APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

26 Oct 2009

Volume 95, Issue 17, Articles (17xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 95, 173701 (2009); http://dx.doi.org/10.1063/1.3255041 (3 pages)

G. Bison, N. Castagna, A. Hofer, P. Knowles, J.-L. Schenker, M. Kasprzak, H. Saudan, and A. Weis
Enlarge Image | Read More
Page 1 of 4 Pages Next Page | Jump to Page
back to top
RSS Feeds

Refractive index dispersion deduced from lasing modes in ZnO microtetrapods

V. V. Ursaki, V. V. Zalamai, I. M. Tiginyanu, A. Burlacu, E. V. Rusu, and C. Klingshirn

Appl. Phys. Lett. 95, 171101 (2009); http://dx.doi.org/10.1063/1.3254222 (3 pages) | Cited 3 times

Online Publication Date: 26 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
High optical quality, well end leg faceted ZnO microtetrapods sustaining lasing modes with quality factors of 2500–3000 have been grown by carbothermal chemical vapor deposition. It is shown that lasing is due to longitudinal Fabry–Pérot modes in individual tetrapod legs and the analysis of the wavelength position of these modes is an effective instrument for the investigation of temperature dependence of the refractive index dispersion in the region of exciton resonances. The dispersion of the ZnO refractive index is experimentally determined in the temperature interval from 10 to 300 K and is compared with available literature data.
Show PACS
42.55.Px Semiconductor lasers; laser diodes
42.60.By Design of specific laser systems
42.55.Sa Microcavity and microdisk lasers
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

Otto-coupled surface plasmons in a liquid crystal cell

Lizhen Ruan, Fuzi Yang, and J. R. Sambles

Appl. Phys. Lett. 95, 171102 (2009); http://dx.doi.org/10.1063/1.3242363 (3 pages) | Cited 1 time

Online Publication Date: 26 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Surface plasmons on silver in the visible domain are excited using a several micron thick layer of liquid crystal as the optical tunnel barrier. This thickness is possible when the orientation of the director in the liquid crystal varies from homeotropic at the entrance surface (against the coupling prism) to homogeneous on the thick silver layer at the other side of the cell, with the director tilting in a plane normal to the plane of incidence. This geometry also allows the excitation of guided modes, which mixes with the surface plasmon resonance. Both types of mode are then explored as a function of applied voltage.
Show PACS
61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order
68.55.-a Thin film structure and morphology
78.68.+m Optical properties of surfaces
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

Impact of high-order surface plasmon modes of metal nanoparticles on enhancement of optical emission

G. Sun, J. B. Khurgin, and C. C. Yang

Appl. Phys. Lett. 95, 171103 (2009); http://dx.doi.org/10.1063/1.3250160 (3 pages) | Cited 10 times

Online Publication Date: 27 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We consider the impact of high-order surface plasmon modes supported by the metal nanoparticles on the efficiency enhancement of optical emission. Using the example of Au nanosphere embedded in the GaN dielectric, we show that for an emitter with certain original radiative efficiency, placing the emitter too close to the metal sphere does not always produce additional enhancement. Thus our model provides analytical treatment of the luminescence quenching and can be used to optimize both nanoparticle size and its separation from the emitter to yield maximum enhancement.
Show PACS
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
78.55.Hx Other solid inorganic materials
78.67.Bf Nanocrystals, nanoparticles, and nanoclusters

Strongly birefringent metamaterials as negative index terahertz wave plates

P. Weis, O. Paul, C. Imhof, R. Beigang, and M. Rahm

Appl. Phys. Lett. 95, 171104 (2009); http://dx.doi.org/10.1063/1.3253414 (3 pages) | Cited 12 times

Online Publication Date: 27 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report an alternative approach for the design and fabrication of thin wave plates with high transmission in the terahertz regime. The wave plates are based on strongly birefringent cut-wire-pair metamaterials that exhibit refractive indices of opposite signs for orthogonal polarization components of an incident wave. As examples, we fabricated and investigated a quarter- and a half-wave plate with high intensity transmittance. The wave plates displayed a maximum figure of merit (FOM) of 23 at a frequency around 1.3 THz where the refractive index was n′ = −1.7. This corresponds to one of the highest FOMs reported at terahertz frequencies.
Show PACS
42.79.Ci Filters, zone plates, and polarizers
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
42.70.-a Optical materials
84.40.-x Radiowave and microwave (including millimeter wave) technology
78.20.Fm Birefringence

