Acousto-optically tunable lithium niobate photonic crystal

Courjal, Nadège; Benchabane, Sarah; Dahdah, Jean; Ulliac, Gwenn; Gruson, Yannick; Laude, Vincent
March 2010
Applied Physics Letters;3/29/2010, Vol. 96 Issue 13, p131103
Academic Journal
We report on an active two-dimensional lithium niobate photonic crystal (PhC) driven by stationary Rayleigh surface acoustic waves. The configuration relies on two interdigital transducers that modulate the refractive index through the acousto-optical effect. Highly efficient, compact acousto-optical PhCs with an active length of only 13 μm and a driving electrical power of 20 mW have been fabricated and characterized. Experiments show that an enhancement factor of the elasto-optical interaction of the order of 61 is obtained thanks to slow light effects in the PhC.


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