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16 May 2011

Volume 98, Issue 20, Articles (20xxxx)

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Appl. Phys. Lett. 98, 201101 (2011); http://dx.doi.org/10.1063/1.3590716 (3 pages)

Martynas Beresna, Mindaugas Gecevičius, Peter G. Kazansky, and Titas Gertus
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Shrinking an arbitrary object as one desires using metamaterials

Wei Xiang Jiang, Tie Jun Cui, Xin Mi Yang, Hui Feng Ma, and Qiang Cheng

Appl. Phys. Lett. 98, 204101 (2011); http://dx.doi.org/10.1063/1.3590203 (3 pages) | Cited 2 times

Online Publication Date: 16 May 2011

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Based on transformation optics, we present a shrinking device, which can transform an arbitrary object virtually into a small-size object with different material parameters as one desires. Such an illusion device will confuse the detectors or the viewers, and hence the real size and material parameters of the enclosed object cannot be perceived. We fabricated and measured a shrinking device by using metamaterials, which works at the nonresonant frequency and has low loss. The device has been validated by both numerical simulations and experiments on circular and square objects. Good shrinking performance has been demonstrated.
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42.70.-a Optical materials
42.79.-e Optical elements, devices, and systems
42.82.Cr Fabrication techniques; lithography, pattern transfer

Wave mixing in nonlinear magnetic metacrystal

Da Huang, Alec Rose, Ekaterina Poutrina, Stéphane Larouche, and David R. Smith

Appl. Phys. Lett. 98, 204102 (2011); http://dx.doi.org/10.1063/1.3592574 (3 pages) | Cited 5 times

Online Publication Date: 17 May 2011

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We present experimental measurements of three- and four-wave mixing phenomena in an artificially structured nonlinear magnetic metacrystal at microwave frequencies. The sum frequency generation signal for the varactor-loaded split-ring resonator (VLSRR) metamaterial agrees quantitatively with that predicted using an analytical effective medium model describing the VLSRR medium. A resonant enhancement of the nonlinear response is observed near the metamaterial resonance.
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42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
42.70.Nq Other nonlinear optical materials; photorefractive and semiconductor materials

High-sensitivity and wide-directivity ultrasound detection using high Q polymer microring resonators

Tao Ling, Sung-Liang Chen, and L. Jay Guo

Appl. Phys. Lett. 98, 204103 (2011); http://dx.doi.org/10.1063/1.3589971 (3 pages) | Cited 3 times

Online Publication Date: 17 May 2011

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Small size ultrahigh Q polymer microrings working at near visible wavelength have been experimentally demonstrated as ultralow noise ultrasound detectors with wide directivity at high frequencies (>20 MHz). By combining a resist reflow and a low bias continuous etching and passivation process in mold fabrication, imprinted polymer microrings with drastically improved sidewall smoothness were obtained. An ultralow noise-equivalent pressure of 21.4 Pa over 1–75 MHz range has been achieved using a fabricated detector of 60 μm diameter. The device’s wide acceptance angle with high sensitivity considerably benefits ultrasound-related imaging.
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85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
07.10.Cm Micromechanical devices and systems
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
81.65.Rv Passivation
43.38.-p Transduction; acoustical devices for the generation and reproduction of sound

Do droplets always move following the wettability gradient?

Jun Wu, Ruiyuan Ma, Zuankai Wang, and Shuhuai Yao

Appl. Phys. Lett. 98, 204104 (2011); http://dx.doi.org/10.1063/1.3592997 (3 pages) | Cited 2 times

Online Publication Date: 19 May 2011

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Impacting droplets on rough surfaces with a wettability gradient have been reported to rebound obliquely or migrate following the wettability gradient due to the unbalanced interfacial forces created by such heterogeneous architectures. Here we demonstrate under certain conditions, droplets can be self-propelled against the wettability gradient. We show that the local Cassie-to-Wenzel transition in the droplet is critical for such a counter-intuitive phenomenon. We believe that our letter extends our conventional understanding of wettability dynamics to heterogeneous surfaces and provides important insight for the design of micro/nanotextured surfaces for controlled droplet manipulation.
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47.55.dr Interactions with surfaces
68.08.Bc Wetting

Experimental verification of the bending of electromagnetic waves using metamaterials

Xiao-Yang He, Chun Yang, Biao Li, Qi Chen, Bang-Hua Zhou, and Chuan-Xiang Tang

Appl. Phys. Lett. 98, 204105 (2011); http://dx.doi.org/10.1063/1.3593000 (3 pages)

Online Publication Date: 20 May 2011

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In this study, the bending of electromagnetic waves using metamaterials in free space was demonstrated. The optical transformation approach was utilized to design the bend, and the required metamaterials are inhomogeneous and anisotropic. The corresponding parameter-reduced metamaterials were realized using nonresonant cut-wire structures, which worked over an ultrabroad bandwidth with uniform permittivities and permeabilities. A microwave horn antenna focused the electromagnetic wave into the bend. The radiation patterns of the horn with and without bend were compared. The experimental and full-wave simulation results showed that the electromagnetic waves were bent in the desired direction.
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42.70.-a Optical materials
42.79.Gn Optical waveguides and couplers
84.40.Ba Antennas: theory, components and accessories

Self-organization of core-shell and core-shell-corona structures in small liquid droplets

R. P. Shi, Y. Wang, C. P. Wang, and X. J. Liu

Appl. Phys. Lett. 98, 204106 (2011); http://dx.doi.org/10.1063/1.3591157 (3 pages)

Online Publication Date: 20 May 2011

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It was recently discovered that core-shell and core-shell-corona microstructures in immiscible liquid alloys, which were previously obtained only in outer space, can be fabricated under gravity condition on earth using conventional gas atomization. The origin was attributed solely to Marangoni motion driven by temperature-dependence of interfacial energy. We found in this letter, with the aid of computer simulation, that coupled processes of spinodal decomposition, decomposition-induced fluid flow, collision and collision-induced-collision among second-phase droplets all play critical rules at different stages in the formation of these structures. Their contributions relative to the Marangoni effect are analyzed as function of system size.
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64.75.Bc Solubility
68.03.Cd Surface tension and related phenomena
64.75.Yz Self-assembly
47.55.db Drop and bubble formation
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