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AIP Advances

Robust and economical multi–sample, multi-wavelength UV/vis absorption and fluorescence detector for biological and chemical contamination
Peter J. Lu, Melanie M. Hoehl, James B. Macarthur, Peter A. Sims, Hongshen Ma, and Alexander H. Slocum

The authors present a multi-sample, multi–wavelength UV/visible absorption and fluorescence detector that can operate off batteries or solar panels, connect wirelessly, and interface with mobile phones or tablets for data analysis. The authors demonstrate that the device, self-contained and optimized for portability, can measure d-glucose concentrations as well as a commercial fluorescence plate reader.

AIP Advances 2, 032110 (2012)

 

Observation of intermediate bands in Eu³⁺ doped YPO₄ host: Li⁺ ion effect and blue to pink light emitter
Abdul Kareem Parchur, Amresh Ishawar Prasad, Shyam Bahadur Rai, Raghvendra Tewari, Ranjan Kumar Sahu, Gunadhor Singh Okram, Ram Asaray Singh, and Raghumani Singh Ningthoujam

Emission spectra of Li⁺ ion co-doped YPO₄:5Eu nanoparticles reveal the presence of intermediate/mid gap bands in YPO₄. X-ray photoelectron spectroscopy confirms the presence of Eu³⁺ and the emission intensity ratio of magnetic to electric dipole transitions of Eu³⁺ is found to be dependent upon the excitation wavelength. Nanoparticles dispersed in ethanol and polymer films show a strong blue color.

AIP Advances 2, 032119 (2012)

 

Giant field localization in 2–D photonic crystal cavities with defect resonances: Bringing nonlinear optics to the W/cm² level
Nadia Mattiucci, Mark J. Bloemer and Giuseppe D’Aguanno

Simulations of defect resonances in 2–D photonic crystal slabs reveal that very high intensity resonances can be achieved with simple designs. For the example of a chalcogenide glass (As₂S₃) photonic crystal cavity, the authors find that all-optical switching at telecommunication wavelengths can be obtained for input intensities ~W/cm².

AIP Advances 2, 032112 (2012)

 

Ab–initio calculations for a realistic sensor: A study of CO sensors based on nitrogen–rich carbon nanotubes
A. M. Souza, A. R. Rocha, A. Fazzio, and A. J. R. da Silva

Combining ab initio atomistic methods with Non-Equilibrium Green’s Function electronic transport calculations, the authors attempt to realistically simulate a nanoscopic gas sensor. Simulations of a specific case, the 4ND defect in CN_x nanotubes, produce a sensitive gas sensor for CO at room temperature.

AIP Advances 2, 032115 (2012)

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