论文标题

通过超快速激光结构在黑硅上形成偏振依赖性尖峰

Polarization dependent spike formation on black silicon via ultrafast laser structuring

论文作者

Skoulas, Evangelos, Mimidis, Alexandros, Demeridou, Ioanna, Tsibidis, George D., Stratakis, Emmanuel

论文摘要

提出了比较实验和理论研究,该研究集中于在SF6环境气氛下以线性,循环和方位角极化激光脉冲构建黑色硅表面的影响。结果表明,线性极化束诱导的不对称椭圆形小节形成导致由于空间不对称而引起的光吸收。相比之下,方位角极化梁的使用导致椭圆锥方向的全方向,该方向取决于激光扫描过程中局部电场。方位角极化的局部变体电场状态可导致诱导结构的选择性锥形方向。由方位角极化引起的全向圆锥分布在可见的光谱中与对称圆锥结构在可见的光谱中产生相似的,无关的吸收,只能用圆形极化梁实现。

A comparative experimental and theoretical investigation is presented that centres on the effects of structuring black silicon surfaces with linearly, circularly and azimuthally polarized laser pulses under SF6 ambient atmosphere. It is shown that the asymmetric elliptical micro-cone formations induced by linearly polarized beams result in variable light absorption due to their spatial asymmetry. By contrast, the use of azimuthally polarized beams leads to an omni-directionality of the elliptical cone orientation which is dependent on the local electric field during laser scanning. The locally variant electric field state that is azimuthally polarized leads to a selective conical orientation for the induced structures. The omni-directional conical distribution induced by azimuthal polarization produces similar, angle-independent absorption in the visible spectrum with the symmetrical conical structures that could only be realized with circularly polarized beams.

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