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

25 Jan 2010

Volume 96, Issue 4, Articles (04xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 96, 042501 (2010); http://dx.doi.org/10.1063/1.3291942 (3 pages)

Daniel Stickler, Robert Frömter, Holger Stillrich, Christian Menk, Carsten Tieg, Simone Streit-Nierobisch, Michael Sprung, Christian Gutt, Lorenz-M. Stadler, Olaf Leupold, Gerhard Grübel, and Hans Peter Oepen
Enlarge Image | Read More
Page 1 of 5 Pages Next Page | Jump to Page
back to top
RSS Feeds

Triply-resonant optical parametric oscillator by four-wave mixing with rubidium vapor inside an optical cavity

Xudong Yu (于旭东), Min Xiao (肖敏), and Jing Zhang (张靖)

Appl. Phys. Lett. 96, 041101 (2010); http://dx.doi.org/10.1063/1.3295694 (3 pages) | Cited 1 time

Online Publication Date: 26 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We present an experimental demonstration of simultaneous above-threshold oscillations of the Stokes and anti-Stokes fields together with the single pumping beam with rubidium atoms inside an optical standing-wave cavity. The triple resonant conditions can be achieved easily by making use of the large dispersions due to two-photon transitions in the three-level atomic system. This work provides a way to achieve high efficient nonlinear frequency conversion and the generated bright Stokes and anti-Stokes cavity output beams are potential resource for applications in quantum information science.
Show PACS
42.65.Yj Optical parametric oscillators and amplifiers
42.65.Lm Parametric down conversion and production of entangled photons
42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation
42.50.Hz Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift

Arbitrary waveguide bends using isotropic and homogeneous metamaterial

Weiqiang Ding, Donghua Tang, Yan Liu, Lixue Chen, and Xiudong Sun

Appl. Phys. Lett. 96, 041102 (2010); http://dx.doi.org/10.1063/1.3298367 (3 pages) | Cited 15 times

Online Publication Date: 27 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We propose a method for arbitrary waveguide bends using impedance matched metamaterial with negative index of refraction. We analyze the operation principles and verify the performances using the finite difference in time domain method. Results show that nearly perfect transmission without mode distortion can be obtained when the bending angle changes within (0,180) degrees. The bending structure is very efficient and compact in size, and no anisotropic or inhomogeneous materials are required, which make the bend very easy in fabrication and application.
Show PACS
42.79.Gn Optical waveguides and couplers
42.25.Gy Edge and boundary effects; reflection and refraction
42.25.Bs Wave propagation, transmission and absorption
42.70.-a Optical materials

Metamaterial as a controllable template for nanoscale field localization

T. S. Kao, F. M. Huang, Y. Chen, E. T. F. Rogers, and N. I. Zheludev

Appl. Phys. Lett. 96, 041103 (2010); http://dx.doi.org/10.1063/1.3291675 (3 pages) | Cited 3 times

Online Publication Date: 27 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report that subwavelength localization of light in the near-field of a double-periodic photonic metamaterial may be efficiently controlled by the polarization and wavelength of the incident radiation. A dramatic variation in the periodic near-field landscapes, including a transition from a pattern of isolated subwavelength plasmon hot-spots to a blurred, low contrast pattern, accompanied by a change in the pattern’s symmetry has been observed in the proximity of an aluminum nanowire “fish-scale” nanostructure. Hot-spots as small as 0.23λ have been achieved and their position has been controlled by tuning the wavelength of incident light across the dipole absorption resonance of the metamaterial. A simple switch of the polarization state can lead to a spatial period doubling in the landscape pattern.
Show PACS
78.67.Pt Multilayers; superlattices; photonic structures; metamaterials
78.67.Uh Nanowires
42.25.Ja Polarization
42.25.Bs Wave propagation, transmission and absorption
42.70.-a Optical materials

Polymer/carbon nanotube composite patterns via laser induced forward transfer

Christos Boutopoulos, Christos Pandis, Konstantinos Giannakopoulos, Polycarpos Pissis, and Ioanna Zergioti

Appl. Phys. Lett. 96, 041104 (2010); http://dx.doi.org/10.1063/1.3299004 (3 pages) | Cited 9 times

