Optical filter elements based on waveguide gratings

Robert Magnusson; Peter Wang

doi:10.1117/12.140393

2 March 1993 Optical filter elements based on waveguide gratings

Robert Magnusson, Peter Wang

Proceedings Volume 1732, Holographics International '92; (1993) https://doi.org/10.1117/12.140393
Event: Holographics International '92, 1992, London, United Kingdom

Abstract

The guided-mode resonance properties of planar dielectric waveguide gratings are presented and explained. It is shown that these structures function as filters producing efficient exchange of energy between forward and backward propagating diffracted waves with smooth lineshapes and arbitrary filter linewidths. Simple expressions based on classical slab waveguide theory give a clear view and quantification of the inherent TE/TM polarization separation and the free-spectral ranges of the filters. Furthermore, the resonance regimes, defining the parametric regions of the guided-mode resonances, can be directly visualized. It is shown that the linewidths of the resonances can be controlled by the grating modulation amplitude and by the degree of mode confinement (refractive-index difference at boundaries). Examples presented of potential uses for these elements include a narrow-line polarized laser, tunable polarized laser, photorefractive tunable filter, and an electro-optic switch. The guided-mode resonance filter represents a basic new optical element with significant potential for practical applications.

Citation Download Citation

Robert Magnusson and Peter Wang "Optical filter elements based on waveguide gratings", Proc. SPIE 1732, Holographics International '92, (2 March 1993); https://doi.org/10.1117/12.140393

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