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Proceedings Paper

Multi-foci metalens for spin and orbital angular momentum interaction
Author(s): Shengtao Mei; M. Q. Mehmood; Kun Huang; Cheng-Wei Qiu
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Paper Abstract

The development of metasurface, capable of controlling wave-fronts through interfacial phase discontinuity, offers a fascinating methodology for designing two dimensional miniaturized optical devices. Owing to an additional advantage of the enhanced useful transmission via Bainet-inverted matasurface, we exploit them to demonstrate an intriguing concept of merging the phase-profiles of two distinct optical devices, a lens and a spiral phase plate, to realize an ultrathin nanostructured optical vortex lens. The proposed device can has multiple focal planes along the longitudinal direction; whereas the number of focal plans, corresponding topological charges and focal lengths can readily be tailored to meet any desired requirements. Meanwhile, the dual-polarity feature of the optical vertex metalens exhibits spin controlled real and virtual focal plans, while dispersionless aptitude of nanobars enables its working over the broadband. The concept unveils a novel way of employing metasurface, to engraft the phase profiles of multiple bulk devices, to achieve unique functionalities for promising applications in integrated photonics.

Paper Details

Date Published: 1 September 2015
PDF: 13 pages
Proc. SPIE 9544, Metamaterials, Metadevices, and Metasystems 2015, 95441J (1 September 2015); doi: 10.1117/12.2187375
Show Author Affiliations
Shengtao Mei, National Univ. of Singapore (Singapore)
M. Q. Mehmood, National Univ. of Singapore (Singapore)
Kun Huang, National Univ. of Singapore (Singapore)
Cheng-Wei Qiu, National Univ. of Singapore (Singapore)

Published in SPIE Proceedings Vol. 9544:
Metamaterials, Metadevices, and Metasystems 2015
Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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