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2 Feb 2009

Volume 94, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 94, 059901 (2009); http://dx.doi.org/10.1063/1.3086725 (3 pages)

Yuta Tsukada, Tsuyoshi Honma, and Takayuki Komatsu
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Formation and manipulation of two-dimensional arrays of micron-scale particles in microfluidic systems by surface acoustic waves

C. D. Wood, J. E. Cunningham, R. O’Rorke, C. Wälti, E. H. Linfield, A. G. Davies, and S. D. Evans

Appl. Phys. Lett. 94, 054101 (2009); http://dx.doi.org/10.1063/1.3076127 (3 pages) | Cited 13 times

Online Publication Date: 2 February 2009

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The two-dimensional concentration and manipulation of micron-scale particles by orthogonal, surface acoustic, standing waves is demonstrated. The particles are organized by liquid pressure waves in a microfluidic system over a piezoelectric substrate and form a uniform two-dimensional array with a spacing governed by the mechanical nodes of the two orthogonal, surface acoustic, standing waves. The nodal spacing can be controlled in each orthogonal direction independently by adjustment of the radio frequency applied to the separate acoustic wave transducers. This technique could be used to enhance the particle concentrations at sensing locations in DNA or protein array detectors.
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43.38.Rh Surface acoustic wave transducers

Photoacoustic guidance of high intensity focused ultrasound with selective optical contrasts and time-reversal

Arik R. Funke, Jean-François Aubry, Mathias Fink, Albert-Claude Boccara, and Emmanuel Bossy

Appl. Phys. Lett. 94, 054102 (2009); http://dx.doi.org/10.1063/1.3077018 (3 pages) | Cited 12 times

Online Publication Date: 3 February 2009

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The authors present a method of focusing high intensity ultrasound by time-reversing the photoacoustic response of an optically selective target in a nonselective background. The target’s photoacoustic response was isolated from the background by subtracting the photoacoustic waveforms obtained at different optical wavelengths and convolved with a continuous signal. It was found that the focus produced was comparable in quality to that obtained by delay-law beam-forming. The method holds the promise of allowing precise targeting of high intensity focused ultrasound on nonechogenic targets, in moving environments, independently of the presence of aberrating layers.
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43.35.-c Ultrasonics, quantum acoustics, and physical effects of sound
43.35.Ud Thermoacoustics, high temperature acoustics, photoacoustic effect

Experimental evidence of left handed transmission through arrays of ferromagnetic microwires

H. García-Miquel, J. Carbonell, V. E. Boria, and J. Sánchez-Dehesa

Appl. Phys. Lett. 94, 054103 (2009); http://dx.doi.org/10.1063/1.3079673 (3 pages) | Cited 12 times

Online Publication Date: 6 February 2009

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Experimental evidence of left-handed transmission is demonstrated through an array of ferromagnetic microwires. We used amorphous magnetic microwires to take advantage of both electric and magnetic responses locally generating a double negative medium at microwave frequencies, where the ferromagnetic resonance effects take place. The dilution of the responses of the ferromagnetic material provided by the organization of the microstructure in the form of an array provides a means of synthesizing a tailored response to electromagnetic radiation. Finally, transmission characteristics of the analyzed array can be tuned as a function of the applied external magnetic field.
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42.70.-a Optical materials
41.20.Jb Electromagnetic wave propagation; radiowave propagation
75.50.Kj Amorphous and quasicrystalline magnetic materials
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
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