Online Publication Date: 27 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Direct and high spatial resolution printing of polymer/carbon nanotube (CNT) composite layers has been demonstrated by means of laser induced forward transfer (LIFT). Laser irradiation of composite target materials, such as poly(acrylic acid)/CNT and polyvinylpyrrolidone/CNT, enabled dry deposition of well resolved composite pixels onto glass substrates. The dispersion of the CNT into the deposited composite pixels was investigated by transmission electron microscopy. The LIFT technique was also employed for the accurate deposition of polymer/CNT composite pixels onto aluminum microelectrodes for the fabrication of chemical sensors based on polymer/CNT compounds.
Show PACS
81.07.De Nanotubes
61.46.Fg Nanotubes
61.82.Pv Polymers, organic compounds

Low loss silicon fibers for photonics applications

Laura Lagonigro, Noel Healy, Justin R. Sparks, Neil F. Baril, Pier J. A. Sazio, John V. Badding, and Anna C. Peacock

Appl. Phys. Lett. 96, 041105 (2010); http://dx.doi.org/10.1063/1.3294630 (3 pages) | Cited 21 times

Online Publication Date: 27 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Silicon fibers are fabricated using a high pressure chemical deposition technique to deposit the semiconductor material inside a silica capillary. The silicon is deposited in an amorphous state into pure silica capillaries and can be crystallized to polysilicon after the deposition via a high temperature anneal. Optical transmission measurements of various amorphous and polycrystalline core materials were performed in order to determine their linear losses. Incorporating silicon functionality inside the fiber geometry opens up new possibilities for the next generation of integrated silicon photonics devices.
Show PACS
42.81.Bm Fabrication, cladding, and splicing
42.82.-m Integrated optics
42.79.-e Optical elements, devices, and systems
61.72.Cc Kinetics of defect formation and annealing
78.66.Jg Amorphous semiconductors; glasses
78.66.Db Elemental semiconductors and insulators

Bistable effect in the liquid crystal blue phase

Chun-Ta Wang, Hu-Yi Liu, Hsin-Hui Cheng, and Tsung-Hsien Lin

Appl. Phys. Lett. 96, 041106 (2010); http://dx.doi.org/10.1063/1.3293302 (3 pages) | Cited 4 times

Online Publication Date: 28 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
This study investigates the bistable effect and transition mechanism between various lattice orientations in the negative liquid crystal blue phase. The blue phase exists over a wide temperature range ∼ 16 °C, and three lattices (110), (112), and (200) are confirmed with Kossel diagrams. The red platelet (110) lattice and blue platelet (200) lattice can be stabilized and switched to each other by particular pulse voltages. An electric field induced planar state and electrohydrodynamatic effect in the blue phase is also investigated. Additionally, the reflected color of the (200) lattice can be adjusted from 455 to 545 nm by temperature induced lattice distortions and provided with reversibility.
Show PACS
61.30.Mp Blue phases and other defect-phases
64.70.mj Experimental studies of liquid crystal transitions
61.30.Eb Experimental determinations of smectic, nematic, cholesteric, and other structures
47.65.-d Magnetohydrodynamics and electrohydrodynamics
61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order

ac excitation of organic light emitting devices utilizing conductive charge generation layers

Jan Brückner, Nico Christ, Olga Bauder, Christian Gärtner, Moritz Seyfried, Felix Glöckler, Uli Lemmer, and Martina Gerken

Appl. Phys. Lett. 96, 041107 (2010); http://dx.doi.org/10.1063/1.3294326 (3 pages) | Cited 2 times

Online Publication Date: 28 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The ac-field-induced charge carrier generation and recombination is studied in an asymmetric conjugated polymer light emitting device based on one injecting electrode and one electrode separated by an insulating layer. Under operation with 130 kHz light intensity emitted by the device exhibits a pronounced asymmetry with respect to the polarity of the electric field. Numerical simulations show that this behavior can be explained by the significantly different mobilities of electrons and holes in the conjugated polymer. This approach enables insight into the device physics of organic light emitting devices with internal charge generation and allows direct investigation of hole and electron mobilities in one single device.
Show PACS
85.60.Jb Light-emitting devices

