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20 Aug 2012

Volume 101, Issue 8, Articles (08xxxx)

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Appl. Phys. Lett. 101, 081102 (2012); http://dx.doi.org/10.1063/1.4745791 (3 pages)

M. K. Wu, M. Feng, and N. Holonyak, Jr.
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Single-shot quantitative dispersion phase microscopy

Niyom Lue, Jeon Woong Kang, Timothy R. Hillman, Ramachandra R. Dasari, and Zahid Yaqoob

Appl. Phys. Lett. 101, 084101 (2012); http://dx.doi.org/10.1063/1.4745785 (5 pages) | Cited 1 time

Online Publication Date: 20 August 2012

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We present an imaging modality capable of providing high-speed optical dispersion measurements of live cells. The technique permits wide-field measurement of the optical phase shifts introduced by a sample for multiple discrete wavelengths in a single image capture. Utilizing spatial modulation and the wavelength dependence of the interference-fringe spacing, average refractive index as a function of wavelength is obtained, yielding optical dispersion measurements of the sample under observation. Because of its simple and low-cost design, the technique can be readily integrated into a standard microscope to collect additional diagnostic information about biological cells.
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87.64.M- Optical microscopy
07.60.Hv Refractometers and reflectometers
07.60.Pb Conventional optical microscopes
42.79.-e Optical elements, devices, and systems
87.17.Uv Biotechnology of cell processes

Highly efficient generation of ultraintense high-energy ion beams using laser-induced cavity pressure acceleration

J. Badziak, S. Jabłoński, and P. Rączka

Appl. Phys. Lett. 101, 084102 (2012); http://dx.doi.org/10.1063/1.4746287 (4 pages)

Online Publication Date: 20 August 2012

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Results of particle-in-cell (PIC) simulations of fast ion generation in the recently proposed laser-induced cavity pressure acceleration (LICPA) scheme in which a picosecond circularly polarized laser pulse of intensity ∼1021 W/cm2 irradiates a carbon target placed in a cavity are presented. It is shown that due to circulation of the laser pulse in the cavity, the laser-ions energy conversion efficiency in the LICPA scheme is more than twice as high as that for the conventional (without a cavity) radiation pressure acceleration scheme and a quasi-monoenergetic carbon ion beam of the mean ion energy ∼0.5 GeV and the energy fluence ∼0.5 GJ/cm2 is produced with the efficiency ∼40%. The results of PIC simulations are found to be in fairly good agreement with the predictions of the generalized light-sail model.
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52.38.Kd Laser-plasma acceleration of electrons and ions
52.65.Rr Particle-in-cell method
52.25.Fi Transport properties
52.25.Os Emission, absorption, and scattering of electromagnetic radiation

Reduced acoustic cloaks based on temperature gradients

Victor M. García-Chocano, Daniel Torrent, and José Sánchez-Dehesa

Appl. Phys. Lett. 101, 084103 (2012); http://dx.doi.org/10.1063/1.4747197 (4 pages) | Cited 1 time

Online Publication Date: 22 August 2012

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This letter presents the design of a reduced acoustic cloak that uses a temperature gradient in order to obtain sound speeds larger than in air. The cloak consists of a circular acoustic crystal made of ten concentric layers of rigid cylinders whose surfaces are heated or cooled in order to get the temperature gradient needed for cloaking behavior. The total pressure field produced by the scattering of sound waves impinging this complex structure is computed and it is shown how acoustic waves are bent in a way similar to that predicted for perfect cloaking devices.
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43.20.Hq Velocity and attenuation of acoustic waves
43.20.Fn Scattering of acoustic waves

Enhancement of electrical conductivity of thick silver electrode using a tailored amorphous alloy

Sang Soo Jee, Se Yun Kim, Suk Jun Kim, Jin Man Park, Kyu Hyoung Lee, Jun Ho Lee, Keum Hwan Park, Jung Na Heo, Sang Mock Lee, In Taek Han, Ka Ram Lim, Won Tae Kim, Do Hyang Kim, and Eun-Sung Lee

Appl. Phys. Lett. 101, 084104 (2012); http://dx.doi.org/10.1063/1.4747216 (5 pages) | Cited 1 time

Online Publication Date: 22 August 2012

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Metallic glass (MG) can be a promising additive for the screen-printed silver electrode, when the composition of MG is properly tailored. When Cu-Zr-Al MG is used as an additive, the contact resistance between the Ag electrode and the Si emitter significantly decreases down to 5.39 mΩ cm2 on 100 Ω/sq of emitter, while when Cu-Zr Mg is used, the contact resistance is 31.28 mΩ cm2. Wider supercooled-liquid region and high reactivity with silver of Cu-Zr-Al MG lead to wider contact area of the Ag electrode and higher density of Ag crystallites, resulting in such a low contact resistance.
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73.40.Ns Metal-nonmetal contacts
73.40.Cg Contact resistance, contact potential

Nanostructured anatase-titanium dioxide based platform for application to microfluidics cholesterol biosensor

Md. Azahar Ali, Saurabh Srivastava, Pratima R. Solanki, Ved Varun Agrawal, Renu John, and Bansi D. Malhotra

Appl. Phys. Lett. 101, 084105 (2012); http://dx.doi.org/10.1063/1.4747714 (5 pages) | Cited 2 times

Online Publication Date: 22 August 2012

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We report results of studies relating to the fabrication of a microfluidics cholesterol sensor based on nanocrystalline anatase-titanium dioxide (ant-TiO2) film deposited onto indium tin oxide (ITO) glass. The results of response studies (optimized under the flow rate of 30 μl/min) conducted on cholesterol oxidase (ChOx) immobilized onto crystalline ant-TiO2 nanoparticles (∼27 nm)/ITO microfluidics electrode reveal linearity as 1.3 to 10.3 mM and improved sensitivity of 94.65 μA/mM/cm2. The observed low value of Km (0.14 mM) indicates high affinity of ChOx to cholesterol. No significant changes in current response of this microfluidics sensor are measured in the presence of different interferents.
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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
87.14.ej Enzymes
82.47.Rs Electrochemical sensors
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