We simulated both designs using the Active FDTD Engine with the Static Gain model, with a grid of 20nm and a duration of 7ps the steady-state was reached after 2ps. The six other defects are shown with red crosses Simulation results: single cavity Top view of the cavity array device: there is a lattice defect in Section of the single cavity device, taken along the centre of the structure Single-defect structure, we find a resonant wavelength of 1.25μm.
We create resonant cavities in the membrane by removing single holes the resonant frequencies can be determined using a standard FDTD calculation without the gain present. Material (InP) the membrane is 280nm thick and surrounded by air on both sides. The photonic crystal is etched in a thin membrane of active As we will show below, the array ofĭefects will allow us to obtain a higher laser output and a better defined farfield.
The vertices and in the centre of an hexagon. Larger cavity formed by a combination of seven lattice defects placed at We consider two designs: a cavity formed by a single lattice defect, and a We used CrystalWave to reproduce the results given in įor various geometries of photonic crystal laser cavities. Modelling a photonic crystal laser cavity User can simply define the gain function as a sum of Lorentzian functions whose amplitude, position and width Model in which the gain is a function of intensity. The Static Gain model, which does not explicitly consider a carrier density in the device but rather uses a saturable gain This model accounts for current injection, spontaneous and stimulated recombination rates.įor this model the user needs to provide gain curves (either fromĮxperiment or simulated using e.g. The Dynamic Gain model, in which the gain The Active FDTD module supports two different gain models: The simulation includes a dynamic carrier model. Littrow lasing simulated in a photonic crystal with a cavity formed byĪnd electrically pumped. Photonic crystal laser cavity simulated in CrystalWave. Picture below the field profile distribution of a Littrow mode inside a It can be used to model laser geometries that could not be simulated Model photonic crystal lasers (PC lasers) and other nano-cavity lasers realistically.
FDTD PHOTONIC CRYSTAL SOFTWARE
Photonic Crystal Lasers Simulation of photonic crystal lasers with CrystalWave's Active FDTD software
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