Two-photon fluorescence excitation with a microlens fabricated on the fused silica chip by femtosecond laser micromachining

Fei He, Ya Cheng, Lingling Qiao, Chen Wang, Zhizhan Xu, Koji Sugioka, Katsumi Midorikawa, and Ji Wu

Appl. Phys. Lett. 96, 041108 (2010); http://dx.doi.org/10.1063/1.3294627 (3 pages) | Cited 9 times

Online Publication Date: 28 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report on the fabrication of a microlens on a fused silica chip with excellent optical performance by femtosecond laser microfabrication. We show, both in theory and experimentally, that the fabricated microlens offers a high resolution approaching the optical diffraction limit. Moreover, two-photon excitation of fluorescence with the fabricated microlens is demonstrated. The lateral and axial resolutions of fluorescence are measured to be ∼ 1.7 and 12.3 μm, respectively.
Show PACS
42.79.Bh Lenses, prisms and mirrors
42.82.Cr Fabrication techniques; lithography, pattern transfer
42.50.Hz Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift
42.65.Re Ultrafast processes; optical pulse generation and pulse compression
42.62.Cf Industrial applications

High figure-of-merit ultrathin metal transparent electrodes incorporating a conductive grid

D. S. Ghosh, T. L. Chen, and V. Pruneri

Appl. Phys. Lett. 96, 041109 (2010); http://dx.doi.org/10.1063/1.3299259 (3 pages) | Cited 9 times

Online Publication Date: 29 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
It is known that ultrathin (<10 nm) metal films (UTMFs) can achieve high level of optical transparency at the expense of the electrical sheet resistance. In this letter, we propose a design, the incorporation of an ad hoc conductive grid, which can significantly reduce the sheet resistance of UTMF based transparent electrodes, leaving practically unchanged their transparency. The calculated highest figure-of-merit corresponds to a filling factor and a grid spacing-to-linewidth ratio of 0.025 and 39, respectively. To demonstrate the capability of the proposed method the sheet resistance of a continuous 2 nm Ni film (>950 Ω/◻) is reduced to ∼ 6.5 Ω/◻ when a 100 nm thick Cu grid is deposited on it. The transparency is instead maintained at values exceeding 75%. These results, which can be further improved by making thicker grids, already demonstrate the potential in applications, such as photovoltaic cells, optical detectors and displays.
Show PACS
81.05.Bx Metals, semimetals, and alloys
85.60.Gz Photodetectors (including infrared and CCD detectors)
85.60.Ha Photomultipliers; phototubes and photocathodes
85.60.Pg Display systems
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

A route to improved extraction efficiency of light-emitting diodes

H. Zhu, C. X. Shan, L. K. Wang, Y. Yang, J. Y. Zhang, B. Yao, D. Z. Shen, and X. W. Fan

Appl. Phys. Lett. 96, 041110 (2010); http://dx.doi.org/10.1063/1.3301614 (3 pages) | Cited 7 times

Online Publication Date: 29 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The electroluminescence from an n-MgZnO/i-ZnO/MgO/p-GaN asymmetric double heterojunction has been demonstrated. With the injection of electrons from n-MgZnO and holes from p-GaN, an intense ultraviolet emission coming from the ZnO active layer was observed. It is revealed that the emission intensity of the diode recorded from the MgZnO side is significantly larger than that from the MgO side because of the asymmetric waveguide structure formed by the lower refractive index of MgO than that of MgZnO. The asymmetric waveguide structure reported in this letter may promise a simple and effective route to light-emitting diodes with improved light-extraction efficiency.
Show PACS
85.60.Jb Light-emitting devices

Tunable optical gratings based on buckled nanoscale thin films on transparent elastomeric substrates

Cunjiang Yu, Kevin O’Brien, Yong-Hang Zhang, Hongbin Yu, and Hanqing Jiang

Appl. Phys. Lett. 96, 041111 (2010); http://dx.doi.org/10.1063/1.3298744 (3 pages) | Cited 13 times

