Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session S52: Quantum Sensing with Defect Spin Sensors I
8:00 AM–11:00 AM,
Thursday, March 7, 2024
Room: 201AB
Sponsoring
Units:
DQI GMAG
Chair: Flavio Salvati, University of Cambridge
Abstract: S52.00001 : Characterizing the Diamond Waveguide Platform with High Density of NV− Centers for Quantum Sensing Applications*
8:00 AM–8:12 AM
Presenter:
Mohammad Sahnawaz Alam
(Institute of Theoretical Physics, Wroclaw University of Science and Technology, 50-370 Wroclaw)
Authors:
Mohammad Sahnawaz Alam
(Institute of Theoretical Physics, Wroclaw University of Science and Technology, 50-370 Wroclaw)
Yanzhao Guo
(School of Engineering, Cardiff University, Cardiff CF24 3AA)
Michal Gawelczyk
(Institute of Theoretical Physics, Wroclaw University of Science and Technology, 50-370 Wroc{l}aw)
Daniel Wigger
(School of Physics, Trinity College Dublin, Dublin 2)
Giulio Coccia
(Institute for Photonics and Nanotechnologies (IFN) CNR, 20133 Milano)
Federico Gorrini
(Molecular Biology Center, University of Torino, 10126 Torino)
Sajedeh Shahbazi
(Institute for Quantum Optics, Ulm University, D-89081 Ulm)
Vibhav Bharadwaj
(Institute for Quantum Optics, Ulm University, D-89081 Ulm)
Roberta Ramponi
(Institute for Photonics and Nanotechnologies (IFN) CNR, 20133 Milano)
Alexander Kubanek
(Institute for Quantum Optics, Ulm University, D-89081 Ulm)
Alexander Kubanek
(Institute for Quantum Optics, Ulm University, D-89081 Ulm)
Angelo Bifone
(Molecular Biology Center, University of Torino, 10126 Torino)
Shane M Eaton
(Institute for Photonics and Nanotechnologies (IFN) CNR)
John P Hadden
(School of Engineering, Cardiff University, Cardiff CF24 3AA)
Anthony J Bennett
(School of Engineering, Cardiff University, Cardiff CF24 3AA)
Pawel Machnikowski
(Institute of Theoretical Physics, Wroclaw University of Science and Technology, 50-370 Wroclaw)
The laser writing process is used to fabricate the waveguides, while simultaneously generating a high concentration of vacancies. Subsequently, the annealing process combines these vacancies with the high-density of native nitrogen impurities in the waveguide, producing a considerable number of NVs. We examine the vacancy diffusion profile to determine the diffusion constant. Next, we perform zero-field optically detected magnetic resonance (ODMR) measurements using a confocal microscope. The probed ODMR signal is sensitive to strain-driven changes to NV center spin eigenstates. We fit the ODMR data with a theoretical model that simulates the response from all NV center orientations under strain, assuming the waveguide's translational symmetry. As a result, we extract relevant strain components indirectly justifying this assumption. To gain further insights, we perform strain imaging within the structure. Based on this, we also determine the spatial variation of the refractive index, which directly affects the signal quality.
*This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 956387.
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