All Stories

  1. Spiral adaptive Fresnel lens: generalizations, improvements, and augmented-reality/virtual-reality simulations

    Article • Journal of the Optical Society of America A, October 2025, Optical Society of America (OSA)

    Johannes Courtial

  2. Spiral adaptive Fresnel lens: wave optics

    Article • Journal of the Optical Society of America A, October 2025, Optical Society of America (OSA)

    Johannes Courtial

  3. Adaptive Fresnel lens: basic theory

    Article • Journal of the Optical Society of America A, January 2025, Optical Society of America (OSA)

    Johannes Courtial

  4. Geometric construction of relativistic and non-relativistic distortion

    Article • Journal of the Optical Society of America A, June 2024, Optical Society of America (OSA)

    Johannes Courtial

  5. Shifty invisibility cloaks

    Article • Optics Express, December 2023, Optical Society of America (OSA)

    Johannes Courtial

  6. Skew-lens image rotator

    Article • Optics Express, July 2022, Optical Society of America (OSA)

    Johannes Courtial

  7. 2021 JOSA A Emerging Researcher Best Paper Prize: editorial

    Article • Journal of the Optical Society of America A, April 2022, Optical Society of America (OSA)

    Johannes Courtial

  8. Lens stars and Platonic lenses

    Article • Optics Express, December 2021, Optical Society of America (OSA)

    Johannes Courtial

  9. 2020 JOSA A Emerging Researcher Best Paper Prize: editorial

    Article • Journal of the Optical Society of America A, April 2021, Optical Society of America (OSA)

    Johannes Courtial

  10. Optical triangulations of curved spaces

    Article • Optica, February 2020, Optical Society of America (OSA)

    Johannes Courtial

  11. Combinations of generalized lenses that satisfy the edge-imaging condition of transformation optics

    Article • Journal of the Optical Society of America A, January 2020, Optical Society of America (OSA)

    Dr Euan N Cowie, Johannes Courtial

  12. Relativistic photography with a wide aperture

    Article • Journal of the Optical Society of America A, December 2019, Optical Society of America (OSA)

    Johannes Courtial

  13. Ideal-lens cloaks and new cloaking strategies

    Article • Optics Express, December 2019, Optical Society of America (OSA)

    Dr Euan N Cowie, Johannes Courtial

  14. Fractal light from lasers

    Article • Physical Review A, January 2019, American Physical Society (APS)

    Johannes Courtial

  15. Arrays of dark optical traps on a toroidal surface

    Article • Physical Review A, January 2019, American Physical Society (APS)

    Johannes Courtial

  16. Imaging with two skew ideal lenses

    Article • Journal of the Optical Society of America A, December 2018, Optical Society of America (OSA)

    Johannes Courtial

  17. Invisibility cloak built of only lenses and looking through the lens

    Article • Optics Express, June 2018, Optical Society of America (OSA)

    Dr Euan N Cowie, Johannes Courtial, Jakub Belin

  18. Experimental demonstration of ray-rotation sheets

    Article • Journal of the Optical Society of America A, June 2018, Optical Society of America (OSA)

    Johannes Courtial

  19. Graphene-like optical light field and its interaction with two-level atoms

    Article • Physical Review A, December 2015, American Physical Society (APS)

    Johannes Courtial

  20. Direct stigmatic imaging with curved surfaces

    Article • Journal of the Optical Society of America A, February 2015, Optical Society of America (OSA)

    Johannes Courtial

  21. Dr TIM: Ray-tracer TIM, with additional specialist scientific capabilities

    Article • Computer Physics Communications, March 2014, Elsevier

    Johannes Courtial

  22. Law of refraction for generalised confocal lenslet arrays

    Article • Optics Communications, February 2014, Elsevier

    Johannes Courtial

  23. Perfect imaging with planar interfaces

    Article • Journal of the Optical Society of America A, October 2013, Optical Society of America (OSA)

    Johannes Courtial

  24. Efficient measurement of an optical orbital-angular-momentum spectrum comprising more than 50 states

    Article • New Journal of Physics, January 2013, Institute of Physics Publishing

    Johannes Courtial

  25. A simple experiment that demonstrates the “green flash”

    Article • American Journal of Physics, November 2012, American Association of Physics Teachers (AAPT)