Influence of GeSi interfacial layer on Ge–Ge optical phonon mode in SiO2 films embedded with Ge nanocrystals

L. Z. Liu, F. Gao, X. L. Wu, T. H. Li, and Paul K. Chu

Appl. Phys. Lett. 95, 171105 (2009); http://dx.doi.org/10.1063/1.3257379 (3 pages) | Cited 4 times

Online Publication Date: 28 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The Ge–Ge optical phonon peak at 300 cm−1 acquired from amorphous SiO2 films embedded with Ge nanocrystals by Raman scattering is sensitive to the Si content. When the Si concentration is high, a thin GeSi interfacial layer forms around the Ge nanocrystals. A tensile stress is produced to partially offset the compressive stress imposed by the SiO2 matrix on the Ge nanocrystals, consequently downshifting the frequency of the optical phonon and increasing its linewidth. Theoretical calculation based on phonon confinement and compressive effects discloses that the interfacial layer plays a crucial role in the optical phonon behavior.
Show PACS
63.22.Kn Clusters and nanocrystals
63.20.D- Phonon states and bands, normal modes, and phonon dispersion
78.67.Bf Nanocrystals, nanoparticles, and nanoclusters
62.20.F- Deformation and plasticity
81.40.Lm Deformation, plasticity, and creep
62.25.-g Mechanical properties of nanoscale systems
78.30.Am Elemental semiconductors and insulators

Experimental observation of subluminal and superluminal light propagation in rhodamine 6G-doped polymethyl methacrylate

Wending Zhang, Feng Gao, Guoquan Zhang, Wei Li, Xinzheng Zhang, and Jingjun Xu

Appl. Phys. Lett. 95, 171106 (2009); http://dx.doi.org/10.1063/1.3254229 (3 pages) | Cited 1 time

Online Publication Date: 28 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Nondegenerate two-wave coupling process and group velocity change in the paraxial part of an intensity-modulated and focused transverse electromagnetic beam (TEM00 beam in the article) was observed in the rhodamine 6G(R6G)-doped polymethyl methacrylate (PMMA) but not in the pure PMMA. The typical superluminal result was −5.1 m/s and the subluminal result was 9.19 m/s, respectively. Furthermore, the results provide a support to our former conclusion that nondegenerate two-wave couplinglike mechanism could be used to change the group velocity of the paraxial part of a focused TEM00 beam in materials with nondegenerate two-wave coupling process.
Show PACS
42.70.Jk Polymers and organics
42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation

Soliton source generation in a few-mode tellurite microstructure fiber

Xin Yan, Guanshi Qin, Meisong Liao, Takenobu Suzuki, Atsushi Mori, and Yasutake Ohishi

Appl. Phys. Lett. 95, 171107 (2009); http://dx.doi.org/10.1063/1.3254238 (3 pages) | Cited 1 time

Online Publication Date: 29 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report broad near-infrared soliton and associated dispersive wave source generation (1228–1867 nm) and tunable green third harmonic generation (528–542 nm) by LP11 mode excitation in a few-mode tellurite microstructure fiber pumped by a 1557 nm femtosecond fiber laser. The fiber presents a wide range of wavelengths in which the fundamental mode experiences normal dispersion, whereas the higher-order modes propagate in the anomalous dispersion regime. LP01 or LP11 mode can be selectively excited, and obviously different spectra are obtained based on the different mechanisms of supercontinuum generation.
Show PACS
42.65.Tg Optical solitons; nonlinear guided waves
42.72.Ai Infrared sources
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
42.55.Wd Fiber lasers
42.65.Re Ultrafast processes; optical pulse generation and pulse compression
42.81.Dp Propagation, scattering, and losses; solitons

A scattering model for surface-textured thin films

Klaus Jäger and Miro Zeman

Appl. Phys. Lett. 95, 171108 (2009); http://dx.doi.org/10.1063/1.3254239 (3 pages) | Cited 13 times

Online Publication Date: 29 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We present a mathematical model that relates the surface morphology of randomly surface-textured thin films with the intensity distribution of scattered light. The model is based on the first order Born approximation [see e.g., M. Born and E. Wolf, Principles of Optics, 7th ed. (Cambridge University Press, Cambridge, England, 1999) ] and on Fraunhofer scattering. Scattering data of four transparent conductive oxide films with different surface textures were used to validate the model and good agreement between the experimental and calculated intensity distribution was obtained.
Show PACS
78.66.Hf II-VI semiconductors
68.35.bg Semiconductors
68.55.J- Morphology of films