Online Publication Date: 29 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
This letter reports a tunable optical grating based on buckled thin film with periodic sinusoidal patterns on a transparent elastomeric substrate. Submicron scale sinusoidal gratings have been fabricated with nanometer thick Gold/Palladium film coated on 30% pretensioned polydimethylsiloxane substrates. Due to competition between the soft elastomeric substrates and relatively stiff films, periodic wavy profiles are created upon releasing the pretension. The buckling profiles can be easily tuned by mechanically stretching or compressing. Optical transmittance diffraction testing has been conducted, and 85 nm peak wavelength shifts of the first order diffraction have been achieved by stretching the grating up to 30% of its original length.
Show PACS
42.79.Dj Gratings
42.79.Wc Optical coatings
81.40.Lm Deformation, plasticity, and creep
62.20.mq Buckling

Form birefringence metal and its plasmonic anisotropy

Liang Feng, Zhaowei Liu, Vitaliy Lomakin, and Yeshaiahu Fainman

Appl. Phys. Lett. 96, 041112 (2010); http://dx.doi.org/10.1063/1.3299002 (3 pages) | Cited 9 times

Online Publication Date: 29 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We constructed a uniaxial “form birefringence” metal that exhibits different dielectric polarizabilities along different optical axes as well as its supported optical anisotropy of surface plasmon polariton waves. The generated plasmonic index ellipsoid that exists in reciprocal space has been directly mapped and characterized in our experiment. The discovery of this anisotropic plasmonic metamaterial further completes analogy between artificial plasmonic metamaterials and conventional optical crystals, thereby providing opportunities to miniaturize myriad existing optical devices on-a-chip with plasmonics into nanometers scale.
Show PACS
42.25.Lc Birefringence
77.22.Ej Polarization and depolarization
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
42.70.-a Optical materials
back to top
RSS Feeds

Finite element analysis of ring-shaped emission profile in plasma bullet

Yukinori Sakiyama, David B. Graves, Julien Jarrige, and Mounir Laroussi

Appl. Phys. Lett. 96, 041501 (2010); http://dx.doi.org/10.1063/1.3298639 (3 pages) | Cited 23 times

Online Publication Date: 26 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Using a one-way coupled model of neutral gas flow and plasma dynamics we report a mechanism to explain the ring-shaped emission pattern that has been observed experimentally in plasma bullets at atmospheric pressure. We solve a fluid model with the local field approximation in one-dimensional cylindrical coordinates, corresponding to a cross-section of a plasma bullet. Pulselike uniform electric field is assumed to be applied perpendicular to the simulation domain. Time and spatially resolved spectroscopic measurements support the simulation results.
Show PACS
52.30.-q Plasma dynamics and flow
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.65.-y Plasma simulation
52.70.Kz Optical (ultraviolet, visible, infrared) measurements

A large gap of radio frequency dielectric barrier atmospheric pressure glow discharge

B. Li, Q. Chen, and Z. W. Liu

Appl. Phys. Lett. 96, 041502 (2010); http://dx.doi.org/10.1063/1.3299010 (3 pages) | Cited 9 times

Online Publication Date: 27 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A large gap was acquired between electrodes (up to 5.5 mm) of Ar atmospheric pressure glow discharge in radio frequency dielectric barrier discharge (rf-DBD). The discharge of Ar plasma was characterized by I-V curve and Lissajous plot, and the effective power of the discharge was calculated based on the measured Lissajous plot and found to be higher than 90% of the input power. To gain a thorough understanding of the mechanism, the rf-DBD with a single dielectric barrier layer operating in γ mode glow discharge of N2 plasma was diagnosed in spatial resolution through optical emission spectroscopy. It was concluded that secondary electron emission might be responsible for the sustainable glow discharge in the large gap rf-DBD plasma.
Show PACS
52.80.Pi High-frequency and RF discharges
52.80.Hc Glow; corona
52.25.Tx Emission, absorption, and scattering of particles
52.70.Ds Electric and magnetic measurements
52.70.Kz Optical (ultraviolet, visible, infrared) measurements

Experimental observation of the transition from nonlocal to local electron kinetics in inductively coupled plasmas

Hyo-Chang Lee, Min-Hyong Lee, and Chin-Wook Chung

Appl. Phys. Lett. 96, 041503 (2010); http://dx.doi.org/10.1063/1.3291038 (3 pages) | Cited 20 times

