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30 Jun 2008

Volume 92, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 92, 264101 (2008); http://dx.doi.org/10.1063/1.2951485 (3 pages)

Wei Xiang Jiang, Tie Jun Cui, Qiang Cheng, Jessie Yao Chin, Xin Mi Yang, Ruopeng Liu, and David R. Smith
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Effect of gas pressure on ion flux in 2 MHz capacitive discharge

I. V. Schweigert

Appl. Phys. Lett. 92, 261501 (2008); http://dx.doi.org/10.1063/1.2955526 (3 pages) | Cited 3 times

Online Publication Date: 2 July 2008

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We have studied the ion energy and angular distribution functions in a 2 MHz capacitive discharge using combined particle in cell Monte Carlo collision simulations. We found that secondary electrons produced by ion bombardment from the electrodes make important contribution to the ionization at higher gas pressure. Calculations showed that the ion flux on the electrode is very sensitive to the plasma parameters. However, the ion angular distribution function weakly responds to a change of the gas pressure.
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52.77.Dq Plasma-based ion implantation and deposition
52.80.Pi High-frequency and RF discharges
52.65.Pp Monte Carlo methods
52.65.Rr Particle-in-cell method

Label free biosensor incorporating a replica-molded, vertically emitting distributed feedback laser

M. Lu, S. S. Choi, C. J. Wagner, J. G. Eden, and B. T. Cunningham

Appl. Phys. Lett. 92, 261502 (2008); http://dx.doi.org/10.1063/1.2913007 (3 pages) | Cited 15 times

Online Publication Date: 3 July 2008

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A label free biosensor based upon a vertically emitting distributed feedback (DFB) laser has been demonstrated. The DFB laser comprises a replica-molded, one-dimensional dielectric grating coated with laser dye-doped polymer as the gain medium. Adsorption of biomolecules onto the laser surface alters the DFB laser emission wavelength, thereby permitting the kinetic adsorption of a protein polymer monolayer or the specific binding of small molecules to be quantified. A bulk sensitivity of 16.6 nm per refractive index unit and the detection of a monolayer of the protein polymer poly(Lys, Phe) have been observed with this biosensor. The sensor represents a departure from conventional passive resonant optical sensors from the standpoint that the device actively generates its own narrowband high intensity output without stringent requirements on the coupling alignments, resulting in a simple, robust illumination and detection configuration.
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87.85.Ox Biomedical instrumentation and transducers, including micro-electro-mechanical systems (MEMS)
87.14.E- Proteins
42.55.Px Semiconductor lasers; laser diodes
42.79.Pw Imaging detectors and sensors
42.70.Jk Polymers and organics
87.15.N- Properties of solutions of macromolecules
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