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【正文】 ength optimisation to maximise device bandwidth Kallistos Ring resonator example ?The wavelength peaks are determined by the length around the ring ?insert variable straight length L between the two arcs ?The extinction ratio is determined by the coupler ?Vary the gap between the waveguides ?Set up optimisation example to tune resonator transmission to um and maximise the extinction ratio Kallistos Ring resonator example ?Define two independent variables ?Length will represent the length of waveguide between the arcs ?Gap will represent the edge to edge separation between the arms of the couplers Kallistos Ring resonator example ?Link the independent variables to the structure ?Commands can be found very easily by pressing the tab key Kallistos Ring resonator example ?Define an objective function ?In this example the wavelength is set to an FD calculation is performed the flux in the through and the drop arm is calculated the wavelength is set to um the calculation is repeated ?The objective is defined as the extinction ratio at the two wavelengths which is then to be maximised ?The resonator will be tuned to um and the free spectral range set to 40 nm Kallistos Ring resonator example ?Run the optimisation ?Using global optimisation ?Several peaks are found corresponding to different spectral orders Kallistos Ring resonator after optimisation ?Transmission at um ?Transmission at um Active FDTD Engine ? Model gain in FDTD simulation ? Includes a rateequation for carrier dynamics ? MultiLorentzian gain model (first ever in World) ? Userdefined “contacts” for currentinjection Applications: ? Photonic crystal lasers ? Nanocavity lasers Right: a Littrow mode of a photonic crystal laser simulated with CrystalWave. Conclusions ? OmniSim provides one of the easiest to use interfaces in the industry, with powerful features such as tilted etching and grading. ? Advanced fast FDTD engine boasts many Worldfirst technologies including subgridding and realistic gain materials
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