Abstract

Novel filters based on the guided-mode resonance properties of planar, dielectric waveguide gratings have received some attention in the literature recently.^1–5 This type of diffractive optical element can couple externally propagating waves to waveguide modes resulting in complete energy exchange between forward and backward propagating lightwaves. This efficient interaction is achieved by using a waveguide grating with high spatial frequency such that only the zero orders propagate, with all higher diffraction order cut off. It is the purpose of this paper to present new optical filter designs that are based on guided-mode resonance effects in planar dielectric structures. With near-ideal reflection and transmission filters achievable, it is believed that these will find numerous applications in many fields such as laser design, optical sensing, and spectroscopy.

© 1994 IEEE