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arXiv 1808.07587physics.optics
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富硅氮化物薄膜可调二阶非线性色散的观测

On observation of dispersion in tunable second-order nonlinearities of silicon-rich nitride thin films

Hung-Hsi Lin, Rajat Sharma, Alex Friedman, Benjamin M. Cromey, Felipe Vallini, Matthew W. Puckett, Khanh Kieu, Yeshaiahu Fainman

摘要:

我们目前的实验结果在非化学计量,富硅氮化物(SRN)薄膜的二次谐波产生。沉积态薄膜的二阶非线性系数\c{hi}(2)高达8 pm/V。利用电场诱导二次谐波效应(EFISH)可以对该值进行广泛的调谐,最大值为22.7 pm/V。我们进一步说明,这些薄膜所表现出的二阶非线性系数可以是高度色散的性质,并需要进一步的研究和分析,以评估其在电信波长的波导应用的可行性。

英文摘要:

We present experimental results on second-harmonic generation in non-stoichiometric, silicon-rich nitride (SRN) films. The as-deposited film presents a second-order nonlinear coefficient, or \c{hi}(2), as high as 8pm/V. This value can be widely tuned using the electric field induced second harmonic effect (EFISH), and a maximum value of 22.7pm/V 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 requires further study and analysis to evaluate their viability for in-waveguide applications at telecommunication wavelengths.

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