In the pursuit of a hydrogen economy, extensive research has been directed at developing acidic and alkaline fuel cells. Such cells often utilize platinum-based catalysts. These materials have studied extensively in conditions but not ones. This focus on systems creates marked knowledge gap, since recent studies indicate that carbon-supported platinum (Pt/C) electrocatalysts degrade more rapidl...

We analyze phase matching with reference to frequency doubling in nanosized quadratic waveguides encompassing form birefringence and supporting cross-polarized fundamental and second-harmonic modes. In an AlGaAs rod with an air void, we show that phase-matched second-harmonic generation could be achieved in a wide spectral range employing state-of-the-art nanotechnology.