Waveguide

A general waveguide. Serves a base class for e.g. Slab or Circ.

Member functions:

• core(): returns core material
• eps(Coord): returns permittivity at a certain coordinate.
• mu(Coord): return permeability at a certain coordinate.
• n(Coord): return refractive index at a certain coordinate.
• N(): returns number of modes in this waveguide. Is the number set by set_N().
• mode(int i): returns Mode with index i. Zero is the fundamental mode.
• calc(): calculates the modes in this waveguide.
• plot(): interactively plots the modes in this waveguide.
• plot_n(r_x)): lower level routine to plot the refractive index. r_x is range objects (e.g arange(x0, x1, dx)) specifying which interval to plot and with which resolution. x is the transverse direction. An extra named argument filename='outputname.formatextension' is supported. For pictures, a variety of formats are supported (gif, jpg, png, bmp, eps, ps, tiff, pdf, xbm, dib), where the suffix of the filename will determine the format to be used.
• plot_field(component, r_x)): lower level field plot routine. component is a function operating on a Field object specifying which field component to plot, e.g. lambda f : f.E2().real. r_x is a range object (e.g arange(x0, x1, dx)) specifying which interval to plot and with which resolution. x is the transverse direction. Note that the function also supports an additional named argument filename='outputname.formatextension'. For pictures, a variety of formats are supported (gif, jpg, png, bmp, eps, ps, tiff, pdf, xbm, dib), where the suffix of the filename will determine the format to be used. Other arguments are overlay_n (defaults to true) which overlays the index profile on the field plot, and contour (defaults to true) which uses contours to show the index profile rather than gray scale.

See section Slab, Circ.

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