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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Courtial, J. Padgett, M. Leach, J. Yao, E. Barnett, S. Franke-Arnold, S. |
| Copyright Year | 2003 |
| Description | Author affiliation: Dept. of Phys. & Astron., Glasgow Univ., UK (Courtial, J.; Padgett, M.; Leach, J.; Yao, E.) |
| Abstract | We discuss several techniques for measuring the topological charge, m, of optical vortices by utilizing their m-fold rotational symmetry. Such a measurement also amounts to a measurement of the orbital angular momentum (OAM) per photon in units of hbar. The first technique involves the rotational Doppler shift, which was recently suggested as a way to measure the OAM of light beams for optical-communications purposes. The second technique involves interfering an optical vortex with the same vortex, but rotated about the vortex axis by a certain angle. This results in constructive interference for some m values, and destructive interference for other m values. This technique can, in principle, be used to measure the OAM of individual photons. The third technique uses an optical ring resonator that rotates the beam during each round trip. Such a resonator can be tuned to be resonant only for optical vortices with a given values of m. We have used such a resonator to demonstrate an angular form of the uncertainty principle. |
| Sponsorship | IEEE LEOS Ukraine Chapter Opt. Soc. America, OSA URSI Sci. & Technol. Center in Ukraine, STCU Office of Naval Res. Int. Field Office, ORNIFO IEEE/AP/MTT/ED/AES/ GRS/NPS/EMB East Ukraine Joint Chapter IEEE Ukraine Sect. Ukrainan Chapter of SPIE |
| File Size | 48185 |
| File Format | |
| ISBN | 0780379489 |
| DOI | 10.1109/CAOL.2003.1250503 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2003-09-16 |
| Publisher Place | Ukraine |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Doppler shift Current measurement Optical vortices Optical resonators Interference Extraterrestrial measurements Optical beams Optical ring resonators Rotation measurement Charge measurement |
| Content Type | Text |
| Resource Type | Article |
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