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15 Oct 2012

Volume 101, Issue 16, Articles (16xxxx)

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Appl. Phys. Lett. 101, 161105 (2012); http://dx.doi.org/10.1063/1.4744947 (4 pages)

Nan Niu, Tsung-Li Liu, Igor Aharonovich, Kasey J. Russell, Alexander Woolf, Thomas C. Sadler, Haitham A. R. El-Ella, Menno J. Kappers, Rachel A. Oliver, and Evelyn L. Hu
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Opto-fluidic velocimetry using liquid crystal microfluidics

Anupam Sengupta, Stephan Herminghaus, and Christian Bahr

Appl. Phys. Lett. 101, 164101 (2012); http://dx.doi.org/10.1063/1.4760276 (4 pages) | Cited 2 times

Online Publication Date: 16 October 2012

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The coupling between flow and orientation of nematic liquid crystal molecules has been utilized to devise a non-intrusive opto-fluidic velocimetry technique on a microfluidic platform. The flow-induced reorientation of the liquid crystal molecules in a diverging channel possessing homeotropic surface anchoring produced distinct birefringent domains, directly observable through their interference colors, which are characteristic to the local flow velocity. The flow-induced effective birefringence was characterized using polarizing optical microscopy, confocal fluorescence polarizing microscopy, and particle tracking methods.
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47.80.Jk Flow visualization and imaging
42.70.Df Liquid crystals
47.57.Lj Flows of liquid crystals
61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order
78.15.+e Optical properties of fluid materials, supercritical fluids and liquid crystals
47.61.Fg Flows in micro-electromechanical systems (MEMS) and nano-electromechanical systems (NEMS)

Mobilities of O2+ and O2− ions in femtosecond laser filaments in air

Pavel Polynkin

Appl. Phys. Lett. 101, 164102 (2012); http://dx.doi.org/10.1063/1.4760280 (4 pages)

Online Publication Date: 17 October 2012

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The operation of the capacitive plasma probe commonly used for measurements of plasma density in laser filaments and sparks in gases is analyzed. The probe is employed to measure absolute mobilities of O2+ and O2− ions produced through femtosecond laser filamentation in air.
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52.25.Fi Transport properties
52.38.Hb Self-focussing, channeling, and filamentation in plasmas
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
51.50.+v Electrical properties (ionization, breakdown, electron and ion mobility, etc.)
42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation
42.65.Re Ultrafast processes; optical pulse generation and pulse compression

Void structure in silica glass with different fictive temperatures observed with positron annihilation lifetime spectroscopy

Madoka Ono, Kenta Hara, Masanori Fujinami, and Setsuro Ito

Appl. Phys. Lett. 101, 164103 (2012); http://dx.doi.org/10.1063/1.4761982 (4 pages)

Online Publication Date: 19 October 2012

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We examine voids in silica glasses with different fictive temperatures using positron annihilation lifetime spectroscopy. The pick-off annihilation lifetime of ortho-positronium increases with the fictive temperature, Tf, indicating that the void size increases. High Tf leads to high density and low degree of network polymerization so that increasing void size means that the density fluctuation of the silica glass increases with high Tf. Assuming that such density fluctuation causes light scattering, the previously reported Tf dependence of the Rayleigh scattering coefficient can be well explained by the change in void size.
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78.70.Bj Positron annihilation
61.43.Fs Glasses
82.35.-x Polymers: properties; reactions; polymerization
78.35.+c Brillouin and Rayleigh scattering; other light scattering
61.72.Qq Microscopic defects (voids, inclusions, etc.)
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