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A recent break-through in the domain of photonic integration is the use of sub-wavelength waveguide grating structures to engineer the refractive index of integrated components. These structures are an example of a case where a nanoscale simulation over the full device is not reliable and reliance must be placed on a simple design procedure. This paper reports a study of the homogenisation of sub-wavelength waveguide grating structures. It is shown how the properties these waveguides may be accurately modelled using simple design rules. A justification for these rules is found from the exact theory by a judicious choice of approximations. The temporal and spatial dispersive properties of the subwavelength grating waveguide are also evidenced.
Photonics Technology Laboratory, Centre for Research in Photonics, University of Ottawa, School of Electrical Eng. & Computer Sci., Advanced Research Complex, 25 Templeton St., Ottawa, ON K1N 6N5 Canada
Photonics Technology Laboratory, Centre for Research in Photonics, University of Ottawa, School of Electrical Eng. & Computer Sci., Advanced Research Complex, 25 Templeton St., Ottawa, ON K1N 6N5 Canada