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Author notes These authors contributed equally: Romain Tirole, Stefano Vezzoli. Authors and Affiliations The Blackett Laboratory, Department of Physics, Imperial College London, London, UK Romain Tirole, Stefano Vezzoli, Iain Robertson, Dries Maurice, Stefan A. Maier, John B.
Abstract Implementing nonlinear optical components in nanoscale photonic devices is challenged by phase-matching conditions requiring thicknesses in the order of hundreds of wavelengths, and is disadvantaged by the short optical interaction depth of nanometre-scale materials and weak photon–photon interactions.
Abstract We have studied the nonlinear optical properties of single β-barium borate nanocrystals, with potential applications as probes in nonlinear sensing and imaging schemes. Our work demonstrates their ability to generate second, third, fourth, and fifth harmonics. The particles’ polarization response is studied and compared with simulations based on the bulk nonlinear tensors, with good agreement. Furthermore, the nonlinear susceptibilities of different orders are estimated.
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