We present LEDs and asymmetric waveguide structures with embedded nanostripes and semipolar {101̄1} quantum wells. All samples are based on c-plane GaN/AlGaN templates grown heteroepitaxially on c-plane sapphire substrates by metal organic vapour phase epitaxy. The nanostripes have a periodicity of 250 nm and were achieved by selective area epitaxy with dielectric growth masks structured on full...

Optical bistability is reported in InP/GaInAsP equilateral-triangle-resonator (ETR) microlasers, which are fabricated by planar technology. For a 30 mum side ETR microlaser with a 2-mum-wide output waveguide connected to one of the vertices of the ETR, hysteresis loops are observed for the output power versus the injection current from 215 to 235 K. The laser output spectra are measured in the ...

Using a newly proposed augmented low-index-guiding scheme with silicon nitride/silicon dual-core waveguide, we have designed, fabricated, and characterized a transverse electric (TE) to transverse magnetic (TM) and TM-to-TE compact polarization rotator. The polarization rotation is realized in an asymmetric directional coupler. The measured peak conversion efficiencies for the TE-to-TM and TM-t...

Phase-space analysis has been widely used in the past for study of optical resonant systems. While it is usually employed to analyze far-field behaviour systems we focus here on its applicability coupling problems. By looking at phase-space description both mode and exciting source possible understand mechanisms as well gain insights approximate with reduced computational efforts. In this work ...

In two-dimensional 2D photonic crystals PC’s , we demonstrate compact optical waveguide isolators in which light can propagate only one way. Waveguides are composed of magneto-optical materials with magnetic domain walls. Magneto-optical effects and magnetic domain walls break time-reversal and spaceinversion symmetries, respectively, leading to nonreciprocal waveguides with different group vel...

A metallic coupler is proposed to interface a silicon on insulator (SOI) waveguide with a narrow hybrid plasmonic waveguide (200× 200 nm). The device operation is investigated and optimized to attain the best tradeoff between the mode confinement and the propagation loss. Calculations reveal that a high confinement and low loss of the energy is achieved from a silicon slab waveguide into the di...

Rectangular waveguide is one of the earliest types of transmission lines. Rectangular waveguide can be produced by hot extrusion process. In this paper, the hot extrusion process of CuZn5 rectangular waveguide was investigated by Finite Element Method (FEM). In addition, Genetic Algorithm (GA) was used to optimize the die geometry and process conditions to achieve the lowest magnitude of extrus...