We experimentally demonstrate enhanced self-phase modulation (SPM) in silicon nitride (Si3N4) waveguides integrated with 2D graphene oxide (GO) films. GO films are onto Si3N4 using a solution-based, transfer-free coating method that enables precise control of the film thickness. Detailed SPM measurements carried out both picosecond and femtosecond optical pulses. Owing to high Kerr nonlinearity...

The first demonstration of a nanoscaled titanium zirconium nitride (TiZrN2) single-phase isolated during the preparation polymer-derived silicon (Si3N4) matrix nanocomposites is discussed. We employed polysilazane, which was chemically modified with Zr[N(CH2CH3)2]4 and Ti[N(CH3)2]4 then ammonolyzed before pyrolysis step under ammonia (1000 °C) heat-treatment in flowing nitrogen (1000–1700 °C). ...

Gas sensing properties of metal oxide nanopowders (ZnO, TiO2, WO3, SnO2) with average diameters of 40-60 nm were analyzed by room-temperature photoluminescence spectroscopy. The influence of gas environment (O2, N2, H2, CO, CO2) on the emission intensity was investigated for metal oxide nanopowders with surface doped by impurities (Pt, Ag, Au, Sn, Ni or Cu). Established physicochemical regulari...

Integrated optics platforms offer the possibility to implement compact photonic devices for nonlinear optics applications. Modern nanofabrication facilities allow the fabrication of sub-micron-sized waveguide geometries that confine light to reach very high optical intensities. These intensities enable efficient nonlinear processes that are further enhanced by using materials with high nonlinea...

The process of synthesizing silica nanopowder by the gas phase thermal oxidation of tetraethylorthosilicate (TEOS) in a diffusion flame reactor was simulated using a commercial computational fluid dynamic (CFD) code. The fuel combustion process and silica particle formation and growth in the flame are modeled. The temperature, velocity and particle size distribution (PSD) fields inside the reac...

The paper presents an in-depth study of the bio-tribological performance on silicon nitride matrix ceramic composites containing hexagonal boron (hBN) with different content. Ultra-high molecular weight polyethylene (UHMWPE) under simulated body fluid lubrication, and fluid-lubricated sliding tests were performed a universal friction wear tester. results showed that incorporation hBN into reduc...

The authors report tribochemical changes due to sliding of a silicon nitride Si3N4 ball against an ultrananocrystalline diamond UNCD thin film. Unidirectional sliding wear measurements were conducted for 2000 cycles using a ball-on-disk apparatus with a 3/16 in. diameter Si3N4 ball at a sliding speed of 3.3 mm/s and a normal load of 98.0 mN nominal Hertzian stress of 0.6 GPa in a nitrogen envir...