In this paper, we have proposed a tunable two dimensional (2D) photonic crystal (PhC) channel drop filter (CDF) using ring resonators with suitable quality factor (Q) and transmission efficiency; we investigate parameters which have an effect on resonant wavelength in this CDF, such as dielectric constant of inner, coupling, adjacent and whole rods of the structure. Dropping efficiency at the r...

We experimentally demonstrate a microelectromechanically (MEMS) tunable photonic ring resonator add-drop filter, fabricated in a simple silicon-on-insulator (SOI) based process. The device uses electrostatic parallel plate actuation to perturb the evanescent field of a silicon waveguide, and achieves a 530 pm resonance wavelength tuning, i.e., more than a fourfold improvement compared to previo...

We introduce a mechanism that provides an on/off switching capability in channel add-drop filter structures. These filters consist of two waveguides, a bus and a drop, coupled through a frequency-selective element. The switching functionality is achieved by incorporating materials with variable absorbing characteristics into the coupling element. When the variable material displays minimum abso...

Recommended Citation Sawvel, Russell. "Evaluation of shaker dust collector for use in a swine farrowing barn. ii To my beloved late Mother. iii ACKNOWLEDGMENTS I would like to thank my father Earl Sawvel and Sue Nordstrom for their support, guidance, and encouragement throughout this endeavor. I would also like to thank Tom Peters for being a world class advisor and Renée Anthony for being a wo...

Third-order add-drop filters based on series-coupled microring resonators were fabricated in silicon-rich silicon nitride with accurate dimensional control and negligible sidewall roughness. For the first time, a low 3 dB drop loss is demonstrated with a wide 24 nm free-spectral-range in a high-order microring filter without using the Vernier effect. The spectral response is matched by rigorous...

Laboratory studies have demonstrated degradation of electrostatically-enhanced (electret) respirator filter performance after exposure to excessive levels of ionizing radiation, immersion in solvents, and when exposed intermittently to specific aerosols. This study was conducted to determine if such degradation has practical significance in the workplace. N95, R or P95 and P100 filters from two...

PCR detection of Trypanosoma cruzi in Rhodnius prolixus using fresh tissue or fecal drops on filter paper showed comparable results: 38.7% infection rate using the fresh tissue sample and 37.9% by dried fecal drop.