Dr. Carlo Bradac Profile

Dr. Carlo Bradac

at Univ of Technology Sydney

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Publications (5)

SPIE Journal Paper | 26 December 2019 Open Access

Photodynamics and quantum efficiency of germanium vacancy color centers in diamond

Minh Nguyen, Niko Nikolay, Carlo Bradac, Mehran Kianinia, Evgeny Ekimov, Noah Mendelson, Oliver Benson, Igor Aharonovich

AP, Vol. 1, Issue 06, 066002, (December 2019) https://doi.org/10.1117/12.10.1117/1.AP.1.6.066002

KEYWORDS: Neodymium, Quantum efficiency, Color centers, Diamond, Polymethylmethacrylate, Germanium, Photonics, Dielectrics, Glasses, Interfaces

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Proceedings Article | 25 August 2017 Paper

Cooperative effects between color centers in diamond: applications to optical tweezers and optomechanics

Carlo Bradac, B. Prasanna Venkatesh, Benjamin Besga, Mattias Johnsson, Gavin Brennen, Gabriel Molina-Terriza, Thomas Volz, Mathieu Juan

Proceedings Volume 10347, 103471I (2017) https://doi.org/10.1117/12.2276050

KEYWORDS: Optomechanical design, Near field optics, Optical tweezers, Quantum physics, Diamond, Near field

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Since the early work by Ashkin in 1970,¹ optical trapping has become one of the most powerful tools for manipulating small particles, such as micron sized beads² or single atoms.³ Interestingly, both an atom and a lump of dielectric material can be manipulated through the same mechanism: the interaction energy of a dipole and the electric field of the laser light. In the case of atom trapping, the dominant contribution typically comes from the allowed optical transition closest to the laser wavelength while it is given by the bulk polarisability for mesoscopic particles. This difference lead to two very different contexts of applications: one being the trapping of small objects mainly in biological settings,⁴ the other one being dipole traps for individual neutral atoms⁵ in the field of quantum optics. In this context, solid state artificial atoms present the interesting opportunity to combine these two aspects of optical manipulation. We are particularly interested in nanodiamonds as they constitute a bulk dielectric object by themselves, but also contain artificial atoms such as nitrogen-vacancy (NV) or silicon-vacancy (SiV) colour centers. With this system, both regimes of optical trapping can be observed at the same time even at room temperature. In this work, we demonstrate that the resonant force from the optical transition of NV centres at 637 nm can be measured in a nanodiamond trapped in water. This additional contribution to the total force is significant, reaching up to 10%. In addition, due to the very large density of NV centres in a sub-wavelength crystal, collective effects between centres have an important effect on the magnitude of the resonant force.⁶ The possibility to observe such cooperatively enhanced optical force at room temperature is also theoretically confirmed.⁷ This approach may enable the study of cooperativity in various nanoscale solid-state systems and the use of atomic physics techniques in the field of nano-manipulation and opto-mechanics.

Proceedings Article | 9 December 2016 Paper

Cooperatively-enhanced atomic dipole forces in optically trapped nanodiamonds containing NV centres, in liquid

Carlo Bradac, Mathieu Juan, Mattias Johnsson, Benjamin Besga, M. van Breugel, B. Baragiola, R. Martin, Gavin Brennen, Gabriel Molina-Terriza, Thomas Volz

Proceedings Volume 10013, 1001334 (2016) https://doi.org/10.1117/12.2242963

KEYWORDS: Optical tweezers, Liquids, Biomedical optics, Solid state electronics, Crystals, Quantum physics, Neodymium, Luminescence, Physics, Astronomy

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Proceedings Article | 7 December 2013 Paper

Non-intrusive tunable resonant microwave cavity for optical detected magnetic resonance of NV centres in nanodiamonds

Jean-Michel Le Floch, Carlo Bradac, Thomas Volz, Michael Tobar, Stefania Castelletto

Proceedings Volume 8923, 89233P (2013) https://doi.org/10.1117/12.2035861

KEYWORDS: Microwave radiation, Resonators, Magnetism, Luminescence, Diamond, Magnetic sensors, Dielectrics, Antennas, Electromagnetism, Interferometers

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Proceedings Article | 29 March 2013 Paper

NV center emission in a substrate free low index environment

F. Inam, M. D. W. Grogan, M. Rollings, T. Gaebel, S. Castelletto, J. Say, C. Bradac, T. Birks, W. Wadsworth, J. Rabeau, M. Steel

Proceedings Volume 8635, 86350F (2013) https://doi.org/10.1117/12.2003493

KEYWORDS: Diamond, Quantum efficiency, Pollution control, Crystals, Glasses, Silica, Optical spheres, Single photon, Finite-difference time-domain method, Luminescence

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