    Johannes Courtial

  26. View rotation with parallel ray-rotating windows

    Article • Optics Communications, November 2012, Elsevier

    Johannes Courtial

  27. Autostereogram resonators

    Article • Optics Communications, September 2012, Elsevier

    Johannes Courtial

  28. Generalized laws of refraction that can lead to wave-optically forbidden light-ray fields

    Article • Journal of the Optical Society of America A, June 2012, Optical Society of America (OSA)

    Johannes Courtial

  29. TIM, a ray-tracing program for METATOY research and its dissemination

    Article • Computer Physics Communications, March 2012, Elsevier

    Johannes Courtial

  30. Imaging with complex ray-optical refractive-index interfaces between complex object and image distances

    Article • Optics Letters, February 2012, Optical Society of America (OSA)

    Johannes Courtial

  31. Refractive elements for the measurement of the orbital angular momentum of a single photon

    Article • Optics Express, January 2012, Optical Society of America (OSA)

    Johannes Courtial

  32. METATOYs and optical vortices

    Article • Journal of Optics, November 2011, Institute of Physics Publishing

    Johannes Courtial

  33. Robust interferometer for the routing of light beams carrying orbital angular momentum

    Article • New Journal of Physics, September 2011, Institute of Physics Publishing

    Johannes Courtial

  34. Quantifying metarefraction with confocal lenslet arrays

    Article • Optics Communications, September 2011, Elsevier

    Johannes Courtial

  35. Measurement of the light orbital angular momentum spectrum using an optical geometric transformation

    Article • Journal of Optics, April 2011, Institute of Physics Publishing

    Johannes Courtial

  36. Measuring the orbital angular momentum of light

    Article • February 2011, SPIE

    Johannes Courtial

  37. Experimental demonstration of ray-optical refraction with confocal lenslet arrays

    Article • Optics Letters, November 2010, Optical Society of America (OSA)

    Johannes Courtial

  38. Efficient Sorting of Orbital Angular Momentum States of Light

    Article • Physical Review Letters, October 2010, American Physical Society (APS)

    Johannes Courtial

  39. Local light-ray rotation around arbitrary axes

    Article • Journal of Optics, August 2010, Institute of Physics Publishing

    Johannes Courtial

  40. Experimental demonstration of a light-ray-direction-flipping METATOY based on confocal lenticular arrays

    Article • Optics Communications, November 2009, Elsevier

    Johannes Courtial

  41. METATOYs as optical elements performing light-ray transformations without wave-optical analog

    Article • September 2009, Institute of Electrical & Electronics Engineers (IEEE)

    Johannes Courtial

  42. Mimicking visual properties of metamaterials with METATOYs

    Article • September 2009, Institute of Electrical & Electronics Engineers (IEEE)

    Johannes Courtial

  43. Geometric limits to geometric optical imaging with infinite, planar, non-absorbing sheets

    Article • Optics Communications, July 2009, Elsevier

    Johannes Courtial

  44. Standard and non-standard metarefraction with confocal lenslet arrays

    Article • Optics Communications, July 2009, Elsevier

    Johannes Courtial

  45. Local light-ray rotation

    Article • Journal of Optics A Pure and Applied Optics, May 2009, Institute of Physics Publishing

    Johannes Courtial

  46. Generalized refraction using lenslet arrays

    Article • Journal of Optics A Pure and Applied Optics, March 2009, Institute of Physics Publishing

    Johannes Courtial

  47. Fermat's principle and the formal equivalence of local light-ray rotation and refraction at the interface between homogeneous media with a complex refractive index ratio

    Article • Optics Letters, January 2009, Optical Society of America (OSA)

    Johannes Courtial

  48. Metamaterials for light rays: ray optics without wave-optical analog in the ray-optics limit

    Article • New Journal of Physics, January 2009, Institute of Physics Publishing

    Johannes Courtial

  49. Superoscillation in speckle patterns

    Article • Optics Letters, December 2008, Optical Society of America (OSA)

    Johannes Courtial

  50. Imaging with parallel ray-rotation sheets

    Article • Optics Express, December 2008, Optical Society of America (OSA)

    Johannes Courtial

  51. Photorealistic visualization of imaging in canonical optical resonators

    Article • American Journal of Physics, November 2008, American Association of Physics Teachers (AAPT)

    Johannes Courtial

  52. Optical properties of a Dove-prism sheet

    Article • Journal of Optics A Pure and Applied Optics, October 2008, Institute of Physics Publishing

