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Design and Modeling for Integrated Photonics

Computer simulation of photonic components is a crucial step in the design process, because fabricating a large number of prototypes is prohibitively expensive and time-consuming. Our research efforts in modelling span a large class of photonic devices, like DFB and DBR laser diodes, gratings, resonant-cavity light-emitting diodes, vertical-cavity surface-emitting lasers and photonic crystal devices. For the modelling of DFB and DBR lasers, we developed longitudinal, multimode coupled wave equation based model CLADISS, which can be used for e.g. large signal static and time domain analysis as well as small signal AC and noise analysis of multisection lasers.

Transmission and reflection properties of 1D and 2D gratings are studied with RODIS, a tool based on rigorous coupled-wave analysis (RCWA).
For the design of resonant-cavity light-emitting diodes, we developed a model based on plane-wave expansion of a dipole source. This model can also deal with gratings incorporated in the cavity. We also perform research in the field of efficient eigenmode expansion methods, which led to the modelling tool CAMFR, capable of handling a large variety of optical devices and problems, like vertical-cavity surface-emitting lasers and photonic crystal devices.

Calculated field profile in an airpost VCSEL

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