integrated hollow-core photonic crystal fiber transverse optical trapping system for optical manipulation and detection http://link.aip.org/link/?JAP/111/023106/1&agg=rss V. K. Shinoj and V. M. Murukeshan<br/> Optical manipulation, separation, and detection of biological cells have immense potential biomedical applications, for example, in disease detection. In this paper, we present optical manipulation and detection of micron sized fluorescent particles inside hollow-core photonic crystal fiber (HC-PCF) ... [J. Appl. Phys. 111, 023106 (2012)] published Tue Jan 31, 2012. Enhancement of the transverse non-reciprocal magneto-optical effect http://link.aip.org/link/?JAP/111/023103/1&agg=rss V. Zayets, H. Saito, S. Yuasa, and K. Ando<br/> The methods to enhance the transverse non-reciprocal magneto-optical (nMO) effect have been studied. The transverse nMO effect occurs in the case when light propagates perpendicularly to the magnetic field. It was demonstrated that light can experience the transverse nMO effect only when it propagat ... [J. Appl. Phys. 111, 023103 (2012)] published Mon Jan 23, 2012. Efficiency improvement in fullerene-layer-inserted organic bulk-heterojunction solar cells http://link.aip.org/link/?JAP/111/023104/1&agg=rss Zhihai Liu and Eun-Cheol Lee<br/> We have improved power conversion efficiencies of organic bulk-heterojunction solar cells with the active layer composed of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) by inserting a PCBM layer between the active layer and adjacent Al cathode. This improvement is ma ... [J. Appl. Phys. 111, 023104 (2012)] published Mon Jan 23, 2012. Substrate independence of THz vibrational modes of polycrystalline thin films of molecular solids in waveguide THz-TDS http://link.aip.org/link/?JAP/111/023105/1&agg=rss S. Sree Harsha, Joseph. S. Melinger, S. B. Qadri, and D. Grischkowsky<br/> The influence of the metal substrate on the measurement of high resolution THz vibrational modes of molecular solids with the waveguide THz-TDS technique is investigated. The sample film of salicylic acid is studied using waveguide THz-TDS on three different metal substrates and two-surface passivat ... [J. Appl. Phys. 111, 023105 (2012)] published Mon Jan 23, 2012. 41 GHz and 10.6 GHz low threshold and low noise InAs/InP quantum dash two-section mode-locked lasers in L band http://link.aip.org/link/?JAP/111/023102/1&agg=rss M. Dontabactouny, R. Piron, K. Klaime, N. Chevalier, K. Tavernier et al.<br/> This paper reports recent results on InAs/InP quantum dashbased, two-section, passively mode-locked lasers pulsing at 41 GHz and 10.6 GHz and emitting at 1.59 [mu]m at 20 degrees C. The 41-GHz device (1 mm long) starts lasing at 25 mA under uniform injection and the 10.6 GHz (4 mm long) at 71 mA. T ... [J. Appl. Phys. 111, 023102 (2012)] published Wed Jan 18, 2012. Influence of Dy coactivator on the luminescence properties of GdOS:Tb phosphor http://link.aip.org/link/?JAP/111/023101/1&agg=rss Fei Wang, Dachun Liu, Bin Yang, Jinchao Zhang, and Yongnian Dai<br/> GdOS:Tb, Dy phosphor were synthesized by co-precipitation method combined with solid-state reactions. The crystal structure and luminescent properties were investigated in this paper. It was confirmed that no new phase was introduced by the analysis of X-ray diffractions (XRD) and fluorescence spect ... [J. Appl. Phys. 111, 023101 (2012)] published Tue Jan 17, 2012. Modeling upconversion of erbium doped microcrystals based on experimentally determined Einstein coefficients http://link.aip.org/link/?JAP/111/013109/1&agg=rss Stefan Fischer, Heiko Steinkemper, Philipp Loper, Martin Hermle, and Jan Christoph Goldschmidt<br/> The upconversion of infrared photons is a promising possibility to enhance solar cell efficiency by producing electricity from otherwise unused sub-band-gap photons. We present a rate equation model and the relevant processes in order to describe the upconversion of near-infrared photons. The model ... [J. Appl. Phys. 111, 013109 (2012)] published Fri Jan 13, 2012. Simulation of laser-generated longitudinal and shear ultrasonic waves in a diamond anvil cell by the finite element method http://link.aip.org/link/?JAP/111/013107/1&agg=rss Wen Feng, Dexing Yang, Xiangchao Zhu, Yuning Guo, and Wei Liao<br/> Based on the thermoelastic theory, a numerical model of ultrasonic displacement field induced by a vertical incident pulsed laser in an aluminum film in a diamond anvil cell (DAC) is established by using the finite element method (FEM). After precisely calculating the transient temperature field dis ... [J. Appl. Phys. 111, 013107 (2012)] published Thu Jan 12, 2012. Depth measurements of drilled holes in bone by laser triangulation for the field of oral implantology http://link.aip.org/link/?JAP/111/013106/1&agg=rss D. Quest, C. Gayer, and P. Hering<br/> Laser osteotomy is one possible method of preparing beds for dental implants in the human jaw. A major problem in using this contactless treatment modality is the lack of haptic feedback to control the depth while drilling the implant bed. A contactless measurement system called laser triangulation ... [J. Appl. Phys. 111, 013106 (2012)] published Thu Jan 12, 2012. Time dynamics of self-pumped reflection gratings in a photorefractive polymer http://link.aip.org/link/?JAP/111/013108/1&agg=rss P. P. Banerjee, S. H. Buller, C. M. Liebig, S. A. Basun, G. Cook et al.<br/> The time dynamics of self-pumped reflection gratings in a commonly used photorefractive polymer PDCST:PVK:ECZ-BBP:C with no additional electron sources or traps is investigated. While holes are normally the mobile charges and responsible for grating formation, our experimental observations, analyzed ... [J. Appl. Phys. 111, 013108 (2012)] published Thu Jan 12, 2012. A flexible Bloch mode method for computing complex band structures and impedances of two-dimensional photonic crystals http://link.aip.org/link/?JAP/111/013105/1&agg=rss Felix J. Lawrence, Lindsay C. Botten, Kokou B. Dossou, R. C. McPhedran, and C. Martijn de Sterke<br/> We present a flexible method that can calculate Bloch modes, complex band structures, and impedances of two-dimensional photonic crystals from scattering data produced by widely available numerical tools. The method generalizes previous work which relied on specialized multipole and finite element m ... [J. Appl. Phys. 111, 013105 (2012)] published Wed Jan 11, 2012. Optical and structural characterization of thermal oxidation effects of erbium thin films deposited by electron beam on silicon http://link.aip.org/link/?JAP/111/013104/1&agg=rss Himani S. Kamineni, Vimal K. Kamineni, Richard L. Moore, Spyros Gallis, Alain C. Diebold et al.<br/> Thermal oxidation effects on the structural, compositional, and optical properties of erbium films deposited on silicon via electron beam evaporation were analyzed by x-ray diffraction, x-ray photoelectron spectroscopy, Auger electron spectroscopy, and spectroscopic ellipsometry. A gradual rise in o ... [J. Appl. Phys. 111, 013104 (2012)] published Fri Jan 6, 2012.