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Research

Dr Jonathan Gratus

Senior Lecturer

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  1. 2024
  2. Published

    Corrugated waveguide with matched phase and group velocities: an extended regime of wave-beam interaction

    Siaber, S., Gratus, J., Seviour, R., Jamison, S. & Boyd, T., 11/06/2024, In: Optics Express. 32, 13, p. 23288-23302 15 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  3. 2023
  4. Published

    Moment tracking and their coordinate transformations for macroparticles with an application to plasmas around black holes

    Warwick, A. & Gratus, J., 19/12/2023, In: Plasma Physics and Controlled Fusion. 66, 1, 015014.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  5. Published

    The Distributional Stress–Energy Quadrupole and Gravitational Waves

    Gratus, J. & Talaganis, S., 15/12/2023, In: Universe. 9, 12, 14 p., 518.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  6. Published

    Broadband Terahertz Generation in a Corrugated Waveguide with matched Phase and Group Velocities

    Siaber, S., Gratus, J., Seviour, R., Jamison, S. & Boyd, T., 11/10/2023, In: arxiv.org.

    Research output: Contribution to Journal/Magazine › Journal article

  7. Published

    Moment tracking and their coordinate transformations for macroparticles with an application to plasmas around black holes

    Warwick, A. & Gratus, J., 2/08/2023, Arxiv.

    Research output: Working paper › Preprint

  8. Published

    The tensorial representation of the distributional stress–energy quadrupole and its dynamics

    Gratus, J. & Talaganis, S., 20/04/2023, In: Classical and Quantum Gravity. 40, 8, 30 p., 085012.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  9. Published

    A Novel Approach to Electromagnetic Constitutive Relations

    McCall, M., Kinsler, P. & Gratus, J., 1/02/2023, Adventures in Contemporary Electromagnetic Theory. Mackay, T. G. & Lakhtakia, A. (eds.). Cham: Springer, p. 33-60 28 p.

    Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Chapter (peer-reviewed) › peer-review

  10. 2022
  11. Published

    The tensorial representation of the distributional stress-energy quadrupole and its dynamics

    Gratus, J. & Talaganis, S., 7/11/2022, Arxiv.

    Research output: Working paper › Preprint

  12. Published

    Maxwell-Lorentz without self-interactions: Conservation of energy and momentum

    Gratus, J., 21/01/2022, In: Journal of Physics A: Mathematical and General . 55, 6, 14 p., 065202.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  13. 2021
  14. Published

    Temporal boundaries in electromagnetic materials

    Gratus, J., Seviour, R., Kinsler, P. & Jaroszynski, D. A., 19/08/2021, In: New Journal of Physics. 23, 12 p., 083032.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  15. Published

    Temporary Singularities and Axions: an analytic solution that challenges charge conservation

    Gratus, J., Kinsler, P. & McCall, M., 30/06/2021, In: Annalen der Physik. 533, 6, 13 p., 2000565.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  16. 2020
  17. Published

    The distributional stress-energy quadrupole

    Gratus, J., Pinto, P. & Talaganis, S., 23/12/2020, In: Classical and Quantum Gravity. 38, 3, 51 p., 035011.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  18. Published

    Maxwell's Equations, Stokes' Theorem, and the Conservation of Charge

    Gratus, J., Kinsler, P. & McCall, M., 6/11/2020, In: arXiv.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  19. Published

    Temporary Singularities and Axions an analytic solution that challenges charge conservation

    Gratus, J., Kinsler, P. & McCall, M. W., 5/08/2020, In: arxiv.org.

    Research output: Contribution to Journal/Magazine › Journal article

  20. Published

    The Distributional Stress-Energy Quadrupole

    Gratus, J., Pinto, P. & Talaganis, S., 6/05/2020, In: arxiv.org.

    Research output: Contribution to Journal/Magazine › Journal article

  21. Published

    Electromagnetism, Axions, and Topology: a first-order operator approach to constitutive responses provides greater freedom

    Gratus, J., McCall, M. W. & Kinsler, P., 7/04/2020, In: Physical Review A - Atomic, Molecular, and Optical Physics. 101, 4, 18 p., 043804.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  22. 2019
  23. Published

    Evaporating black-holes, wormholes, and vacuum polarisation: must they always conserve charge?

    Gratus, J., Kinsler, P. & McCall, M., 1/04/2019, In: Foundations of Physics. 49, 4, p. 330-350 21 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  24. Published

    Maxwell's (D, H ) excitation fields: lessons from permanent magnets

    Gratus, J., Kinsler, P. & McCall, M., 18/02/2019, In: European Journal of Physics. 40, 2, 13 p., 025203.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  25. 2018
  26. Published

    Mode profile shaping in wire media: towards an experimental verification

    Boyd, T., Gratus, J., Kinsler, P., Letizia, R. & Seviour, R., 1/08/2018, In: Applied Sciences. 8, 8, 11 p., 1276.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  27. Published

    Roadmap on Transformation Optics

    McCall, M., Pendy, J., Galdi, V., Lai, Y., Horsely, S., Zhu, J., Mitchell-Thomas, R., Quevedo-Teruel, O., Tassin, P., Ginis, V., Martini, E., Minatti, G., Maci, S., Hao, Y., Kinsler, P., Gratus, J., Lukens, J., Weiner, A., Leonhardt, U. & Smolyaninov, I. & 5 others, Smolyaninova, V., Thompson, R., Wegener, M., Kadic, M. & Cummer, S., 22/05/2018, In: Journal of Optics. 20, 6, 44 p., 063001.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  28. Published

    The correct and unusual coordinate transformation rules for electromagnetic quadrupoles

    Gratus, J. & Banaszek, T., 05/2018, In: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. 474, 2213, 16 p., 20170652.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  29. Published

    Customizing longitudinal electric field profiles using spatial dispersion in dielectric wire arrays

    Boyd, T., Gratus, J., Kinsler, P. & Letizia, R., 5/02/2018, In: Optics Express. 26, 3, p. 2478-2494 17 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  30. Published

    On K-Jet Field Approximations to Geodesic Deviation Equations

    Gratus, J. & Gallego Torrome, R., 2018, In: International Journal of Geometric Methods in Modern Physics. 15, 12, 1850199.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  31. 2017
  32. Published

    A pictorial introduction to differential geometry, leading to Maxwell's equations as three pictures

    Gratus, J., 21/09/2017, In: arxiv.org.

    Research output: Contribution to Journal/Magazine › Journal article

  33. Published

    Subwavelength mode profile customisation using functional materials

    Gratus, J., Kinsler, P., Letizia, R. & Boyd, T., 6/09/2017, In: Journal of Physics Communications. 1, 2, 8 p., 025003.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

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