Departmental Seminar

Nonlinear quantum optics in lithium niobate photonic crystals

Mr Sina Saravi
Friedrich-Schiller-Universit├Ąt Jena, Germany

It is known that the efficiency of nonlinear interactions can be greatly enhanced by slowing down the group velocity of the modes in photonic crystals waveguides (PCWs). In this talk, I will show, that PCWs have far more functionalities to offer for nonlinear interactions, especially in reaching novel phase-matching configurations and photon-pair-state engineering, which are not feasible to reach in other standard guiding structures. I will illustrate, with realistic designs in lithium niobate, how backward second harmonic generation (SHG), counter-propagating photon-pairs, and spatially entangled Bell states can be reached without the need for periodic poling, by using the unique properties of Bloch modes. Nano-structuring technology of lithium niobate in the recent years has been developed in our group and we have already successfully characterized SHG in lithium niobate ridge waveguides, which I will also show in my talk. Finally, I will show our work on the effect of loss on the efficiency of slow-light-enhanced nonlinear effects.

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