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6 Apr 2009

Volume 94, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 94, 141901 (2009); http://dx.doi.org/10.1063/1.3111813 (3 pages)

G. S. Huang (黄高山), S. Kiravittaya, V. A. Bolaños Quiñones, F. Ding (丁飞), M. Benyoucef, A. Rastelli, Y. F. Mei (梅永丰), and O. G. Schmidt
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Effects of N2–CO polarization beating on femtosecond coherent anti-Stokes Raman scattering spectroscopy of N2

Sukesh Roy, Daniel Richardson, Paul J. Kinnius, Robert P. Lucht, and James R. Gord

Appl. Phys. Lett. 94, 144101 (2009); http://dx.doi.org/10.1063/1.3116087 (3 pages) | Cited 6 times

Online Publication Date: 6 April 2009

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The effects of broadband excitation employing femtosecond laser pulses on the coherent anti-Stokes Raman scattering (CARS) spectroscopy of N2 are investigated. We have previously demonstrated that the dephasing rate of the coherence, established by the impulsive excitation of N2 using femtosecond pump and Stokes beams, can be used for measuring gas-phase temperature in chemically reacting flows. The objective of the current work is to investigate the effects of polarization beating between N2 and CO on the measured gas-phase temperature using time-resolved femtosecond CARS spectroscopy of N2.
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78.30.-j Infrared and Raman spectra
78.47.D- Time resolved spectroscopy (>1 psec)

Time-resolved pump-probe experiments beyond the jitter limitations at FLASH

A. Azima, S. Düsterer, P. Radcliffe, H. Redlin, N. Stojanovic, W. Li, H. Schlarb, J. Feldhaus, D. Cubaynes, M. Meyer, J. Dardis, P. Hayden, P. Hough, V Richardson, E. T. Kennedy, et al.

Appl. Phys. Lett. 94, 144102 (2009); http://dx.doi.org/10.1063/1.3111789 (3 pages) | Cited 21 times

Online Publication Date: 7 April 2009

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Using a noninvasive, electro-optically based electron bunch arrival time measurement at FLASH (free electron laser in Hamburg) the temporal resolution of two-color pump-probe experiments has been significantly improved. The system determines the relative arrival time of the extended ultraviolet pulse of FLASH and an amplified Ti:sapphire femtosecond-laser pulse at the interaction region better than 90 fs rms. In a benchmarking pump-probe experiment using two-color above threshold ionization of noble gases, an enhancement in the timing resolution by a factor of 4 compared to the uncorrected data is obtained.
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42.65.Re Ultrafast processes; optical pulse generation and pulse compression
32.80.-t Photoionization and excitation

Liquid metal stretchable unbalanced loop antenna

Shi Cheng, Anders Rydberg, Klas Hjort, and Zhigang Wu

Appl. Phys. Lett. 94, 144103 (2009); http://dx.doi.org/10.1063/1.3114381 (3 pages) | Cited 20 times

Online Publication Date: 8 April 2009

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We present a 2.4 GHz unbalanced loop antenna that can be stretched along multiple dimensions simultaneously. It was realized by incorporating room temperature liquid metal alloy into microstructured channels in an elastic material. The demonstrated prototype exhibits a stretchability of up to 40% along two orthogonal orientations as well as foldability and twistability. Port impedance and radiation characteristics of the nonstretched and stretched antenna were studied numerically and experimentally. Measured results indicate a radiation efficiency of more than 80%.
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84.40.Ba Antennas: theory, components and accessories

Ratchet-induced anisotropic behavior of superparamagnetic microdroplet

Jihua Zhang, Zhongjun Cheng, Yongmei Zheng, and Lei Jiang

Appl. Phys. Lett. 94, 144104 (2009); http://dx.doi.org/10.1063/1.3103250 (3 pages) | Cited 12 times