Pulsed-laser printing of organic thin-film transistors

Ludovic Rapp, Abdou Karim Diallo, Anne Patricia Alloncle, Christine Videlot-Ackermann, Frédéric Fages, and Philippe Delaporte

Appl. Phys. Lett. 95, 171109 (2009); http://dx.doi.org/10.1063/1.3255011 (3 pages) | Cited 19 times

Online Publication Date: 29 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Organic thin-film transistors have been fabricated using laser-induced forward transfer as spatially resolved laser-printing method. Using this technique, source and drain electrodes were deposited from silver nanoparticle ink and the copper phthalocyanine (CuPc) was used to form the active layer. Both kinds of materials were transferred from a donor substrate onto a receiver substrate upon irradiation with laser pulses in the picosecond regime. The latter substrate formed the gate and the dielectric of the transistor. Electrical characterizations showed that the transistors are fully operative, showing well-defined linear and saturation regimes in the I-V curves.
Show PACS
85.30.Tv Field effect devices
42.60.-v Laser optical systems: design and operation

All-optical phase modulations in a silicon wire waveguide at ultralow light levels

Nobuyuki Matsuda (松田信幸), Ryosuke Shimizu (清水亮介), Yasuyoshi Mitsumori (三森康義), Hideo Kosaka (小坂英男), Aya Sato (佐藤綾耶), Hiroyuki Yokoyama (横山弘之), Koji Yamada (山田浩治), Toshifumi Watanabe (渡辺俊文), Tai Tsuchizawa (土澤泰), Hiroshi Fukuda (福田浩), Seiichi Itabashi (板橋聖一), and Keiichi Edamatsu (枝松圭一)

Appl. Phys. Lett. 95, 171110 (2009); http://dx.doi.org/10.1063/1.3257378 (3 pages) | Cited 6 times

Online Publication Date: 30 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Cross-phase modulation (XPM) in a silicon wire waveguide at 1.55 μm telecom band was studied down to ultralow light levels. In the low-power regime, we found that free-carrier dispersion as well as the optical Kerr effect contributes to the XPM. Possible mechanisms of the low-power XPM are discussed.
Show PACS
42.60.Fc Modulation, tuning, and mode locking
42.79.Hp Optical processors, correlators, and modulators
42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation

Cavity-enhanced photocurrent generation by 1.55 μm wavelengths linear absorption in a p-i-n diode embedded silicon microring resonator

Hui Chen, Xianshu Luo, and Andrew W. Poon

Appl. Phys. Lett. 95, 171111 (2009); http://dx.doi.org/10.1063/1.3257384 (3 pages) | Cited 14 times

Online Publication Date: 30 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We demonstrate 20-fold cavity-enhanced photocurrent generation in 1.55 μm wavelengths in a p-i-n diode embedded silicon microring resonator with Q factor of 8000. The on-resonance wavelength shows linear responsivity of 0.12 mA/W upon 0 V bias and 0.25 mA/W upon −15 V bias. We attribute the linear absorption to surface-state absorption at the microring waveguide interfaces. Our experiments indicate that the photocurrent generation is linear to the estimated coupled power up to ∼ 500 μW.
Show PACS
85.30.Kk Junction diodes
85.60.-q Optoelectronic devices

Plasmonic waveguide as an efficient transducer for high-density data storage

D. O’Connor, M. McCurry, B. Lafferty, and A. V. Zayats

Appl. Phys. Lett. 95, 171112 (2009); http://dx.doi.org/10.1063/1.3257701 (3 pages) | Cited 7 times

Online Publication Date: 30 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A design of high optical throughput nanoscale light sources has been proposed based on plasmonic wedge waveguides. It provides localization of the 1500 nm wavelength light at the output of less than 30×30 nm2 area at about 80% coupling efficiency from a dielectric loaded surface plasmon polariton waveguide and nearly 90% efficient power deposition in the absorbing media placed at the output for an experimentally viable 10 nm apex radius of the wedge. Such nanoscale light sources can be useful for high-density data storage, scanning near-field optical microscopy, and sensing.
Show PACS
42.79.Gn Optical waveguides and couplers
07.07.Mp Transducers
42.15.Eq Optical system design
42.72.Ai Infrared sources

Terahertz microfluidic sensor based on a parallel-plate waveguide resonant cavity

Rajind Mendis, Victoria Astley, Jingbo Liu, and Daniel M. Mittleman

Appl. Phys. Lett. 95, 171113 (2009); http://dx.doi.org/10.1063/1.3251079 (3 pages) | Cited 21 times