    Johannes Courtial

  53. Ray-optical refraction with confocal lenslet arrays

    Article • New Journal of Physics, August 2008, Institute of Physics Publishing

    Johannes Courtial

  54. Simulated holographic three-dimensional intensity shaping of evanescent-wave fields

    Article • Journal of the Optical Society of America B, April 2008, Optical Society of America (OSA)

    Johannes Courtial

  55. Holographic assembly workstation for optical manipulation

    Article • Journal of Optics A Pure and Applied Optics, March 2008, Institute of Physics Publishing

    Johannes Courtial

  56. Holographic shaping of generalized self-reconstructing light beams

    Article • Optics Communications, March 2008, Elsevier

    Johannes Courtial

  57. Ray-optical negative refraction and pseudoscopic imaging with Dove-prism arrays

    Article • New Journal of Physics, February 2008, Institute of Physics Publishing

    Johannes Courtial

  58. Simulation of superresolution holography for optical tweezers

    Article • New Journal of Physics, February 2008, Institute of Physics Publishing

    Johannes Courtial

  59. Experiments with twisted light

    Article • The European Physical Journal Special Topics, June 2007, Springer Science + Business Media

    Johannes Courtial

  60. Holographic 3D intensity shaping of evanescent waves

    Article • June 2007, Institute of Electrical & Electronics Engineers (IEEE)

    Johannes Courtial

  61. Fourier transforming a trapped Bose–Einstein condensate by waiting a quarter of the trap period: simulation and applications

    Article • New Journal of Physics, September 2006, Institute of Physics Publishing

    Johannes Courtial

  62. Iterative algorithms for holographic shaping of non-diffracting and self-imaging light beams

    Article • Optics Express, March 2006, Optical Society of America (OSA)

    Johannes Courtial

  63. Interactive approach to optical tweezers control

    Article • Applied Optics, February 2006, Optical Society of America (OSA)

    Johannes Courtial

  64. Angular momentum of optical vortex arrays

    Article • Optics Express, January 2006, Optical Society of America (OSA)

    Johannes Courtial

  65. Fourier relationship between angular position and optical orbital angular momentum

    Article • Optics Express, January 2006, Optical Society of America (OSA)

    Johannes Courtial

  66. Observation of quantum entanglement using spatial light modulators

    Article • Optics Express, January 2006, Optical Society of America (OSA)

    Johannes Courtial

  67. Experimental demonstration of holographic three-dimensional light shaping using a Gerchberg–Saxton algorithm

    Article • New Journal of Physics, May 2005, Institute of Physics Publishing

    Johannes Courtial

  68. An interactive approach to optical tweezer control

    Article • March 2005, SPIE

    Johannes Courtial

  69. Vortex knots in light

    Article • New Journal of Physics, February 2005, Institute of Physics Publishing

    Johannes Courtial

  70. 3D interferometric optical tweezers using a single spatial light modulator

    Article • Optics Express, January 2005, Optical Society of America (OSA)

    Johannes Courtial

  71. Laser beams: Knotted threads of darkness

    Article • Nature Cell Biology, November 2004, Springer Science + Business Media

    Johannes Courtial

  72. Assembly of 3-dimensional structures using programmable holographic optical tweezers

    Article • Optics Express, November 2004, Optical Society of America (OSA)

    Johannes Courtial

  73. Increasing the data density of free-space optical communications using orbital angular momentum

    Article • October 2004, SPIE

    Johannes Courtial

  74. Semi-automated 3D assembly of multiple objects using holographic optical tweezers

    Article • October 2004, SPIE

    Johannes Courtial

  75. Three-dimensional structures in optical tweezers

    Article • October 2004, SPIE

    Johannes Courtial

  76. Uncertainty principle for angular position and angular momentum

    Article • New Journal of Physics, August 2004, Institute of Physics Publishing

    Johannes Courtial

  77. Vortex sorter for Bose-Einstein condensates

    Article • Physical Review A, July 2004, American Physical Society (APS)

    Johannes Courtial

  78. Oil and gas prospecting by ultra-sensitive optical gas detection with inverse gas dispersion modelling

    Article • Geophysical Research Letters, June 2004, American Geophysical Union (AGU)

    Johannes Courtial

  79. Transverse laser modes in Bose-Einstein condensates

    Article • Physical Review A, May 2004, American Physical Society (APS)

