Fabrication of conductive graphitic wires in diamond by Bessel beam micromachining: highlighting the role of the crystallographic orientation and of the burst mode laser writing

Akhil Kuriakose; Francesco P. Mezzapesa; Caterina Gaudiuso; Andrea Chiappini; Pietro Aprà; Federico Picollo; Antonio Ancona; Ottavia Jedrkiewicz

doi:10.1117/12.3017460

20 June 2024 Fabrication of conductive graphitic wires in diamond by Bessel beam micromachining: highlighting the role of the crystallographic orientation and of the burst mode laser writing

Akhil Kuriakose, Francesco P. Mezzapesa, Caterina Gaudiuso, Andrea Chiappini, Pietro Aprà, Federico Picollo, Antonio Ancona, Ottavia Jedrkiewicz

Author Affiliations +

Proceedings Volume 13005, Laser + Photonics for Advanced Manufacturing; 130050K (2024) https://doi.org/10.1117/12.3017460
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

We present the fabrication of high-quality graphitic micro-wires in diamond which are conductive in nature using pulsed Bessel beams. The electrodes are created in the bulk of 500 μm thick monocrystalline CVD and HPHT diamond samples perpendicular to the sample surface without sample translation or beam scanning. The role of various beam parameters such as pulse energy and pulse duration, different crystallographic orientations of the sample and two different writing modes of the laser namely burst mode and single-pulse mode in the conductivity of such electrodes are investigated. While the morphology of the electrodes is analysed using optical microscopy, the conductivity is measured experimentally using current-voltage characterisation. Furthermore, micro-Raman spectroscopy is implemented to investigate the graphitic content of electrodes fabricated. We have observed that higher pulse duration favours better conductivity while pulse energy has an optimum value for the same. As for the crystallographic orientations, we have found that it is possible to eradicate the potential barrier in the current-voltage curves completely even for graphitic wires fabricated at low pulse energy and in the fs pulse duration regime in a (110) oriented sample in contrast to the (100) oriented-crystal case where the barrier is generally observed. Finally, in case of wires fabricated with laser bursts with femtosecond sub-pulses, the higher number of sub-pulses, lower time delay between them and longer total burst duration favours better conductivity. Through various optimisation techniques, we report resistivity values as low as 0.01 Ω cm for the Bessel beam written electrodes in diamond.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Akhil Kuriakose, Francesco P. Mezzapesa, Caterina Gaudiuso, Andrea Chiappini, Pietro Aprà, Federico Picollo, Antonio Ancona, and Ottavia Jedrkiewicz "Fabrication of conductive graphitic wires in diamond by Bessel beam micromachining: highlighting the role of the crystallographic orientation and of the burst mode laser writing", Proc. SPIE 13005, Laser + Photonics for Advanced Manufacturing, 130050K (20 June 2024); https://doi.org/10.1117/12.3017460

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