3D Dirac半金属中高次谐波产生的双折射极限
Propagation-induced limits to high harmonic generation in 3D Dirac semimetals
摘要：
三维狄拉克半金属（DSMs）是一种很有前途的太赫兹高次谐波产生材料。我们表明，三维DSM的高非线性开辟了一个制度的非线性光学极端亚波长电流密度的特点，在纳米级的传播距离内的驱动场。我们的研究结果揭示了较厚的3D DSM膜的HHG强度的数量级增强，并表明这些亚波长特征从根本上限制了HHG增强超过最佳膜厚度。HHG强度的这种超过最佳厚度的降低构成了有效的传播诱导的退相。我们的研究结果突出了极端光学非线性纳米薄膜中传播动力学的重要性。
英文摘要：
3D Dirac semimetals (DSMs) are promising materials for terahertz high harmonic generation (HHG). We show that 3D DSMs' high nonlinearity opens up a regime of nonlinear optics where extreme subwavelength current density features develop within nanoscale propagation distances of the driving field. Our results reveal orders-of-magnitude enhancement in HHG intensity with thicker 3D DSM films, and show that these subwavelength features fundamentally limit HHG enhancement beyond an optimal film thickness. This decrease in HHG intensity beyond the optimal thickness constitutes an effective propagation-induced dephasing. Our findings highlight the importance of propagation dynamics in nanofilms of extreme optical nonlinearity.
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