    Johannes Courtial

  80. Light’s Orbital Angular Momentum

    Article • Physics Today, May 2004, American Institute of Physics

    Johannes Courtial

  81. The connection of singular and nondiffracting optics

    Article • Journal of Optics A Pure and Applied Optics, April 2004, Institute of Physics Publishing

    Johannes Courtial

  82. Interactive application in holographic optical tweezers of a multi-plane Gerchberg-Saxton algorithm for three-dimensional light shaping

    Article • Optics Express, April 2004, Optical Society of America (OSA)

    Johannes Courtial

  83. 3D manipulation of particles into crystal structures using holographic optical tweezers

    Article • Optics Express, January 2004, Optical Society of America (OSA)

    Johannes Courtial

  84. Interferometric Methods to Measure Orbital and Spin, or the Total Angular Momentum of a Single Photon

    Article • Physical Review Letters, January 2004, American Physical Society (APS)

    Johannes Courtial

  85. Free-space information transfer using light beams carrying orbital angular momentum

    Article • Optics Express, January 2004, Optical Society of America (OSA)

    Johannes Courtial

  86. Classic-fractal eigenmodes of unstable canonical resonators

    Article • Optics Communications, July 2003, Elsevier

    Johannes Courtial

  87. Simplified measurement of the orbital angular momentum of single photons

    Article • Optics Communications, July 2003, Elsevier

    Johannes Courtial

  88. Fractals in pixellated video feedback

    Article • Contemporary Physics, March 2003, Taylor & Francis

    Johannes Courtial

  89. Optically controlled three-dimensional rotation of microscopic objects

    Article • Applied Physics Letters, February 2003, American Institute of Physics

    Johannes Courtial

  90. Performance of a rotating aperture for spinning and orienting objects in optical tweezers

    Article • Journal of Modern Optics, January 2003, Taylor & Francis

    Johannes Courtial

  91. Measuring the Orbital Angular Momentum of a Single Photon

    Article • Physical Review Letters, June 2002, American Physical Society (APS)

    Johannes Courtial

  92. Entanglement of orbital angular momentum for the signal and idler beams in parametric down-conversion

    Article • Journal of Modern Optics, April 2002, Taylor & Francis

    Johannes Courtial

  93. Fractal laser mode structure due to iterated diffractive multiple imaging

    Article • Journal of Modern Optics, April 2002, Taylor & Francis

    Johannes Courtial

  94. Holographic generation and orbital angular momentum of high-order Mathieu beams

    Article • Journal of Optics B Quantum and Semiclassical Optics, March 2002, Institute of Physics Publishing

    Johannes Courtial

  95. Image processing: Fractals in pixellated video feedback

    Article • Nature, December 2001, Springer Science + Business Media

    Johannes Courtial

  96. Fractal generation using optical feedback with incoherent gain

    Article • Optics Communications, April 2001, Elsevier

    Johannes Courtial

  97. Monitor-Outside-a-Monitor Effect and Self-Similar Fractal Structure in the Eigenmodes of Unstable Optical Resonators

    Article • Physical Review Letters, December 2000, American Physical Society (APS)

    Johannes Courtial

  98. Generation of self-reproducing fractal patterns using a multiple imaging system with feedback

    Article • Journal of Modern Optics, July 2000, Taylor & Francis

    Johannes Courtial

  99. Mode transformations in terms of the constituent Hermite–Gaussian or Laguerre–Gaussian modes and the variable-phase mode converter

    Article • Optics Communications, July 2000, Elsevier

    Johannes Courtial

  100. Fractal multiple reduction imaging lasers

    Article • Optics Communications, January 2000, Elsevier

    Johannes Courtial

  101. Limit to the orbital angular momentum per unit energy in a light beam that can be focussed onto a small particle

    Article • Optics Communications, January 2000, Elsevier

    Johannes Courtial

  102. Wave plates and the Pancharatnam phase

    Article • Optics Communications, December 1999, Elsevier

    Johannes Courtial

  103. The generation of Bessel beams at millimetre-wave frequencies by use of an axicon

    Article • Optics Communications, November 1999, Elsevier

    Johannes Courtial, Dr Jochen Arlt

  104. Optical angular momentum in periodic arrays

    Article • Institute of Electrical & Electronics Engineers (IEEE)

    Johannes Courtial