Online Publication Date: 28 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The transition from nonlocal to local kinetics was observed through the spatially resolved measurements of electron energy distribution functions in inductively coupled plasmas. As gas pressures increase, the spatial profiles of the effective electron temperatures (Teff) from the electron energy distribution functions changed dramatically from hollow shapes to flat shapes. With further increases in gas pressures, the Teff had saddle-shaped profiles with the highest Teff in the vicinity of an antenna coil. These changes in the radial profiles of the Teff show a transition of the electron kinetics from nonlocal to local regimes. This transition occurred when the electron energy relaxation lengths became smaller than the antenna half size.
Show PACS
52.25.-b Plasma properties
52.70.-m Plasma diagnostic techniques and instrumentation

Efficient generation and transportation of energetic electrons in a carbon nanotube array target

Yanling Ji, Gang Jiang, Weidong Wu, Chaoyang Wang, Yuqiu Gu, and Yongjian Tang

Appl. Phys. Lett. 96, 041504 (2010); http://dx.doi.org/10.1063/1.3298016 (3 pages) | Cited 6 times

Online Publication Date: 28 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Laser-driven energetic electron propagation in a carbon nanotube-array target is investigated using two-dimensional particle-in-cell simulations. Energetic electrons are efficiently generated when the array is irradiated by a short intense laser pulse. Confined and guided transportation of energetic electrons in the array is achieved by exploiting strong transient electromagnetic fields created at the wall surfaces of nanotubes. The underlying mechanisms are discussed in detail. Our investigation shows that the laser energy can be transferred more effectively to the target electrons in the array than that of in the flat foil due to the hole structures in the array.
Show PACS
79.70.+q Field emission, ionization, evaporation, and desorption
79.20.Ds Laser-beam impact phenomena

Plasma characterization using terahertz-wave-enhanced fluorescence

Jingle Liu and X.-C. Zhang

Appl. Phys. Lett. 96, 041505 (2010); http://dx.doi.org/10.1063/1.3291676 (3 pages) | Cited 6 times

Online Publication Date: 29 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We demonstrate that the terahertz-wave-enhanced fluorescence emission from excited atoms or molecules can be employed in the characterization of laser-induced gas plasmas. The electron relaxation time and plasma density were deduced through applying the electron impact excitation/ionization and electron-ion recombination processes to the measured time-dependent enhanced fluorescence. The electron collision dynamics of nitrogen plasma excited at different gas pressures and laser pulse energies have been systematically investigated. This plasma characterization method provides picosecond temporal resolution and enables omnidirectional optical signal collection.
Show PACS
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.20.Fs Electron collisions
back to top
RSS Feeds

Thermoreflectance dependence on Fermi surface electron number density perturbations

Patrick E. Hopkins

Appl. Phys. Lett. 96, 041901 (2010); http://dx.doi.org/10.1063/1.3292212 (3 pages) | Cited 1 time

Online Publication Date: 25 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The effects of an optical excitation on the thermoreflectance spectra of a solid are studied. A photonic excitation with sufficient energy will cause a perturbation in the electron number density around the Fermi surface. As the number density changes, so do the plasma frequency and carrier scattering rates, creating a change in the thermoreflectance response. Not accounting for the appropriate electron number density around the Fermi level after an optical excitation leads to an underestimate of electron scattering rates.
Show PACS
78.20.N- Thermo-optic effects
72.10.Fk Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect)
73.20.At Surface states, band structure, electron density of states
71.18.+y Fermi surface: calculations and measurements; effective mass, g factor

Defects analysis at the nanometric scale in Ca3Co4O9 thin films

R. Moubah, S. Colis, C. Ulhaq-Bouillet, and A. Dinia

Appl. Phys. Lett. 96, 041902 (2010); http://dx.doi.org/10.1063/1.3292590 (3 pages) | Cited 4 times

