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[资源] 加州大学张翔教授又发science新文章！！！

相位匹配是相干的非线性光学处理，例如频率的关键要求转换和参量放大。相位失配防止微观非线性从建设性的结合，造成破坏性干扰，因此非常低的来源效率。我们报告的试验示范相位失配无非线性代零折射率光学超材料。相反，相位失配的补偿在常规非线性介质所需的技术，零指数省去了相匹配，允许在向前和向后两个方向高效非线性产生。我们展示了相位失配，免费非线性一代使用脉内四波混频，我们观察到一个前进到后退非线性排放比接近于1。的去除在非线性光学超材料相匹配可能会导致应用程序，如多向变频和纠缠光子的产生。
Phase Mismatch–Free Nonlinear Propagation in Optical Zero-Index Materials
Phase matching is a critical requirement for coherent nonlinear optical processes such as frequency
conversion and parametric amplification. Phase mismatch prevents microscopic nonlinear
sources from combining constructively, resulting in destructive interference and thus very low
efficiency. We report the experimental demonstration of phase mismatch–free nonlinear
generation in a zero-index optical metamaterial. In contrast to phase mismatch compensation
techniques required in conventional nonlinear media, the zero index eliminates the need for phase
matching, allowing efficient nonlinear generation in both forward and backward directions.
We demonstrate phase mismatch–free nonlinear generation using intrapulse four-wave mixing,
where we observed a forward-to-backward nonlinear emission ratio close to unity. The removal of
phase matching in nonlinear optical metamaterials may lead to applications such as
multidirectional frequency conversion and entangled photon generation.

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附件 1 : Phase_Mismatch–Free_Nonlinear_Propagation_in_Optical_Zero-Index_Materials_support.pdf

2013-12-06 15:08:01, 1.42 M