Online Publication Date: 30 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We describe a terahertz optical resonator that is ideally suited for highly sensitive and noninvasive refractive-index monitoring. The resonator is formed by machining a rectangular groove into one plate of a parallel-plate waveguide, and is excited using the lowest-order transverse-electric (TE1) waveguide mode. Since the resonator can act as a channel for fluid flow, it can be easily integrated into a microfluidics platform for real-time monitoring. Using this resonator with only a few microliters of liquid, we demonstrate a refractive-index sensitivity of 3.7×105 nm/refractive-index-unit, the highest ever reported in any frequency range.
Show PACS
42.79.Pw Imaging detectors and sensors
42.79.Gn Optical waveguides and couplers
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing

Conoscopic observation of director reorientation during Poiseuille flow of a nematic liquid crystal

C. J. Holmes, S. L. Cornford, and J. R. Sambles

Appl. Phys. Lett. 95, 171114 (2009); http://dx.doi.org/10.1063/1.3251792 (3 pages) | Cited 4 times

Online Publication Date: 30 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Director reorientation under pressure driven (Poiseuille) flow is observed conoscopically for the liquid crystal 5CB aligned at an azimuthal angle of 45° to the direction of flow. A polyimide surface treatment (AL 1254) is used to promote planar homogeneous alignment and rubbed to produce an initial azimuthal alignment angle ϕ0. Conoscopic interference figure rotation is documented as a function of flow rate and compared to that produced from numerical models using Leslie–Ericksen–Parodi theory. Model and data show excellent agreement.
Show PACS
61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order
47.60.Dx Flows in ducts and channels
66.20.Cy Theory and modeling of viscosity and rheological properties, including computer simulation
61.30.Hn Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions
back to top
RSS Feeds

Switchable fluorescent liquid crystals

M. Salamonczyk, A. Kovarova, J. Svoboda, D. Pociecha, and E. Gorecka

Appl. Phys. Lett. 95, 171901 (2009); http://dx.doi.org/10.1063/1.3250163 (3 pages) | Cited 3 times

Online Publication Date: 26 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Properties of new fluorescent, mesogenic compounds bearing [2]benzothiophene moiety are presented. Materials show strong fluorescence of green or red light with quantum yield up to 30%, in liquid crystalline phases the emitted light is strongly polarized. For material forming ferroelectric liquid crystal or doped into polar smectic matrix, the possibility of controlling fluorescence light intensity through the application of electric field is shown.
Show PACS
61.30.Eb Experimental determinations of smectic, nematic, cholesteric, and other structures
61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order
78.30.C- Liquids
64.70.mj Experimental studies of liquid crystal transitions

Enhanced room-temperature quantum-dot effects in modulation-doped InAs/GaAs quantum dots

Y. D. Jang, J. Park, D. Lee, D. J. Mowbray, M. S. Skolnick, H. Y. Liu, M. Hopkinson, and R. A. Hogg

Appl. Phys. Lett. 95, 171902 (2009); http://dx.doi.org/10.1063/1.3255017 (3 pages) | Cited 5 times

Online Publication Date: 26 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Modulation-doped InAs/GaAs quantum dots (QDs) show bright photoluminescence (PL) at 300 K, linear increase of PL intensity on excitation at 300 K and rather temperature insensitive PL intensity and carrier lifetime, in contrast to undoped QDs. Systematic analyses indicate that those advantageous behaviors come from the enhanced Coulomb attraction due to excess carriers in doped QDs. The stronger Coulomb interaction increases the thermal activation energy, keeps more carriers in QDs, and provides enhanced QD characteristics at room temperature.
Show PACS
68.65.Hb Quantum dots (patterned in quantum wells)
81.07.Ta Quantum dots
81.05.Ea III-V semiconductors
78.55.Cr III-V semiconductors
73.23.Hk Coulomb blockade; single-electron tunneling

Effect of substrate piezoelectricity on surface acoustic wave propagation in humidity-sensitive structures with porphyrin layers

D. Čiplys, R. Rimeika, A. Sereika, V. Poderys, R. Rotomskis, and M. S. Shur

Appl. Phys. Lett. 95, 171903 (2009); http://dx.doi.org/10.1063/1.3254244 (3 pages) | Cited 1 time

