A two-dimensional-corrugated-slab-waveguide add/drop filter providing 100% resonant reflection at 1.55 µm wavelength for both TE and TM polarizations with identical FWHM is designed. The fabricated device exhibits a reflectivity spectrum of more than 95% peak reflection for both polarizations at 1.537 µm. The coupling scheme involves the TE_0 guided mode only; it is made relatively tolerant by means of a double-sided crossed grating.
© 2005 Optical Society of America
Tina Clausnitzer, Alexander V. Tishchenko, Ernst-Bernhard Kley, Hans-Jörg Fuchs, Detlef Schelle, Olivier Parriaux, and Ulrich Kroll, "Narrowband, polarization-independent free-space wave notch filter," J. Opt. Soc. Am. A 22, 2799-2803 (2005)