Inverse design of waveguide crossing

Using parametric optimization (PO), and python interoperability design a silicon-on-insulator waveguide crossing in varFDTD 2.5D and 3D FDTD to rapidly converge on a solution.  This optimization algorithm is based on the adjoint method, and yields optimal solution in just a few iterations compared to other schemes such as particle swarm Więcej…

Inverse design of y-branch

Use the built-in parametric optimization (PO) method for inverse design of a silicon-on-insulator Y-branch to achieve the maximum broadband transmission. The varFDTD 2.5D solver now supports this technique allowing for realistic material models and monolithic planar devices. The adjoint method is the basis for the efficient optimization algorithm which significantly Więcej…

Y branch optimization using particle swarm algorithm

Component optimization is a key step of any design process striving to develop high-performance photonic devices. This silicon on insulator Y-branch example demonstrates a general component shape parametrization method that is suitable for an arbitrary optimization routine. The algorithm in this example is Lumerical’s built in particle swarm optimization (PSO) Więcej…

Resonant bio-sensor grating

We will calculate the reflectivity of a simple dielectric grating described in Cunningham et al.  This grating is designed to create a narrow resonant reflectivity line that can be used in biosensor applications. Simulation setup The grating is made from a thin layer (120 nm) of Silicon Nitride deposited on Więcej…

Diffraction grating

This example characterizes a diffraction grating in response to a broadband planewave at normal incidence. Lumerical provides a set of grating scripts as well as “grating order transmission” analysis group, making it easy to calculate common results such as number of grating orders, diffraction angles and grating efficiencies at different Więcej…

Blazed grating

This example shows how to calculate the grating orders from a blaze grating. This grating has many grating orders at each wavelength. In order to capture the signature of the total reflection and transmission, more frequency points in the monitors are required. Simulation setup A blaze grating is shown in Więcej…