Online Publication Date: 27 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The impact of air humidity on surface acoustic wave (SAW) propagation in different piezoelectric substrates (lithium niobate, lithium tantalate, and gallium nitride on sapphire) with nanostructured meso-tetra(4 sulfonatophenyl) porphyrin (TPPS4) overlays has been investigated. The humidity-induced increase in SAW attenuation is proportional to the electromechanical coupling constant of the substrate and is attributed to the viscoelastic loss due to interaction of water adsorbing TPPS4 material with electric field of the SAW. The humidity-induced decrease in SAW velocity does not depend on the substrate piezoelectric properties and is explained by the changes in TPPS4 layer mechanical properties due to adsorbed moisture.
Show PACS
77.65.-j Piezoelectricity and electromechanical effects
62.65.+k Acoustical properties of solids
61.46.-w Structure of nanoscale materials
68.55.-a Thin film structure and morphology
68.43.Mn Adsorption kinetics
81.40.Jj Elasticity and anelasticity, stress-strain relations

Design and characterization of bubble phononic crystals

Valentin Leroy, Alice Bretagne, Mathias Fink, Hervé Willaime, Patrick Tabeling, and Arnaud Tourin

Appl. Phys. Lett. 95, 171904 (2009); http://dx.doi.org/10.1063/1.3254243 (3 pages) | Cited 8 times

Online Publication Date: 28 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report the practical realization of phononic crystals with gas inclusions, using soft lithography techniques. Ultrasonic experiments from 0.3 to 5 MHz confirm the existence of deep and wide minima of transmission through the crystal. We show that the first gap is due to the combined effects of Bragg reflections and bubble resonances. We propose a simple layered model that gives a reasonable prediction of the ultrasonic transmission.
Show PACS
63.20.-e Phonons in crystal lattices
61.72.Qq Microscopic defects (voids, inclusions, etc.)
62.65.+k Acoustical properties of solids

An oxide thermal rectifier

W. Kobayashi, Y. Teraoka, and I. Terasaki

Appl. Phys. Lett. 95, 171905 (2009); http://dx.doi.org/10.1063/1.3253712 (3 pages) | Cited 29 times

Online Publication Date: 29 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We have experimentally demonstrated thermal rectification as bulk effect. According to a theoretical design of a thermal rectifier, we have prepared an oxide thermal rectifier made of two cobalt oxides with different thermal conductivities, and have made an experimental system to detect the thermal rectification. The rectifying coefficient of the device is found to be 1.43, which is in good agreement with the numerical calculation.
Show PACS
85.80.Fi Thermoelectric devices
47.80.Fg Pressure and temperature measurements
07.20.Dt Thermometers
84.30.Jc Power electronics; power supply circuits

Shape memory and superelasticity in polycrystalline Cu–Al–Ni microwires

Ying Chen, Xuexi Zhang, David C. Dunand, and Christopher A. Schuh

Appl. Phys. Lett. 95, 171906 (2009); http://dx.doi.org/10.1063/1.3257372 (3 pages) | Cited 6 times

Online Publication Date: 29 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report a strategy to significantly improve the ductility and achieve large superelastic and shape memory strains in polycrystalline Cu–Al–Ni shape memory alloys that are normally brittle. We use a liquid-phase (Taylor) wire forming process to obtain microwires of 10–150 μm diameter with a bamboo grain structure. The reduction of grain boundary area, removal of triple junctions, and introduction of a high specific surface area in the wire decrease constraints on the martensitic transformation, and permit both superelasticity and stress-assisted two-way shape memory with recoverable strains as high as 6.8%.
Show PACS
81.40.Lm Deformation, plasticity, and creep
62.20.fg Shape-memory effect; yield stress; superelasticity
64.70.kd Metals and alloys
61.72.Mm Grain and twin boundaries
81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.fk Ductility, malleability
81.30.Kf Martensitic transformations

Short range ordering in Fe–Ge and Fe–Ga single crystals

Mianliang Huang and Thomas A. Lograsso

Appl. Phys. Lett. 95, 171907 (2009); http://dx.doi.org/10.1063/1.3254249 (3 pages) | Cited 7 times

Online Publication Date: 29 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report on the nature of short range ordering (SRO) in slow cooled (100) and (111) Fe81.6Ga18.4 and Fe81Ge9 single crystals determined by x-ray θ-2θ scans. The SRO of the Ga atoms has at least some D03 character. In contrast Ge atoms only exhibit B2 chemical ordering symmetries in the short range order. It has been proposed that the D03 character in the SRO is important for the enhancement in magnetoelasticity in Fe-based alloys; however the presence of B2 character in Fe–Ge alloys suggest that the SRO is not of primary importance in increasing the magnetostriction.
Show PACS
75.80.+q Magnetomechanical effects, magnetostriction
75.40.-s Critical-point effects, specific heats, short-range order
61.66.Dk Alloys

