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9 Jun 2008

Volume 92, Issue 23, Articles (23xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 92, 231901 (2008); http://dx.doi.org/10.1063/1.2938921 (3 pages)

N. A. Mara, D. Bhattacharyya, P. Dickerson, R. G. Hoagland, and A. Misra
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Dispersion of an optodynamic wave during its multiple transitions in a rod

T. Požar, R. Petkovšek, and J. Možina

Appl. Phys. Lett. 92, 234101 (2008); http://dx.doi.org/10.1063/1.2944259 (3 pages) | Cited 4 times

Online Publication Date: 12 June 2008

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A rod acquires linear momentum during a short-laser-pulse ablation of its front face. Initially, this momentum is localized within the propagating laser-induced mechanical pulse—the optodynamic wave—while later it is gradually transferred to the uniform motion of the entire rod. Among other effects, the dispersion of the optodynamic wave due to lateral inertia plays an important role in the linear-momentum transformation mechanism. We observed the dispersion using interferometric measurements of the rod’s rear-end staircaselike displacement. The displacements calculated using an analytical solution of Love’s equation for a laser-ablated free-free homogeneous rod agree well with our measured data.
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61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
62.30.+d Mechanical and elastic waves; vibrations
46.40.Cd Mechanical wave propagation (including diffraction, scattering, and dispersion)

Standoff photoacoustic spectroscopy

C. W. Van Neste, L. R. Senesac, and T. Thundat

Appl. Phys. Lett. 92, 234102 (2008); http://dx.doi.org/10.1063/1.2945288 (3 pages) | Cited 17 times

Online Publication Date: 12 June 2008

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Here, we demonstrate a variation of photoacoustic spectroscopy that can be used for obtaining spectroscopic information of surface adsorbed chemicals in a standoff fashion. Pulsed light scattered from a target excites an acoustic resonator and the variation of the resonance amplitude as a function of illumination wavelength yields a representation of the absorption spectrum of the target. We report sensitive and selective detection of surface adsorbed compounds such as tributyl phosphate and residues of explosives such as trinitrotoluene at standoff distances ranging from 0.5–20 m, with a detection limit on the order of 100 ng/cm2.
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43.58.Kr Spectrum and frequency analyzers and filters; acoustical and electrical oscillographs; photoacoustic spectrometers; acoustical delay lines and resonators
82.80.Kq Energy-conversion spectro-analytical methods (e.g., photoacoustic, photothermal, and optogalvanic spectroscopic methods)
78.20.hb Piezo-optical, elasto-optical, acousto-optical, and photoelastic effects
62.65.+k Acoustical properties of solids
68.43.-h Chemisorption/physisorption: adsorbates on surfaces

Hydrogen plasma and atomic oxygen treatments of diamond: Chemical versus morphological effects

Z. Shpilman, I. Gouzman, E. Grossman, R. Akhvlediani, and A. Hoffman

Appl. Phys. Lett. 92, 234103 (2008); http://dx.doi.org/10.1063/1.2939561 (3 pages) | Cited 3 times

Online Publication Date: 13 June 2008

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Chemical bonding and morphology of chemical vapor deposited diamond films were studied using high resolution electron energy loss spectroscopy and atomic force microscopy, following hydrogen plasma and atomic oxygen exposures. The hydrogen plasma exposure resulted in preferential etching of nondiamond carbon phases, selective etching of diamond facets, and termination of the diamond surfaces by sp3-C–H species. Exposure to atomic oxygen, on the other hand, produced significant chemical changes resulting in oxidized hydrocarbon ill defined top layer, while the morphology of the surface remained almost unchanged.
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68.55.J- Morphology of films
79.20.Uv Electron energy loss spectroscopy
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)
68.37.Ps Atomic force microscopy (AFM)
81.65.Cf Surface cleaning, etching, patterning
52.77.-j Plasma applications
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