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- Graham M. Gibson, Johannes Courtial, +4 authors Sonja Franke-Arnold
- Optics express
- 2004

We demonstrate the transfer of information encoded as orbital angular momentum (OAM) states of a light beam. The transmitter and receiver units are based on spatial light modulators, which prepare or measure a laser beam in one of eight pure OAM states. We show that the information encoded in this way is resistant to eavesdropping in the sense that any… (More)

- Jonathan Leach, Miles J. Padgett, Stephen M. Barnett, Sonja Franke-Arnold, Johannes Courtial
- Physical review letters
- 2002

We propose an interferometric method for measuring the orbital angular momentum of single photons. We demonstrate its viability by sorting four different orbital angular momentum states, and are thus able to encode two bits of information on a single photon. This new approach has implications for entanglement experiments, quantum cryptography and high… (More)

- Jonathan Leach, Gavin Sinclair, +4 authors Zsolt John Laczik
- Optics express
- 2004

We have developed holographic optical tweezers that can manipulate many particles simultaneously in three dimensions in order to create micro-crystal structures that extend over many tens of microns. The technique uses specific hologram-design algorithms to create structures that can be dynamically scaled or rotated about arbitrary axes. We believe the… (More)

- Miles J. Padgett, Johannes Courtial
- Optics letters
- 1999

The polarization state of a light beam is related to its spin angular momentum and can be represented on the Poincaré sphere. We propose a sphere for light beams in analogous orbital angular momentum states. Using the Poincaré-sphere equivalent, we interpret the rotational frequency shift for light beams with orbital angular momentum [Phys. Rev. Lett. 80,… (More)

- Jonathan Leach, Kurt Daniel Wulff, +8 authors Miles J. Padgett
- Applied optics
- 2006

We have developed software with an interactive user interface that can be used to generate phase holograms for use with spatial light modulators. The program utilizes different hologram design techniques, allowing the user to select an appropriate algorithm. The program can be used to generate multiple beams and can be used for beam steering. We see a major… (More)

- Gavin Sinclair, Pamela Jordan, Johannes Courtial, Miles J. Padgett, Jon M. Cooper, Zsolt John Laczik
- Optics express
- 2004

The micromanipulation of objects into 3-dimensional geometries within holographic optical tweezers is carried out using modified Gerchberg-Saxton (GS) and direct binary search (DBS) algorithms to produce the hologram designs. The algorithms calculate sequences of phase holograms, which are implemented using a spatial light modulator, to reconfigure the… (More)

- Martin P. J. Lavery, David J. Robertson, Gregorius C G Berkhout, Gordon D. Love, Miles J. Padgett, Johannes Courtial
- Optics express
- 2012

We have developed a mode transformer comprising two custom refractive optical elements which convert orbital angular momentum states into transverse momentum states. This transformation allows for an efficient measurement of the orbital angular momentum content of an input light beam. We characterise the channel capacity of the system for 50 input modes,… (More)

- Gregorius C G Berkhout, Martin P. J. Lavery, Johannes Courtial, Marco W Beijersbergen, Miles J. Padgett
- Physical review letters
- 2010

We present a method to efficiently sort orbital angular momentum (OAM) states of light using two static optical elements. The optical elements perform a Cartesian to log-polar coordinate transformation, converting the helically phased light beam corresponding to OAM states into a beam with a transverse phase gradient. A subsequent lens then focuses each… (More)

- Jonathan Leach, Johannes Courtial, Kenneth D. Skeldon, Stephen M. Barnett, Sonja Franke-Arnold, Miles J. Padgett
- Physical review letters
- 2004

We propose interferometric methods capable of measuring either the total angular momentum, or simultaneously measuring the spin and orbital angular momentum of single photons. This development enables the measurement of any angular momentum eigenstate of a single photon. The work allows the investigation of single-photon two-qubit entangled states and has… (More)

- Jonathan Leach, M R Dennis, Johannes Courtial, Miles J. Padgett
- Nature
- 2004

Destructive interference may lead to complete cancellation when light waves travelling in different directions cross, and in three-dimensional space this occurs along lines that are vortices of electromagnetic energy flow. Here we confirm theoretical predictions by experimentally creating combinations of optical laser beams in which these dark threads form… (More)