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anstmichaels / emopt

A suite of tools for optimizing the shape and topology of electromagnetic structures.
BSD 3-Clause "New" or "Revised" License
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how to reproduce neff values for the grating coupler example? #14

Closed joamatab closed 3 years ago

joamatab commented 4 years ago 
wavelength = 1.55
h_wg = 0.28
h_etch = 0.19
neff = 2.8548
neff_etched = 2.0879

is the top cladding air or oxide? what waveguide width do you assume?

anstmichaels commented 4 years ago

Hmm, good question. The neff should be calculated based on the same simulation parameters as are used in the optimization (waveguide thickness = 280 nm, top and bottom cladding = oxide).

As far as waveguide width goes, we assume that the grating is sufficiently wide that it can be modeled as silicon in 2D.