Surface Polariton Resonances and Reflectance on a Bigrating.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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A first order perturbation theory for treatment of the diffraction of light with surface polariton resonances on a bigrating has previously been developed and implemented. A modification has since been developed to include simultaneous resonant coupling to four surface polaritons. This work implements the modification and compares the results against exact theory. Results for reflectance versus angle of incidence were obtained for a sinusoidal bigrating of silver with a period of 615.47 nm and an incident wavelength of 633.00 nm. The perturbation theory is found to be valid at off-normal incidence for grating height to period ratios of 0.024 and less.
- Electricity and Magnetism