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We demonstrate generation of few-cycle THz pulses through optical rectification in organic DAST crystals at telecommunication wavelength (1550 nm). An extremely high conversion efficiency is achieved through velocity-matching and the materialpsilas large nonlinear optical susceptibility.
We report a new methodological step leading to the self-sufficiency of the sphere method for the complete characterization of the optical properties of biaxial crystals. It relies on the study of the double refraction effect.
The effects of a sub-wavelength transition layer of negative index material on surface wave propagation are investigated. Dispersion relations at interfaces of linear and nonlinear dielectrics separated by this transition layer are derived and analyzed.
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