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Experimental evidence for superprism phenomena in SOI photonic crystals

A. Lupu, E. Cassan, S. Laval, L. El Melhaoui, P. Lyan, and J. M. Fedeli

Open Access Open Access

Abstract

A first experimental demonstration of a planar superprism in silicon microphotonics technology using silicon on insulator (SOI) substrates is presented. Experimental results for anomalous wavelength-dependent angular dispersion in SOI triangular lattice planar photonic crystals are reported. An angular swing of 14° is measured for light propagating near the Γ-K direction as the input wavelength is changed from 1295 nm to 1330 nm, which corresponds to an angular dispersion of 0.4°/nm. For the Γ-M direction, a negative wavelength dispersion has been recorded. An opposite sign angular deviation of 21° is observed as the input wavelength is changed from 1316 nm to 1332 nm, i.e. a dispersion of 1.3°/nm.

©2004 Optical Society of America

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Figures (9)
Fig. 1.
Fig. 1. Scanning electron microscope photograph of an etched waveguide.

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Fig. 2.(a)
Fig. 2.(a) Optical microscope photograph of photonic crystal area with the set of input and output waveguides.

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Fig. 2.(b)
Fig. 2.(b) Scanning electron microscope view of the photonic crystal area.

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Fig. 3.(a)
Fig. 3.(a) IR vidicon camera photographs of the output light spots at different wavelengths for 30° input incidence angle.

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Fig. 3.(b)
Fig. 3.(b) IR vidicon camera photographs of the output light spots at different wavelengths for 45° input incidence angle.

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Fig. 4.
Fig. 4. Transmission spectra at 30° input angle for different output waveguides: (a) 21.0° output angle. (b) 24.5° output angle. (c) 28.0° output angle. (d) 31.5° output angle. (e) 35.0° output angle. (Transmission spectrum at 31.5° is also displayed on the graphs for the sake of comparison).

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Fig. 5.
Fig. 5. Transmission spectra at 45° input angle for different output waveguides: (a) 42.0° output angle. (b) 45.5° output angle. (c) 49.0° output angle. (d) 52.5° output angle. (e) 56.0° output angle. (f) 59.5° output angle. (g) 63.0° output angle. (Transmission spectrum at 56.0° is also displayed on the graphs for the sake of comparison).

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Fig. 6.(a).
Fig. 6.(a). Angular dispersion for 30° input angle.

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Fig. 6.(b).
Fig. 6.(b). Angular dispersion for 45° input angle.

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