Prof. Jason M. Smith Profile

Prof. Jason M. Smith

Professor, Photonic Materials & Devices at Univ of Oxford

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Publications (8)

Proceedings Article | 13 March 2024 Presentation + Paper

Aspect ratio measurement of water-based rod-shaped particles in optical microcavities

Yumeng Yin, Aurelien Trichet, Jason Smith

Proceedings Volume 12861, 1286107 (2024) https://doi.org/10.1117/12.3001900

KEYWORDS: Particles, Optical microcavities, Gold nanorods, Materials properties, Polarized light, Gold nanoparticles, Anisotropy, Polarization, Polarizability, Pathogens

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Proceedings Article | 12 March 2024 Presentation + Paper

Laser written nitrogen vacancy centers in diamond integrated with transfer print GaN solid immersion lenses

Xingrui Cheng, Nils Kolja Wessling, Saptarsi Ghosh, Andrew Kirkpatrick, Menno Kappers, Yashna N. Lekhai, Gavin Morley, Rachel Oliver, Martin Dawson, Jason Smith, Patrick Salter, Michael Strain

Proceedings Volume 12874, 1287405 (2024) https://doi.org/10.1117/12.3000474

KEYWORDS: Gallium nitride, Objectives, Diamond, Printing, Lenses, Quantum emitters, Nitrogen, Solids, Photoluminescence, Fabrication

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Proceedings Article | 4 March 2019 Presentation

Towards an efficient spin-photon interface with near-deterministically engineered defects in diamond

Laiyi Weng, Sam Johnson, Paul Hill, Hangyu Liu, Yu-chen Chen, Ben Griffiths, Shannon Nicley, Shazeaa Ishmael, Colin Stephen, Yashna Lekhai, Ben Green, Aurelien A. Trichet, Patrick Salter, Martin Booth, Erdan Gu, Gavin Morley, Martin Newton, Jason Smith

Proceedings Volume 10933, 109330E (2019) https://doi.org/10.1117/12.2507298

KEYWORDS: Diamond, Interfaces, Quantum communications, Quantum networks, Optical networks, Nitrogen, Diffusion, Laser processing, Laser systems engineering, Luminescence

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Proceedings Article | 23 May 2018 Presentation

Towards an efficient spin-photon interface with NV centres in diamond (Conference Presentation)

Laiyi Weng, Sam Johnson, Hangyu Liu, Ross Leyman, Yu-Chen Chen, Shazeaa Ishmael, Paul Hill, Ben Green, Gavin Morley, Aurelien A. Trichet, Erdan Gu, Mark Newton, Jason Smith

Proceedings Volume 10672, 106720U (2018) https://doi.org/10.1117/12.2306650

KEYWORDS: Diamond, Interfaces, Nitrogen, Mirrors, Phonons, Crystals, Reflectivity, Scattering, Quantum information, Photons

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The negatively charged nitrogen vacancy centre in diamond is known for its coherent spin properties and optical interface, and thus is regarded a promising candidate for quantum information applications [1]. Realisation of an efficient spin-photon interface with the NV centre is made challenging however by the fact that, in bulk diamond, only 3-4% of spontaneously emitted photons occur in the zero phonon line (ZPL). Placing NV centre in an optical cavity is being explored by several groups [2][3][4] as an effective way to selectively enhance the coherent emission of NVs and thereby increase the efficiency of the coherent spin-photon coupling. Previous work reported successful coupling of the NV in nano-diamond to an open access micro-cavity and observed enhanced ZPL emission [5]. However the NV centres in nano-diamond suffer from broadened zero phonon transition and poor spin coherence. By fabricating NV centres in a ~micrometre thick membrane of high purity single crystal material we can take advantage of the tunability of open access cavities, and at the same time, provide close-to-bulk crystal environment to maintain the coherent spin properties of the NV centres. Here we report our work on the tunable cavity coupling of the ZPL of a NV centre in a 1.2micrometre-thick diamond membrane at 4K. The diamond membrane is fabricated from a 0.5mm-thick E6 CVD diamond plate where ion implantation is carried out on both surfaces to create NV centres at the depth of around 70nm. The plate is then machined into 30micrometre-thick slices, and thinned by ICP-RIE with a combination of Ar/Cl[6] and pure oxygen plasma etching recipes. The open cavity consists of a concave mirror (99.99% reflectivity) deposited on a template fabricated using Focused Ion Beam (FIB) milling[7] and a planar mirror (99.8% reflectivity) which supports the membrane. For bare cavities with mirror radii of curvature (RoC) of 12micrometre, we measured a finesse of F~2000 and mode volume as small as 0.75micrometre^3. In-situ tuning of the cavity resonance is achieved with piezoelectric actuators. When mounted in our bath cryostat the cavity modes have dominant Lorentzian line profiles which indicate a passive stability of the cavity length of better than 0.15nm. No active locking is currently deployed. With the presence of a diamond membrane inside the cavities, the measured finesse and mode volume of a cavity with 12micrometre RoC are found to be around 300 and 3 micrometre^3, respectively. We attribute the reduction in finesse to scattering at the membrane-air and membrane-mirror interfaces. On coupling to the ZPL of a target NV centre, we record a factor of 4 increase in the saturated intensity of ZPL fluorescence compared to that measured from the same NV centre in absence of the concave mirror. This result is consistent with the calculated Purcell factor of 16 combined with a relatively low efficiency of light extraction (estimated to be around 19%) from the cavity due to the scattering losses.

Proceedings Article | 14 March 2018 Presentation

Room-temperature single-photon sources using solid-state emitters and open-access microcavities (Conference Presentation)

Sanmi Adekanye, Philip Dolan, Aurelien A. Trichet, Sam Johnson, Jason Smith

Proceedings Volume 10547, 105470X (2018) https://doi.org/10.1117/12.2290398

KEYWORDS: Single photon, Optical microcavities, Quantum computing, Solid state electronics, Diamond, Boron, Quantum information, Quantum communications, Quantum key distribution, Ion beams

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Proceedings Article | 2 June 2017 Presentation

Tunable open-cavity coupling to the zero phonon line of a nitrogen-vacancy defect in diamond (Conference Presentation)

Sam Johnson, Laiyi Weng, Philip Dolan, Aurelien A. Trichet, Sanmi Adekanye, Yu-Chen Chen, Ross Leyman, Paul Hill, Ben Green, Gavin Morley, Mark Newton, Erdan Gu, Jason Smith

Proceedings Volume 10118, 101180W (2017) https://doi.org/10.1117/12.2251479

KEYWORDS: Mirrors, Quantum computing, Diamond, Interfaces, Phonons, Photonics, Cryogenics, Quantum networks, Color centers, Ion beams

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Proceedings Article | 2 May 2017 Presentation

Nanoparticle trapping and characterization with open microcavities (Conference Presentation)

Aurelien Trichet, Philip Dolan, Dean James, Gareth Hughes, Claire Vallance, Jason Smith

Proceedings Volume 10081, 100810H (2017) https://doi.org/10.1117/12.2251466

KEYWORDS: Microresonators, Gold, Proteins, Nanoparticles, Optical microcavities, Viruses, Electromagnetism, Resonators, Particles, Anisotropy

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Proceedings Article | 29 January 2008 Paper

Toward measurement-based quantum computing using solid state spins

Jason Smith, Brian Patton, Fabio Grazioso

Proceedings Volume 6903, 69030I (2008) https://doi.org/10.1117/12.772317

KEYWORDS: Quantum communications, Photons, Quantum computing, Solid state electronics, Diamond, Quantum dots, Sensors, Phonons, Electrons, Solid state physics

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Showing 5 of 8 publications

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