研究目的
To optimize the process for graphitic column production in diamond samples by characterizing the graphitisation of electrodes as a function of fabrication parameters such as power, speed, and polarization in a laser set-up.
研究成果
The pulse energy dependence is the most dominant parameter in terms of electrode cross section. Translational speed and polarization do not show a significant effect on the electrode size. The graphite content of the electrodes did not show a clear dependence on any of the studied fabrication parameters. Follow-up studies will correlate the electrode fabrication procedure with the quality of these electrodes in terms of resistivity and charge collection efficiency.
研究不足
The study did not observe a significant effect of polarization on electrode diameter, possibly due to a relatively low polarization purity (78%). The graphite content of the electrodes showed no clear dependence on the studied fabrication parameters.
1：Experimental Design and Method Selection:
The study involves the use of a femtosecond laser to graphitise diamond via non-linear absorption, focusing on the fabrication of column-like electrodes inside the bulk of diamond samples.
2：Sample Selection and Data Sources:
Single-crystal chemical vapour deposition (sCVD) and polycrystalline CVD (pCVD) diamond samples were used.
3：List of Experimental Equipment and Materials:
Equipment includes a Coherent Libra Ti:Sapphire femtosecond laser, a liquid crystal on silicon (LCOS) spatial light modulator (SLM), a Nikon CFI Plan Fluor 20XC MI objective, and a three-axis precision scanning system.
4：Experimental Procedures and Operational Workflow:
Electrodes were fabricated by focusing the laser towards the back plane of the diamond sample, translating the sample away from the objective to produce column-like electrodes.
5：Data Analysis Methods:
The electrode diameter was measured, and Raman spectroscopy was performed to characterize the graphitic content of the electrodes.
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