High harmonic generation (HHG) is strongly modified near plasmonic nanostructures due to confinement and inhomogeneity of the electromagnetic field. Previous studies have revealed low-intensity generation of HHG and extension of the plateau; however, the roles of potential shape and a combination of inhomogeneous infrared (IR) and blue fields on HHG have not been studied. In this work, we study HHG driven by inhomogeneous two-color (800–400 nm) IR and blue femtosecond pulses by numerically solving the time-dependent Schrdinger equation. HHG spectra are computed for two different models: for a short-range potential, which supports a single-bound state, and for a long-range potential, which supports a Rydberg series, to show potential dependence on inhomogeneous two-color HHG. A substantial enhancement in the value of the cut-off resulting from inhomogeneity up to the ∼600th order, extending beyond the water window, is found for both the models. The HHG spectra are highly sensitive to the relative phase of the two-color fields and this sensitivity increases with increasing inhomogeneity. Possibilities of efficiently generating and controlling attosecond pulse train and isolated attosecond pulse are discussed.

由于电磁场的限制和不均匀性，高次谐波产生 (HHG) 在等离子体纳米结构附近发生了强烈的变化。先前的研究揭示了低强度的 HHG 产生和高原的延伸；然而，尚未研究潜在形状以及非均匀红外 (IR) 和蓝色场的组合对 HHG 的作用。在这项工作中，我们通过数值求解瞬态薛定谔方程来研究由非均匀双色 (800-400 nm) IR 和蓝色飞秒脉冲驱动的 HHG。为两种不同的模型计算 HHG 光谱：支持单束缚态的短程势和支持里德堡级数的长程势，以显示对非均匀双色 HHG 的潜在依赖性。两种模型都发现了由不均匀性导致的截止值的显着增强，直到 600 阶，延伸到水窗之外。HHG 光谱对双色场的相对相位高度敏感，这种敏感性随着不均匀性的增加而增加。讨论了有效产生和控制阿秒脉冲序列和孤立阿秒脉冲的可能性。