Orbital angular momentum
US9103975B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2013 |
| Grant date | Aug 11, 2015 |
| Priority date | — |
| Expiry date | May 29, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/12007
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to methods, devices, systems and uses of such systems for the generation and detection of electromagnetic fields carrying orbital angular momentum. An electromagnetic wave placed in a resonator having a closed-loop waveguide supporting a guided wave propagating at resonance with angular order, p, and with an angular grating patterned in the closed-loop waveguide, the angular grating having a integer number, q, of grating elements. The angular grating selectively couples the guided wave mode to a free space radiation mode having an OAM quantity, l, and out-of-plane wave vector component, krad,z, and wherein significant coupling to the grating occurs only when the following wave matching condition is satisfied: l=p−mq where: m is the diffraction order of the angular grating, m=1, 2, 3, . . . ,.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.