Mg doping and its effect on the semipolar GaN(11math2) growth kinetics

L. Lahourcade, J. Pernot, A. Wirthmüller, M. P. Chauvat, P. Ruterana, A. Laufer, M. Eickhoff, and E. Monroy

Appl. Phys. Lett. 95, 171908 (2009); http://dx.doi.org/10.1063/1.3256189 (3 pages) | Cited 4 times

Online Publication Date: 29 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report the effect of Mg doping on the growth kinetics of semipolar GaN(11math2) synthesized by plasma-assisted molecular-beam epitaxy. Mg tends to segregate on the surface, inhibiting the formation of the self-regulated Ga film which is used as a surfactant for the growth of undoped and Si-doped GaN(11math2). We observe an enhancement of Mg incorporation in GaN(11math2) compared to GaN(0001). Typical structural defects or polarity inversion domains found in Mg-doped GaN(0001) were not observed for the semipolar films investigated in the present study.
Show PACS
68.55.ag Semiconductors
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
68.35.Dv Composition, segregation; defects and impurities
61.72.uj III-V and II-VI semiconductors

Mg doping of thermochromic VO2 films enhances the optical transmittance and decreases the metal-insulator transition temperature

N. R. Mlyuka, G. A. Niklasson, and C. G. Granqvist

Appl. Phys. Lett. 95, 171909 (2009); http://dx.doi.org/10.1063/1.3229949 (3 pages) | Cited 15 times

Online Publication Date: 29 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Thermochromic films of MgxV1−xO2 were made by reactive dc magnetron sputtering onto heated glass. The metal-insulator transition temperature decreased by ∼ 3 K/at. %Mg, while the optical transmittance increased concomitantly. Specifically, the transmittance of visible light and of solar radiation was enhanced by ∼ 10% when the Mg content was ∼ 7 at. %. Our results point at the usefulness of these films for energy efficient fenestration.
Show PACS
78.20.N- Thermo-optic effects
78.20.nb Photothermal effects
81.15.Cd Deposition by sputtering
71.30.+h Metal-insulator transitions and other electronic transitions
78.66.Nk Insulators
61.72.up Other materials

Mg-based metallic glass/titanium interpenetrating phase composite with high mechanical performance

Y. Sun, H. F. Zhang, A. M. Wang, H. M. Fu, Z. Q. Hu, C. E. Wen, and P. D. Hodgson

Appl. Phys. Lett. 95, 171910 (2009); http://dx.doi.org/10.1063/1.3257699 (3 pages) | Cited 6 times

Online Publication Date: 30 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report an Mg-based metallic glass/titanium interpenetrating phase composite in which constituent phases form a homogeneously interconnected network. The porous titanium constrains shear bands propagation thoroughly and promotes shear bands branching and intersection subsequently. The homogeneous phase distribution promotes regularly distributed local shear deformation and leads to a uniform deformation for the composites. Moreover, the interpenetrating phase structure introduces a mutual-reinforcement between metallic glass and titanium. Therefore, the composite exhibits excellent mechanical performance with compressive fracture strength of 1783 MPa and fracture strain of 31%.
Show PACS
81.40.Lm Deformation, plasticity, and creep
62.20.F- Deformation and plasticity
62.25.Mn Fracture/brittleness
81.40.Np Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure

An ultrasmall wavelength-selective channel drop switch using a nanomechanical photonic crystal nanocavity

Yoshiaki Kanamori, Kazunori Takahashi, and Kazuhiro Hane

Appl. Phys. Lett. 95, 171911 (2009); http://dx.doi.org/10.1063/1.3254247 (3 pages) | Cited 2 times

Online Publication Date: 30 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We propose a nanomechanical channel drop switch by controlling the submicron distance between a nanocavity and photonic crystal (PC) waveguide with an ultrasmall electrostatic comb actuator. Light propagating in the PC waveguide is coupled with a nanocavity and emitted as a drop signal under a resonant condition. The proposed switch has been fabricated by silicon micromachining. The drop efficiency has been controlled by 12.5 dB and gap change of 600 nm.
Show PACS
42.79.Sz Optical communication systems, multiplexers, and demultiplexers
42.82.-m Integrated optics
42.70.Qs Photonic bandgap materials
Page 1 of 4 Pages Next Page | Jump to Page
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close