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2 Apr 2012

Volume 100, Issue 14, Articles (14xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 100, 144101 (2012); http://dx.doi.org/10.1063/1.3697983 (4 pages)

H. Xu (徐涵), Wei Yu (余玮), M. Y. Yu (郁明阳), A. Y. Wong (黄燿煇), Z. M. Sheng (盛政明), M. Murakami (村上匡且), and J. Zhang (张杰)
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Production of high-density high-temperature plasma by collapsing small solid-density plasma shell with two ultra-intense laser pulses

H. Xu (徐涵), Wei Yu (余玮), M. Y. Yu (郁明阳), A. Y. Wong (黄燿煇), Z. M. Sheng (盛政明), M. Murakami (村上匡且), and J. Zhang (张杰)

Appl. Phys. Lett. 100, 144101 (2012); http://dx.doi.org/10.1063/1.3697983 (4 pages)

Online Publication Date: 2 April 2012

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Three-dimensional particle-in-cell simulations show that the anisotropic collapse of a plasma microshell by impact of two oppositely directed intense laser pulses can create at the center of the shell cavity a submicron-sized plasma of high density and temperature suitable for generating fusion neutrons.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.65.Rr Particle-in-cell method
52.25.-b Plasma properties

All-optical monitoring of acoustic waves guided by confined micro-fluidic layers

N. Chigarev, V. Tournat, and V. Gusev

Appl. Phys. Lett. 100, 144102 (2012); http://dx.doi.org/10.1063/1.3701576 (4 pages)

Online Publication Date: 5 April 2012

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The study of the elastic properties of liquid micro-layers is of importance in biology and in micro-technology. Generation of the ultrasonic waves by sub-nanosecond pump laser provides opportunities for non-contact and non-destructive evaluation of materials at spatial scales from micrometer to a few tens of micrometers. Here, we report on the application of this all-optical technique for the study of acoustic properties of liquid layers of micrometric thickness confined by two parallel solid plates.
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62.60.+v Acoustical properties of liquids
47.80.Jk Flow visualization and imaging

Omnidirectional broadband acoustic absorber based on metamaterials

Alfonso Climente, Daniel Torrent, and José Sánchez-Dehesa

Appl. Phys. Lett. 100, 144103 (2012); http://dx.doi.org/10.1063/1.3701611 (4 pages) | Cited 5 times

Online Publication Date: 6 April 2012

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We present the design, construction, and experimental characterization of the acoustic analogue of the so called photonic black-hole. The fabricated sample has cylindrical symmetry and consists of two parts, a shell that bends the sound towards the center and a core that dissipates its energy. The shell is made of a metamaterial that perfectly matches the acoustic impedance of air and behaves like a gradient index lens. The experimental data obtained in a multi-modal impedance chamber demonstrate that the proposed acoustic black-hole acts like an onmidirectional broadband absorber with strong absorbing efficiency.
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43.55.Ev Sound absorption properties of materials: theory and measurement of sound absorption coefficients; acoustic impedance and admittance
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