Broad Frequency Shift of Parametric Processes in Epsilon-Near-Zero Time-Varying Media
Broad Frequency Shift of Parametric Processes in Epsilon-Near-Zero Time-Varying Media
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DOI：
10.3390/app10041318
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发表时间：
2020-02-01
影响因子：
2.7
通讯作者：
Clerici, Matteo
中科院分区：
文献类型：
--
作者：
Bruno, Vincenzo;Vezzoli, Stefano;Clerici, Matteo
短脉冲激光引起的材料性质的超快变化可导致反射和透射辐射的频率偏移。最近的报告强调了这样的频移是如何在光谱区域中增强的，其中材料具有接近零的介电常数的真实的部分。在这里，我们调查四波混频产生的领域的频移。在我们的实验中，我们观察到超过60 nm的频率偏移（相比类似于40 nm的脉冲宽度）的相位共轭辐射产生的500 nm的掺铝氧化锌（AZO）膜泵浦接近ε-近零波长。我们的研究结果表明，时变介质的非线性光学和频率转换的应用。
The ultrafast changes of material properties induced by short laser pulses can lead to a frequency shift of reflected and transmitted radiation. Recent reports highlight how such a frequency shift is enhanced in spectral regions where the material features a near-zero real part of the permittivity. Here, we investigate the frequency shift for fields generated by four-wave mixing. In our experiment, we observed a frequency shift of more than 60 nm (compared to the pulse width of similar to 40 nm) in the phase conjugated radiation generated by a 500 nm aluminium-doped zinc oxide (AZO) film pumped close to the epsilon-near-zero wavelength. Our results indicate applications of time-varying media for nonlinear optics and frequency conversion.