Online Publication Date: 25 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report on the nature and origin of structural defects at a nanometric scale in incommensurate Ca3Co4O9 thin films deposited by pulsed laser ablation on Al2O3(001) substrates. X-ray diffraction suggests that the deposited films have a well defined texture and that are free of spurious phases. However, cross section scanning high resolution transmission electron microscopy observations show the presence of regions with different kinds of stacking. Such regions present different chemical compositions from that of Ca3Co4O9 and are not detectable in diffraction mode. The local chemical analysis and the interplane distance measurement suggest that these defects correspond to the formation of the CaCo2O4 spurious phase. This phase has a similar structure and close lattice parameters with those of Ca3Co4O9. The origin of the formation of CaCo2O4 is discussed in terms of (i) strains due to the substrate which tend to suppress the incommensurability of the system, and (ii) local chemical nonstoichiometry.
Show PACS
68.55.-a Thin film structure and morphology
61.46.-w Structure of nanoscale materials
64.70.K- Solid-solid transitions
81.07.-b Nanoscale materials and structures: fabrication and characterization
81.16.Mk Laser-assisted deposition
81.15.Fg Pulsed laser ablation deposition
61.66.Bi Elemental solids
61.66.Dk Alloys

Influence of carbon content on the lattice variation, magnetic and electronic transport properties in Mn3SnCx

Yongchun Wen, Cong Wang, Man Nie, Ying Sun, Lihua Chu, and Cheng Dong

Appl. Phys. Lett. 96, 041903 (2010); http://dx.doi.org/10.1063/1.3295695 (3 pages) | Cited 10 times

Online Publication Date: 26 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The structural, magnetic, lattice, and electronic transport properties of Mn3SnCx compounds were investigated. Variation in carbon content from 0.6 to 1.2 does not change the crystal structure. With the increasing of x, the magnetic order changes from antiferromagnetic to ferromagnetic, and the transition temperature increases. The lattice constant shrinks around magnetic transition temperature when temperature increases. The total behavior of Mn3SnCx in temperature dependence of resistivity is very complex. For some Mn3SnCx, the temperature coefficient of resistivity is negative in the scope of magnetic order temperature. For other Mn3SnCx, the total behavior is metallic-type, and the resistivity appears an abrupt change.
Show PACS
61.66.-f Structure of specific crystalline solids
61.50.-f Structure of bulk crystals
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Mechanically tunable surface plasmon resonance based on gold nanoparticles and elastic membrane polydimethylsiloxane composite

Yu-Lun Chiang, Chih-Wei Chen, Chun-Hsiung Wang, Chun-Yi Hsieh, Yung-Ting Chen, Han-Yu Shih, and Yang-Fang Chen

Appl. Phys. Lett. 96, 041904 (2010); http://dx.doi.org/10.1063/1.3295702 (3 pages) | Cited 11 times

Online Publication Date: 26 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Surface plasmon in nanoscaled materials has recently attracted a great deal of attention due to its possibility in a wide range of application. From a practical standpoint, it is desirable for the devices having a tunability of surface plasmon frequency. To achieve this goal, in this study, a composite consisting of two-dimensional gold nanoparticles array embedded in elastic polydimethylsiloxane (PDMS) membrane has been synthesized. Because the elastic PDMS membrane has a high malleability, with an external stress, it is very easy to regulate the interparticle distance in the gold nanoparticle array. The change in the distance between each nanoparticle will alter the surface plasmon interaction, and hence surface plasmon frequency can be manipulated. It is found that when the interparticle distance increases, the enhanced surface plasma mutual coupling will cause the blueshift of surface plasmon resonance frequency. The observed result satisfies the forecast based on electromagnetic theory.
Show PACS
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
78.67.Bf Nanocrystals, nanoparticles, and nanoclusters
78.67.Hc Quantum dots
78.66.Sq Composite materials
78.40.Kc Metals, semimetals, and alloys

Elastic-strain distribution in metallic film-polymer substrate composites

G. Geandier, P.-O. Renault, E. Le Bourhis, Ph. Goudeau, D. Faurie, C. Le Bourlot, Ph. Djémia, O. Castelnau, and S. M. Chérif

Appl. Phys. Lett. 96, 041905 (2010); http://dx.doi.org/10.1063/1.3293450 (3 pages) | Cited 13 times

