研究目的
Investigating the THz response of fs laser structured and graphitized diamond for the development of robust, lightweight and broadband THz optical components.
研究成果
The study demonstrates a significant selective absorption of the graphitized overlayer towards polarized THz radiation, associated with the formation of graphitic laser induced periodic surface structures. This anisotropy allows for the development of compact passive metasurfaces for robust, lightweight and broadband THz optical components. Further optimization of the graphitized-diamond layer features could enhance the anisotropy and performance of these components.
研究不足
The study is limited by the spectral range of the TDS systems used (0.25 ÷ 6.0 THz) and the resolution of the measurements. The anisotropy in THz response is pronounced but could be further optimized by adjusting the graphitized-diamond layer features.
1：Experimental Design and Method Selection:
The study involves fs laser structuring and graphitization of diamond, followed by characterization using scanning-electron microscopy, Raman spectroscopy, and electrical measurements. The transmittance of the samples is analyzed in the THz spectral range using two different TDS systems.
2：Sample Selection and Data Sources:
Free-standing thermal grade, polycrystalline, CVD diamond plates were used as starting material.
3：List of Experimental Equipment and Materials:
Ti:Sapphire laser system, FE-SEM (Leo Supra-35 model), Dilor XY triple spectrometer for Raman spectroscopy, Van der Pauw method for electrical resistivity measurement, two different TDS systems for THz response characterization.
4：Experimental Procedures and Operational Workflow:
Diamond samples were irradiated with fs laser pulses to produce a graphitized, conductive overlayer. Some samples underwent selective oxidizing wet etching to remove the graphitic overlayer. The samples were then characterized for their THz response.
5：Data Analysis Methods:
The transmittance of the samples was derived from the comparison with the reference electric fields. The absorption coefficient of the graphitic layer was estimated using a heuristic model.
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