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29 Sep 2003

Volume 83, Issue 13, pp. 2503-2719

Issue Cover Spotlight Figure

Appl. Phys. Lett. 83, 2680 (2003); http://dx.doi.org/10.1063/1.1614845 (3 pages)

F. Nakajima, Y. Miyoshi, J. Motohisa, and T. Fukui
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Air-coupled acoustic imaging with zero-group-velocity Lamb modes

Stephen D. Holland and D. E. Chimenti

Appl. Phys. Lett. 83, 2704 (2003); http://dx.doi.org/10.1063/1.1613046 (3 pages) | Cited 20 times

Online Publication Date: 23 September 2003

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A Lamb wave resonance has been found that allows unusually efficient transmission of airborne sound waves through plates. This occurs at the zero-group-velocity point at the frequency minimum of the first-order symmetric (S1) Lamb mode. At this frequency, plane waves with a range of incident angles can couple between the air and the Lamb mode in the solid plate, dominating the spectrum of transmitted focused sound beams by 10 dB or more. We use this frequency for C-scan imaging, and demonstrate the detection of both a 3.2-mm-diameter buried flaw and a subwavelength thickness changes of .005λ (1%). © 2003 American Institute of Physics.
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43.60.Lq Acoustic imaging, displays, pattern recognition, feature extraction
43.35.Zc Use of ultrasonics in nondestructive testing, industrial processes, and industrial products
81.70.Cv Nondestructive testing: ultrasonic testing, photoacoustic testing
43.35.Pt Surface waves in solids and liquids

Enhanced dynamic response of the photoinduced nematic–isotropic transition in a polymer matrix

K. L. Sandhya, S. Krishna Prasad, and Geetha G. Nair

Appl. Phys. Lett. 83, 2707 (2003); http://dx.doi.org/10.1063/1.1614844 (3 pages) | Cited 5 times

Online Publication Date: 23 September 2003

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We have investigated the dynamic response of the photoinduced nematic–isotropic transition and the thermal back relaxation process of a liquid crystal with photoactive molecules embedded in a polymer matrix. The results show that the presence of the polymer matrix leads to a dramatic improvement in the response time. Possible causes for this finding have been discussed. © 2003 American Institute of Physics.
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64.70.M- Transitions in liquid crystals
42.70.Df Liquid crystals

Study of the cross-sectional profile in selective formation of porous silicon

Han-Su Kim, Kyuchul Chong, and Ya-Hong Xie

Appl. Phys. Lett. 83, 2710 (2003); http://dx.doi.org/10.1063/1.1613995 (3 pages) | Cited 3 times

Online Publication Date: 23 September 2003

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Porous Si is the semi-insulating state of Si, with low thermal expansion mismatch with bulk Si. As a result, it is an excellent material for crosstalk isolation in mixed-signal integrated circuits. We study the formation of isolated porous Si regions in p−-type and p+-type Si substrates with emphasis on the cross-sectional profile of the porous regions. Our study reveals that in addition to the primary undercut due to the isotropic nature of the anodization process, there exists a secondary undercut that is similar in shape to the bird’s beak commonly observed at the edge of field oxides in conventional Si complementary-metal-oxide-semiconductor process. The shape and the extent of the secondary undercut are dependent on the type of mask materials used during selective formation of porous Si as well as the substrate resistivity. The combined experimental and simulation studies pointed to two likely origins of secondary undercuts: the weak adhesion of some of the mask materials and current crowding in bulk Si substrates near the edge of the mask openings. Secondary undercuts result in the erosion of the precious Si chip surface area when a porous Si trench is used for rf crosstalk isolation, and should be minimized. © 2003 American Institute of Physics.
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81.05.Cy Elemental semiconductors
81.05.Rm Porous materials; granular materials
81.65.-b Surface treatments
85.40.-e Microelectronics: LSI, VLSI, ULSI; integrated circuit fabrication technology

Giant Goos-Hänchen effect at the reflection from left-handed metamaterials

Ilya V. Shadrivov, Alexander A. Zharov, and Yuri S. Kivshar

Appl. Phys. Lett. 83, 2713 (2003); http://dx.doi.org/10.1063/1.1615678 (3 pages) | Cited 86 times

Online Publication Date: 23 September 2003

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We study the beam reflection from a layered structure with a left-handed metamaterial. We predict a giant lateral (Goos-Hänchen) shift and splitting of the beam due to the resonant excitation of surface polaritons with a vortexlike energy flow between the right- and left-handed materials. © 2003 American Institute of Physics.
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78.68.+m Optical properties of surfaces
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
71.36.+c Polaritons (including photon-phonon and photon-magnon interactions)
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