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Subwavelength grating (SWG) metamaterial waveguides and ring resonators on a silicon nitride platform are proposed and demonstrated. The SWG waveguide is engineered such that a large overlap of 53% of the Bloch mode with the top cladding material is achieved, demonstrating excellent potential for applications in evanescent field sensing and light amplification. The devices, which have critical dimensions...
We report the first integrated refractometric sensor capable of detecting atmospheric CO2 gas concentration levels. The sensor employs a microring resonator functionalized with a guanidine polymer and can detect CO2 concentrations down to 250ppm with a 25ppm resolution.
We have employed scanning force microscopy (SFM) and nanoindentation analysis to track the evolution of tribologically generated antiwear films derived from zinc dialkyldithiophosphate (ZDDP) as a function of rubbing time. The SFM images reveal that film morphology evolves with time through a growth mechanism consisting of three stages. In the first stage nucleation on active sites at the steel surface...
Zinc dialkydithiophosphate (ZDDP) materials are important antiwear/antioxidant additives in most modern lubrication formulations. The current understanding of the formation of antiwear films from ZDDP involves a tribochemical and thermooxidative component. We examine here the changes in the topography and structure of films formed by the thermooxidative decomposition of ZDDP in base oil. We probe...
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