Online Publication Date: 26 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Synchrotron x-ray radiation was used for in situ strain measurements during uniaxial tests on polymer substrates coated by a metallic gold film 400 nm thick deposited without interlayer or surface treatment. X-ray diffraction allowed capturing both components elastic strains and determining how these were partitioned between the metallic film and the polymeric substrate. For strains below 0.8%, deformation is continuous through the metal-polymer interface while above, the onset of plasticity in the metallic film induces a shift between film and substrate elastic strains.
Show PACS
68.35.Gy Mechanical properties; surface strains
81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.D- Elasticity
62.20.F- Deformation and plasticity
81.40.Lm Deformation, plasticity, and creep
62.20.fq Plasticity and superplasticity

Acoustic metamaterial panels for sound attenuation in the 50–1000 Hz regime

Z. Yang, H. M. Dai, N. H. Chan, G. C. Ma, and Ping Sheng

Appl. Phys. Lett. 96, 041906 (2010); http://dx.doi.org/10.1063/1.3299007 (3 pages) | Cited 27 times

Online Publication Date: 26 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We show experimentally that thin membrane-type acoustic metamaterials can serve as a total reflection nodal surface at certain frequencies. The small decay length of the evanescent waves at these frequencies implies that several membrane panels can be stacked to achieve broad-frequency effectiveness. We report the realization of acoustic metamaterial panels with thickness ≤ 15 mm and weight ≤ 3 kg/m2 demonstrating 19.5 dB of internal sound transmission loss (STL) at around 200 Hz, and stacked panels with thickness ≤ 60 mm and weight ≤ 15 kg/m2 demonstrating an average STL of >40 dB over a broad range from 50 to 1000 Hz.
Show PACS
81.05.Xj Metamaterials for chiral, bianisotropic and other complex media
62.65.+k Acoustical properties of solids
43.20.Hq Velocity and attenuation of acoustic waves

Room temperature study of the optical switching of a spin crossover compound inside its thermal hysteresis loop

G. Gallé, D. Deldicque, J. Degert, Th. Forestier, J.-F. Létard, and E. Freysz

Appl. Phys. Lett. 96, 041907 (2010); http://dx.doi.org/10.1063/1.3294312 (3 pages) | Cited 8 times

Online Publication Date: 27 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We have studied the low-spin to high spin state phase transition induced by a single or a sequence of nanosecond laser pulses within the thermal hysteresis loop of the [Fe(NH2-trz)3](NO3)2-H2O spin crossover compound. We demonstrate that the final state that is photoinduced can be finely controlled by changing the central wavelength and the energy of the laser pulses. A simple model accounts for the observed phenomena and paves the way for the practical applications to optical data storage at room temperature of spin state transition compounds.
Show PACS
42.70.Mp Nonlinear optical crystals
42.79.Vb Optical storage systems, optical disks
42.65.Pc Optical bistability, multistability, and switching, including local field effects
78.20.N- Thermo-optic effects
42.70.Gi Light-sensitive materials

The electrostatic coupling of longitudinal optical phonon and plasmon in wurtzite InN thin films

Y.-M. Chang, S. C. Liou, C. H. Chen, H.-M. Lee, and S. Gwo

Appl. Phys. Lett. 96, 041908 (2010); http://dx.doi.org/10.1063/1.3299021 (3 pages) | Cited 1 time

Online Publication Date: 27 January 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We utilize coherent longitudinal optical phonon as an optical nanoprobe to investigate the plasmonic behavior of wurtzite c-plane InN thin films. The transition from the three-dimensional electron gas in InN bulk toward the two-dimensional electron gas in InN thin film is revealed via measuring the coupling strength of coherent A1(LO) phonon and plasmon coupling mode. The coupling strength diminishes as the film thickness reduces and finally vanishes at 3±1 nm. This phenomenon is ascribed to the detuning of the intersubband plasmon frequency above the A1(LO) frequency, which is originated from the electronic quantum confinement in InN thin films.
Show PACS
63.22.Dc Free films
71.45.Gm Exchange, correlation, dielectric and magnetic response functions, plasmons
63.20.kk Phonon interactions with other quasiparticles
68.55.jd Thickness
73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
Page 1 of 5 Pages Next Page | Jump to Page
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close