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Nonlinear Photonic Crystals

Nonlinear optics enables us to control light by light. This is why it plays a key role in photonics – the science and technology to generate, transfer and process information by means of light. Quadratic optical nonlinearities are traditionally employed for frequency conversion, i.e., to generate new wavelengths (colours) from a laser beam, but they can also enable all-optical devices, which control and reshape an optical signal by means of another (change its path, modulate its intensity, switch it on and off, etc). Purely nonlinear photonic crystals and quasi-crystals, based on ad-hoc periodically poled structures in ferroelectric materials such as LiNbO3 or LiTaO3, provide a powerful tool to coherently control the nonlinear response. The nonlinear photonic crystals we are currently developing can enable tailoring new sources of multi-entangled photons [entanglement is the key ingredient for quantum cryptography and quantum communications] and multiwavelength coherent sources in monolithic and fibre-compatible device formats.


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Page responsible:Jerker Widengren
Belongs to: Quantum and Biophotonics
Last changed: Jan 23, 2019