JNCO-Grenoble 03/06/2007 Équipe nano-optique, DOPMD Applications de l’exaltation de l’effet électro- optique dans un cristal photonique en niobate de lithium induit par le ralentissement de la lumière M.-P. Bernal 1 , M. Roussey 1 , J. Amet 1 , F.I. Baida 1 , G.W. Burr 1,2 1 Institut FEMTO-ST, Département d’Optique, 16 Route de Gray, 25000 Besançon (France) 2 IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120 (USA)
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Applications de l’exaltation de l’effet électro- optique ...cmdo.cnrs.fr › IMG › pdf › Bernal_JNCO2007.pdf · PCs in lithium niobate • 2D photonic crystal on a lithium
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Summaryo Motivationo Device parameterso Defect fabrication studieso Optical characterisationo Theoretical study of the slow lighto Modulationo Superprisms in LNo Conclusions and perspectives
Lithium Lithium NiobateNiobate : a : a veryvery interestinginteresting dielectricdielectricmaterialmaterial for for thethe PC fabricationPC fabrication
LN PCs can reduce the size of classical modulators
LN PC devices open the path to multi-tunable devices since it is
We can observe on these theoretical transmission spectra that for a depth hole (cylinders) of 2.5µm, we obtain similar transmission profile than in the experimental results.
Δn (Classical Pockels)Geometry for largest superprism effect if the conventional Pockels effect is considered in order to calculate the induced modification on the refractive index; the TM polarization and the telecommunication wavelength (λ=1550nm) are considered in both scenarios.
At 1550 nm, for a modification of 1% of the effective refractiveIndex of LN the Δϑvg is about 10°. This corresponds to an external applied electric field of 150 V/μm
Δn: local field factorWe are looking for a geometry that allows beam steering keeping high local field factor
At 1550 nm, for a modification of 1%of the effective refractive index of LN the Δϑvg is about 7°.This corresponds to an external appliedelectric field of 0.5 V/μm.
J. Amet, M.-P. Bernal, D. Van Labeke, Journal of microscopy, To appear (2007)
• Fabrication of lithium niobate photonic crystals• Study of fabrication imperfections: delicate issue in PC fabrication on classical waveguides.• Experimental demonstration of a PC LN intensity modulator via an enhanced electro-optic effect (300 times bigger than classicalelectro-optic effect in LN!!).• Theoretical analysis show that this enhancement is due to slow light propagation.
Perspectives• Fabrication of high speed modulator > 40 GHz• Fabrication on performant PC superprism devices based on thecombination of ultrarefraction and slow light.