254 citations · 960 across the 23 of their papers we have counts for
17 papers · 1 filter
Fractal light from lasers
Hend Sroor, Darryl Naidoo, Steven W. Miller +3
Fractals, complex shapes with structure at multiple scales, have long been observed in Nature: as symmetric fractals in plants and sea shells, and as statistical fractals in clouds…
Three-dimensional, self-similar, light in unstable canonical optical resonators
Steven W. Miller, John Nelson, Johannes Courtial
The eigenmodes of unstable canonical optical resonators possess fractal structure in their transverse intensity cross-sections [Karman et al., Nature 402, 138 (1999)]. In one parti…
Perfect imaging with planar interfaces
Stephen Oxburgh, Johannes Courtial
We describe the most general homogenous, planar, light-ray-direction-changing sheet that performs one-to-one imaging between object space and image space. This is a non-trivial spe…
Law of refraction for generalised confocal lenslet arrays
Stephen Oxburgh, Chris D. White, Georgios Antoniou +1
We derive the law of generalised refraction for generalised confocal lenslet arrays, which are arrays of misaligned telescopes. We have implemented this law of refraction in TIM, a…
Quantifying metarefraction with confocal lenslet arrays
Tautvydas Maceina, Gediminas Juzeliunas, Johannes Courtial
METATOYs can change the direction of light in ways that appear to, but do not actually, contravene the laws of wave optics. This direction change applies only to part of the transm…
TIM, ray-tracing program for forbidden optics
Dean Lambert, Alasdair C. Hamilton, George Constable +3
TIM (The Interactive METATOY) is a ray-tracing program specifically tailored towards our research in METATOYs, which are optical components that appear to be able to create wave-op…
Experimental demonstration of a light-ray-direction-flipping METATOY based on confocal lenticular arrays
Michael Blair, Leo Clark, E. Alasdair Houston +4
We show, theoretically and experimentally, that a sheet formed by two confocal lenticular arrays can flip one component of the local light-ray direction. Ray-optically, such a shee…
Standard and non-standard metarefraction with confocal lenslet arrays
Johannes Courtial
A recent paper demonstrated that two lenslet arrays with focal lengths f_1 and f_2, separated by f_1 + f_2, change the direction of transmitted light rays approximately like the in…
Generalized refraction using lenslet arrays
Alasdair C. Hamilton, Johannes Courtial
We have recently started to investigate 2D arrays of confocal lens pairs. Miniaturization of the lens pairs can make the array behave ray-optically like a homogeneous medium. Here…
Geometric limits to geometric optical imaging with infinite, planar, non-absorbing sheets
Johannes Courtial
New ray-optical elements allow generalized refraction of light rays, but geometry imposes limitations on possible mappings between the positions of an object and its geometric imag…
Superoscillation in speckle patterns
Mark R. Dennis, Alasdair C. Hamilton, Johannes Courtial
Waves are superoscillatory where their local phase gradient exceeds the maximum wavenumber in their Fourier spectrum. We consider the superoscillatory area fraction of random optic…
Metamaterials for light rays: ray optics without wave-optical analog in the ray-optics limit
Alasdair C. Hamilton, Johannes Courtial
Volumes of sub-wavelength electromagnetic elements can act like homogeneous materials: metamaterials. In analogy, sheets of optical elements such as prisms can act ray-optically li…
Fermat's principle with complex refractive indices and local light-ray rotation
Bhuvanesh Sundar, Alasdair C. Hamilton, Johannes Courtial
We describe local light-ray rotation in terms of complex refractive indices. We show that Fermat's principle holds, and we derive an extended Snell's law. The change in the angle o…
Imaging with parallel ray-rotation sheets
Alasdair C. Hamilton, Johannes Courtial
A ray-rotation sheet consists of miniaturized optical components that function - ray optically - as a homogeneous medium that rotates the local direction of transmitted light rays…
Local light-ray rotation
Alasdair C. Hamilton, Bhuvanesh Sundar, John Nelson +1
We present a sheet structure that rotates the local ray direction through an arbitrary angle around the sheet normal. The sheet structure consists of two parallel Dove-prism sheets…
Fourier relationship between angular position and optical orbital angular momentum
Eric Yao, Sonja Franke-Arnold, Johannes Courtial +2
We demonstrate the Fourier relationship between angular position and angular momentum for a light mode. In particular we measure the distribution of orbital angular momentum states…
Vortex knots in light
J. Leach, M. R. Dennis, J. Courtial +1
Optical vortices generically arise when optical beams are combined. Recently, we reported how several laser beams containing optical vortices could be combined to form optical vort…