Gibson, G., Courtial, J. , Padgett, M. J. , Vasnetsov, M., Pas'ko, V., Barnett, S. M. and Franke-Arnold, S. (2004) Free-space information transfer using light beams carrying orbital angular momentum. Optics Express, 12(22), pp. 5448-5456. (doi: 10.1364/OPEX.12.005448)
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Publisher's URL: http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-22-5448
Abstract
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 attempt to sample the beam away from its axis will be subject to an angular restriction and a lateral offset, both of which result in inherent uncertainty in the measurement. This gives an experimental insight into the effects of aperturing and misalignment of the beam on the OAM measurement and demonstrates the uncertainty relationship for OAM.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Courtial, Dr Johannes and Padgett, Professor Miles and Franke-Arnold, Professor Sonja |
| Authors: | Gibson, G., Courtial, J., Padgett, M. J., Vasnetsov, M., Pas'ko, V., Barnett, S. M., and Franke-Arnold, S. |
| Subjects: | Q Science > QC Physics |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Optics Express |
| Publisher: | Optical Society of America |
| ISSN: | 1094-4087 |
| ISSN (Online): | 1094-4087 |
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