On the observation of dispersion in tunable second-order nonlinearities of silicon-rich nitride thin films
Journal Article - Open Access
University of California San Diego United States
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We present experimental results on second-harmonic generation in non-stoichiometric, silicon-rich nitride films. The as-deposited film presents a second-order nonlinear coefficient, or 2, as high as 8 pmV. This value can be widely tuned using the electric field induced second harmonic effect, and a maximum value of 22.7 pmV was achieved with this technique. We further illustrate that the second-order nonlinear coefficient exhibited by these films can be highly dispersive in nature and require further study and analysis to evaluate their viability for in-waveguide applications at telecommunication wavelengths.