The role of the excitation of guided waves propagating in a corrugated dielectric waveguide is discussed in view of the resonance anomalies in reflectivity. Narrow-wavelength filtering properties that are due to these sharp anomalies have been a topic of interest for some time, but a proper understanding of device performances requires an analysis of tolerances with respect to the incident-beam collimation and to waveguide losses. Such an analysis is proposed in this paper, and the conclusion is that the incident-beam divergence plays a critical role in reducing the maximum reflectivity for narrow-band filters.
© 2001 Optical Society of America
Evgeny Popov and Bozhan Bozhkov, "Corrugated waveguides as resonance optical filters-advantages and limitations," J. Opt. Soc. Am. A 18, 1758-1764 (2001)