Passive photonic crystals have been shown to exhibit a multitude of interesting phenomena, including slow-light propagation in line-defect waveguides. It was suggested that by incorporating an active material in the waveguide, slow light could be used to enhance the effective gain of the material, which would have interesting application prospects, for example enabling ultra-compact optical amp...

Room-temperature continuous-wave ~cw! operation is demonstrated with InGaN multiple-quantum-well laser diodes containing an asymmetric waveguide structure. Pulsed threshold current densities as low as 5.2 kA/cm have been obtained for ridge-waveguide laser diodes grown on sapphire substrates by metal-organic chemical vapor deposition. For improved thermal management, the sapphire substrate was t...

The current paper presents a six-port low-loss waveguide coupler based on ridge gap structure with potential application in various mmWave wireless systems. challenges the fabrication faced frequencies can be overcome by using technology. excitation of presented junction is done standard WR-28 flanges at bottom. performance proposed confirmed and measurement. measured results show that operates...

A micromachined ridge gap waveguide power divider operating at 220–325 GHz is presented. The device fabricated by SUEX dry film photoresist. Dry photoresist can be used to obtain geometrical features with high accuracy using a robust fabrication process. designed has simple and wide band performance. measured transmission coefficients are equal −3.5 ± 0.4 dB the input reflection coefficient bel...

The characteristics of dielectric backed planar conducting layers of arbitrarily shaped in a rectangular waveguide are calculated by means of coupled integral equation technique (CIET) which accurately takes higher order mode interactions. Equivalent structures for the accurate analysis whole structure are introduced in which magnetic surface currents are identified as the unknowns at the apert...