Optical diffraction into thick slab waveguides: a finite-beam RCWA approach to solve extremely asymmetrical scattering-EAS in slanted holographic gratings

Silvia M. Pietralunga; Alessandro Geroldi; Mirko Serafini

doi:10.1117/12.918558

8 May 2012 Optical diffraction into thick slab waveguides: a finite-beam RCWA approach to solve extremely asymmetrical scattering-EAS in slanted holographic gratings

Silvia M. Pietralunga, Alessandro Geroldi, Mirko Serafini

Author Affiliations +

Proceedings Volume 8428, Micro-Optics 2012; 84280E (2012) https://doi.org/10.1117/12.918558
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

We have implemented a Finite-Beam Rigorous Coupled-Wave Approach (FB-RCWA) to solve for guided-optics propagation in the presence of holographic slanted Bragg gratings, embedded in the core of slab waveguides and operated in Extreme Asymmetrical Scattering (EAS) configuration. In EAS a resonance condition can be established, as proceeding from the design parameters. Diffraction efficiency can be evaluated as the ratio of the flux of diffracted power P1, on a suitably defined cross-section along the propagation of diffracted beam, and input power P0. By FBRCWA, no limitation in the depth of grating modulation is assumed. The first-order diffracted field in resonant Bragg condition propagates along the waveguide. EAS in thick waveguides operating in highly multimodal regime can be investigated, as well as macroscopic volumes and widely extended illuminated regions up to a few millimeters. In thick slabs, η > 90% is demonstrated, for input illuminated apertures of length L ≥ Lc, where Lc is the optimum coupling length. The effects of detuning from Bragg condition, both in distribution and amplitude of the diffracted field, are quantified. Diffraction efficiency, i.e. optical coupling, bandwidth is evaluated.

Citation Download Citation

Silvia M. Pietralunga, Alessandro Geroldi, and Mirko Serafini "Optical diffraction into thick slab waveguides: a finite-beam RCWA approach to solve extremely asymmetrical scattering-EAS in slanted holographic gratings", Proc. SPIE 8428, Micro-Optics 2012, 84280E (8 May 2012); https://doi.org/10.1117/12.918558

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KEYWORDS

Waveguides

Diffraction gratings

Diffraction

Wave propagation

Holography

Dielectrics

Scattering

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