Visible to infrared diamond photonics enabled by focused femtosecond laser pulses

Sotillo, Belén, Bharadwaj, Vibhav, Hadden, John ORCID: https://orcid.org/0000-0001-5407-6754, Rampini, Stefano, Chiappini, Andrea, Fernandez, Toney, Armellini, Cristina, Serpengüzel, Ali, Ferrari, Maurizio, Barclay, Paul, Ramponi, Roberta and Eaton, Shane 2017. Visible to infrared diamond photonics enabled by focused femtosecond laser pulses. Micromachines 8 (2) , 60. 10.3390/mi8020060

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Abstract

Diamond’s nitrogen-vacancy (NV) centers show great promise in sensing applications and quantum computing due to their long electron spin coherence time and because they can be found, manipulated, and read out optically. An important step forward for diamond photonics would be connecting multiple diamond NVs together using optical waveguides. However, the inertness of diamond is a significant hurdle for the fabrication of integrated optics similar to those that revolutionized silicon photonics. In this work, we show the fabrication of optical waveguides in diamond, enabled by focused femtosecond high repetition rate laser pulses. By optimizing the geometry of the waveguide, we obtain single mode waveguides from the visible to the infrared. Additionally, we show the laser writing of individual NV centers within the bulk of diamond. We use µ-Raman spectroscopy to gain better insight on the stress and the refractive index profile of the optical waveguides. Using optically detected magnetic resonance and confocal photoluminescence characterization, high quality NV properties are observed in waveguides formed in various grades of diamond, making them promising for applications such as magnetometry, quantum information systems, and evanescent field sensors.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	MDPI
ISSN:	2072-666X
Date of First Compliant Deposit:	6 December 2018
Date of Acceptance:	13 February 2017
Last Modified:	06 May 2023 04:39
URI:	https://orca.cardiff.ac.uk/id/eprint/114114

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