Dr. Paul M. Thomas Profile

Dr. Paul M. Thomas

Senior Metrology Scientist at Lumetrics Inc

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Author

Publications (5)

Proceedings Article | 30 November 2023 Presentation + Paper

Low coherence interferometry for mid-IR precision optics manufacturing

Paul Thomas, Chris Cotton, Don Gibson, John Hart, Mike Marcus, John Pietruszka, David Rigolo, Richard St. Louis

Proceedings Volume 12778, 127780M (2023) https://doi.org/10.1117/12.2690583

KEYWORDS: Silicon, Windows, Optical coherence, Germanium, Precision optics, Interferometry, Gallium arsenide, Mid-IR, Manufacturing

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Proceedings Article | 13 May 2019 Paper

Ion milled facet for direct coupling to optical waveguides

Paul Thomas, Michael Fanto, John Serafini, Jeffrey Steidle, Stefan Preble, Tsung-Ju Lu, Dirk Englund

Proceedings Volume 10982, 109823H (2019) https://doi.org/10.1117/12.2523433

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Proceedings Article | 11 October 2018 Presentation

Wide-bandgap integrated photonic circuits for interfacing with quantum memories (Conference Presentation)

Michael Fanto, Tsung-Ju Lu, Hyeongrak Choi, Paul Thomas, John Serafini, Jeffrey Steidle, Christopher Tison, Stefan Preble, Mohammad Soltani, Dirk Englund, Paul Alsing, Kathy-Anne Soderberg

Proceedings Volume 10803, 108030E (2018) https://doi.org/10.1117/12.2325138

KEYWORDS: Quantum memory, Photonic integrated circuits, Integrated photonics, Integrated circuit design, Integrated circuits, Photons, Ions, Quantum information, Particles, Aluminum nitride

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Proceedings Article | 14 May 2018 Presentation

Ultraviolet integrated photonics (Conference Presentation)

Michael Fanto, Paul Thomas, Stefan Preble, Tsung-Ju Lu, Dirk Englund, Jeffrey Steidle, Zihao Wang

Proceedings Volume 10660, 1066003 (2018) https://doi.org/10.1117/12.2304998

KEYWORDS: Ultraviolet radiation, Integrated photonics, Photons, Ions, Quantum memory, Quantum information, Particles, Aluminum nitride, Ytterbium, Photonic integrated circuits

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Proceedings Article | 5 October 2017 Paper

Integrated photon sources for quantum information science applications

M. Fanto, C. Tison, J. Steidle, T. Lu, Z. Wang, N. Mogent, A. Rizzo, P. Thomas, S. Preble, P. Alsing, D. Englund

Proceedings Volume 10442, 104420K (2017) https://doi.org/10.1117/12.2282154

KEYWORDS: Resonators, Waveguides, Aluminum nitride, Microrings, Silicon, Integrated photonics, Quantum information, Ultraviolet radiation, Mach-Zehnder interferometers, Avalanche photodetectors

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Ring resonators are used as photon pair sources by taking advantage of the materials second or third order non- linearities through the processes of spontaneous parametric downconversion and spontaneous four wave mixing respectively. Two materials of interest for these applications are silicon for the infrared and aluminum nitride for the ultraviolet through the infrared. When fabricated into ring type sources they are capable of producing pairs of indistinguishable photons but typically suffer from an effective 50% loss. By slightly decoupling the input waveguide from the ring, the drop port coincidence ratio can be significantly increased with the trade-off being that the pump is less efficiently coupled into the ring. Ring resonators with this design have been demonstrated having coincidence ratios of 96% but requiring a factor of ~10 increase in the pump power. Through the modification of the coupling design that relies on additional spectral dependence, it is possible to achieve similar coincidence ratios without the increased pumping requirement. This can be achieved by coupling the input waveguide to the ring multiple times, thus creating a Mach-Zehnder interferometer. This coupler design can be used on both sides of the ring resonator so that resonances supported by one of the couplers are suppressed by the other. This is the ideal configuration for a photon-pair source as it can only support the pump photons at the input side while only allowing the generated photons to leave through the output side. Recently, this device has been realized with preliminary results exhibiting the desired spectral dependence and with a coincidence ratio as high as ~ 97% while allowing the pump to be nearly critically coupled to the ring. The demonstrated near unity coincidence ratio infers a near maximal heralding efficiency from the fabricated device. This device has the potential to greatly improve the scalability and performance of quantum computing and communication systems.

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