Online Publication Date: 9 April 2009

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Microscale ratchet structured surfaces were coated with nanoparticles, which resulted in anisotropic behavior of superparamagnetic microdroplet by magnetic field actuation. This ratchet structure enables superparamagnetic microdroplets to generate the anisotropic behavior through the alternative external magnetic field. A tuning behavior was revealed by changing the height of ratchet, the numbers of superparamagnetic nanoparticles, and the size of microdroplets. It is significant to understand the wetting properties on superhydrophobic surfaces with anisotropic structure.
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75.50.Tt Fine-particle systems; nanocrystalline materials
75.50.Mm Magnetic liquids
68.08.Bc Wetting
75.30.Gw Magnetic anisotropy

Optical force enhanced by plasmon resonance allowing position-sensitive synthesis and immobilization of single Ag nanoparticles on glass surfaces

Tamitake Itoh, Vasudevanpillai Biju, Mitsuru Ishikawa, Syoji Ito, and Hiroshi Miyasaka

Appl. Phys. Lett. 94, 144105 (2009); http://dx.doi.org/10.1063/1.3106617 (3 pages) | Cited 5 times

Online Publication Date: 9 April 2009

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Focused laser light in an aqueous solution of silver nitrate and disodium citrate allowed the synthesis and immobilization of single Ag particles on a glass surface. The as-synthesized Ag particles were free from aggregation. Rayleigh scattering spectra of the Ag particles showed a plasmon resonance band at ∼ 490 nm. Analysis of the spectra revealed that the Ag particles have oblate-spindle shapes with ∼ 30 nm diameter. The polarizability of the Ag nanoparticles demonstrated that soon after the formation of the particles at the focal point, optical force repels them out of the focal point and immobilizes on the glass surface.
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81.16.-c Methods of micro- and nanofabrication and processing
78.67.Bf Nanocrystals, nanoparticles, and nanoclusters
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
73.22.Lp Collective excitations
78.68.+m Optical properties of surfaces
78.35.+c Brillouin and Rayleigh scattering; other light scattering

Development of a lead oxide photopatternable organic-inorganic film

Huilan Han, Alexander M. Sutherland, Frank Yaghmaie, and Cristina E. Davis

Appl. Phys. Lett. 94, 144106 (2009); http://dx.doi.org/10.1063/1.3109798 (3 pages) | Cited 2 times

Online Publication Date: 10 April 2009

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We have developed a simple method to synthesize organic-inorganic films containing a Pb(II) acrylate precursor in a silicon-methacrylate solution in the presence of a photoactive compound. Film deposition is achieved by simple spin coating, and the presence of a photoactive compound enables rapid polymerization when the film is subjected to UV irradiation. This creates a patternable film that acts as both an imaging layer and also as a functional metal-containing layer for the final device. We also investigated the chemical composition of the film by energy dispersive x-ray spectroscopy.
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68.55.A- Nucleation and growth
81.15.-z Methods of deposition of films and coatings; film growth and epitaxy
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
82.35.-x Polymers: properties; reactions; polymerization
82.80.Ej X-ray, Mössbauer, and other γ-ray spectroscopic analysis methods

Converging biconcave metallic lens by double-negative extraordinary transmission metamaterial

M. Navarro-Cía, M. Beruete, M. Sorolla, and I. Campillo

Appl. Phys. Lett. 94, 144107 (2009); http://dx.doi.org/10.1063/1.3118585 (3 pages) | Cited 4 times

Online Publication Date: 10 April 2009

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In this letter we present simulation and experimental results of a left-handed converging biconcave metallic lens made of stacked subwavelength hole arrays (SSHAs) working in the millimeter wave range with additional features of polarizer and frequency filter. The converging behavior of the biconcave metallic lens, in contrast with focusing biconvex dielectric lenses, comes as a result of the negative index of refraction that characterizes double-negative metamaterials made of SSHAs. The presented results may find application in the design of lenses and devices both in the microwave, infrared and optical ranges.
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42.15.Eq Optical system design
84.40.-x Radiowave and microwave (including millimeter wave) technology
42.70.-a Optical materials
42.79.Ci Filters, zone plates, and polarizers
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