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Resonant mixing of optical orbital and spin angular momentum by using chiral silicon nanosphere clusters

Al-Jarro, A; Biris, CG; Panoiu, NC; (2016) Resonant mixing of optical orbital and spin angular momentum by using chiral silicon nanosphere clusters. Optics Express , 24 (7) pp. 6945-6958. 10.1364/OE.24.006945. Green open access

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Abstract

We present an in-depth analysis of the resonant intermixing between optical orbital and spin angular momentum of Laguerre-Gaussian (LG) beams, mediated by chiral clusters made of silicon nanospheres. In particular, we establish a relationship between the spin and orbital quantum numbers characterizing the LG beam and the order q of the rotation symmetry group Cq of the cluster of nanospheres for which resonantly enhanced coupling between the two components of the optical angular momentum is observed. Thus, similar to the case of diffraction grating-mediated transfer of linear momentum between optical beams, we demonstrate that clusters of nanospheres that are invariant to specific rotation transformations can efficiently transfer optical angular momentum between LG beams with different quantum numbers. We also discuss the conditions in which the resonant interaction between LG beams and a chiral cluster of nanospheres leads to the generation of superchiral light.

Type: Article
Title: Resonant mixing of optical orbital and spin angular momentum by using chiral silicon nanosphere clusters
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OE.24.006945
Publisher version: http://dx.doi.org/10.1364/OE.24.006945
Language: English
Additional information: Copyright © 2016 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited
UCL classification: UCL
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/1485625
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