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3 Oct 2005

Volume 87, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 87, 143902 (2005); http://dx.doi.org/10.1063/1.2077839 (3 pages)

Kaustubh D. Bhalerao, Edward Eteshola, Matthew Keener, and Stephen C. Lee
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Adaptation of flexible polymer fabrication to cellular mechanics study

Yi Zhao and Xin Zhang

Appl. Phys. Lett. 87, 144101 (2005); http://dx.doi.org/10.1063/1.2061861 (3 pages) | Cited 10 times

Online Publication Date: 26 September 2005

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Polymeric material has been utilized as mechanical sensors to measure microscopic cellular forces. Since many polymers are not readily compatible with conventional lithography, fabrication of numerous molds is inevitably a part of the process, compromising low cost and process simplicity. In this letter, we apply a flexible fabrication process to manufacture polymeric mechanical sensors with various aspect ratios from a single rigid mold. A proof-of-principle measurement was carried out in isolated cardiac myocytes. The results conform to the physiologic behavior. This approach has the potential for evaluation of mechanical interaction between various biological units and the substrates while minimizing the fabrication cost and complexity.
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87.15.La Mechanical properties
87.17.-d Cell processes
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
87.80.-y Biophysical techniques (research methods)

Surface enhanced infrared absorption by coupling phonon and plasma resonance

Mark S. Anderson

Appl. Phys. Lett. 87, 144102 (2005); http://dx.doi.org/10.1063/1.2077838 (3 pages) | Cited 9 times

Online Publication Date: 28 September 2005

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A gold and silicon carbide particle matrix is presented that concentrates light to its surface using a combination of phonon and plasmon resonance mechanisms. The enhanced infrared absorption spectrum of absorbed molecules is used to probe the coupled phonon and plasmon surface resonances. Sensitive molecular detection is achieved by measuring the enhanced infrared absorption or the frequency shift in the surface modes of the coated matrix. This work demonstrates that hybrid polariton resonance structures using metallic and polar dielectric materials are feasible for applications in near-field microscopy, nano-optical devices, and trace chemical sensing.
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73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
73.22.Lp Collective excitations
63.20.kk Phonon interactions with other quasiparticles
78.30.Hv Other nonmetallic inorganics
63.22.-m Phonons or vibrational states in low-dimensional structures and nanoscale materials
61.46.-w Structure of nanoscale materials

Smart membranes: A physical model for a circadian behavior

R. Rodríguez and V. M. Castaño

Appl. Phys. Lett. 87, 144103 (2005); http://dx.doi.org/10.1063/1.2084320 (3 pages)

Online Publication Date: 29 September 2005

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Synthetic “smart” membranes, able to adjust their pore sizes, from 1 to 50 μm, depending on the physical and/or chemical environment, are presented. Their oscillatory behavior, resembling that of many living systems, is accurately reproduced by a model based on the two competing phenomena in the membrane: elastic forces and steric interactions.
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87.16.D- Membranes, bilayers, and vesicles
87.10.-e General theory and mathematical aspects
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