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19 Dec 2011

Volume 99, Issue 25, Articles (25xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 99, 253701 (2011); http://dx.doi.org/10.1063/1.3666819 (3 pages)

Jun Huang, Hui Li, Wei Chen, Guo-Hua Lv, Xing-Quan Wang, Guo-Ping Zhang, Kostya Ostrikov, Peng-Ye Wang, and Si-Ze Yang
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Extraordinary sound tunneling through a barred horn via subwavelength hole resonance

Gaokun Yu and Xinlong Wang

Appl. Phys. Lett. 99, 254101 (2011); http://dx.doi.org/10.1063/1.3670326 (3 pages) | Cited 1 time

Online Publication Date: 19 December 2011

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Tuning the extraordinary acoustical transmission is shown to be practically feasible simply by controlling acoustical impedances induced by surface evanescent waves. We demonstrate this idea with an example of making a sound tunnel in an acoustical waveguide with a subwavelength short throat and a catenoid horn working below its cutoff frequency. The throat acting as a resonant aperture assists sound waves effectively tunneling through the normally barred horn, leading to resonant transmission of sound waves within an adjustable narrow band. The example may find its applications for highly efficient acoustical filters and transmitters.
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43.20.Ks Standing waves, resonance, normal modes

Bending kinetics of a photo-actuating nematic elastomer cantilever

N. Torras, K. E. Zinoviev, J. E. Marshall, E. M. Terentjev, and J. Esteve

Appl. Phys. Lett. 99, 254102 (2011); http://dx.doi.org/10.1063/1.3670502 (3 pages)

Online Publication Date: 19 December 2011

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Liquid crystal elastomers (LCE) containing embedded carbon nanotubes (CNTs) contract when exposed to light, due to LC disordering induced by the ability of CNTs to absorb light and convert it into thermal energy. A cantilever made of LCE-CNTs exposed to light demonstrates dynamic bending due to inhomogeneous strain distribution caused by exponential heat generation across the cantilever width. Analysis of bending dynamics helps to extract parameters that are important for designing actuators based on these materials. In this work, we have carried out direct measurements of temperature evolution inside the cantilever and related its kinetics to the applied irradiation power.
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81.40.Lm Deformation, plasticity, and creep
62.20.F- Deformation and plasticity
61.30.-v Liquid crystals
61.48.De Structure of carbon nanotubes, boron nanotubes, and other related systems
61.41.+e Polymers, elastomers, and plastics

Negative capacitor paves the way to ultra-broadband metamaterials

Silvio Hrabar, Igor Krois, Ivan Bonic, and Aleksandar Kiricenko

Appl. Phys. Lett. 99, 254103 (2011); http://dx.doi.org/10.1063/1.3671366 (4 pages) | Cited 6 times

Online Publication Date: 21 December 2011

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Experimental demonstration of the overcoming of basic dispersion-energy constraints in metamaterials with the help of active non-Foster negative capacitors is reported. The experimental metamaterial operates in RF regime, and it is based on air transmission line loaded with negative capacitors. Measurement results clearly show almost dispersionless Epsilon-Near-Zero behavior, accompanied with superluminal both phase and group velocities, over a bandwidth of more than four octaves (2 MHz-40 MHz). The principle of periodic loading of transmission line with negative capacitors may find applications in ultra-broadband active metamaterials for antennas and cloaking technology.
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84.40.Az Waveguides, transmission lines, striplines
84.32.Tt Capacitors
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