Abstract We report on fs laser structuring and graphitization of diamond and experimental characterization of its THz response. A full characterization of graphitized, conductive layer generated by laser irradiation is carried out by performing scanning-electron microscopy, Raman spectroscopy and electrical measurements. The transmittance of the laser textured diamond samples, both with the graphitic overlayer and after selective oxidizing etching, is analyzed in the (0.25 ÷ 6.0) THz spectral range. A significant selective absorption of the graphitized overlayer towards polarized THz radiation is demonstrated, which is associated to the formation of graphitic laser induced periodic surface structures. This anisotropy allows conceiving compact passive metasurfaces based on conductive/dielectric patterns on the diamond plate surface for the development of robust, lightweight and broadband THz optical components.

中文翻译：

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基于激光处理金刚石的全碳太赫兹组件

摘要 我们报告了金刚石的 fs 激光结构化和石墨化及其太赫兹响应的实验表征。通过执行扫描电子显微镜、拉曼光谱和电学测量，对激光照射产生的石墨化导电层进行全面表征。在 (0.25 ÷ 6.0) THz 光谱范围内分析具有石墨覆盖层和选择性氧化蚀刻后的激光纹理化金刚石样品的透射率。证明了石墨化覆盖层对偏振太赫兹辐射的显着选择性吸收，这与石墨激光诱导的周期性表面结构的形成有关。