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Micromachines 2017, 8(2), 60;

Visible to Infrared Diamond Photonics Enabled by Focused Femtosecond Laser Pulses

Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano 20133, Italy
Istituto di Fotonica e Nanotecnologie-Consiglio Nazionale delle Ricerche (IFN-CNR), Piazza Leonardo da Vinci 32, Milano 20133, Italy
Institute for Quantum Science and Technology, University of Calgary, Calgary, AB T2N 1N4, Canada
Institute of Photonics and Nanotechnology of the National Research Council (IFN-CNR), Characterization and Development of Materials for Photonics and Optoelectronics (CSMFO) and The Centre for Materials and Microsystems (FBK-CMM), Trento 38123, Italy
Microphotonics Research Laboratory, Department of Physics, Koç University, Rumelifeneri Yolu, Istanbul 34450, Turkey
Author to whom correspondence should be addressed.
Academic Editor: Maria Farsari
Received: 18 January 2017 / Revised: 10 February 2017 / Accepted: 13 February 2017 / Published: 17 February 2017
(This article belongs to the Collection Laser Micromachining and Microfabrication)
Full-Text   |   PDF [3582 KB, uploaded 17 February 2017]   |  


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. View Full-Text
Keywords: diamond; nitrogen-vacancy (NV) center; femtosecond laser; laser micromachining; optical waveguide; magnetometry diamond; nitrogen-vacancy (NV) center; femtosecond laser; laser micromachining; optical waveguide; magnetometry

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Sotillo, B.; Bharadwaj, V.; Hadden, J.P.; Rampini, S.; Chiappini, A.; Fernandez, T.T.; Armellini, C.; Serpengüzel, A.; Ferrari, M.; Barclay, P.E.; Ramponi, R.; Eaton, S.M. Visible to Infrared Diamond Photonics Enabled by Focused Femtosecond Laser Pulses. Micromachines 2017, 8, 60.

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