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Generation of Orbital Angular Momentum by a Point Defect in Photonic Crystals

Chen, MLN; Jiang, LJ; Sha, WEI; (2018) Generation of Orbital Angular Momentum by a Point Defect in Photonic Crystals. Physical Review Applied , 10 (1) , Article 014034. 10.1103/PhysRevApplied.10.014034. Green open access

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Abstract

As an attractive degree of freedom in electromagnetic (EM) waves, the orbital angular momentum (OAM) enables infinite communication channels for both classical and quantum communications. The exploration of OAM generation inspires various designs involving spiral phase plates, antenna arrays, metasurfaces, and computer-generated holograms. In this work, we theoretically and experimentally demonstrate an approach to producing OAM carrying EM waves by a point defect in three-dimensional (3D) photonic crystals (PCs). Simultaneous excitation of two vibrational-defect states with an elaborately engineered phase retardation generates a rotational state carrying OAM. Through converting guided waves in a line defect to localized waves in a point defect and then to radiated vortex waves in free space, the lowest four OAM-mode emitters, i.e., OAM indices of ± 1 and ± 2 , are successfully realized. This work offers a physical mechanism to generate OAM by PCs, especially when the OAM generation is to be integrated with other designs.

Type: Article
Title: Generation of Orbital Angular Momentum by a Point Defect in Photonic Crystals
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevApplied.10.014034
Publisher version: https://doi.org/10.1103/PhysRevApplied.10.014034
Language: English
Additional information: This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10055080
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