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Phase-engineered metalenses to generate converging and non-diffractive vortex beam carrying orbital angular momentum in microwave region

Optics express, 2018-01, Vol.26 (2), p.1351-1360 [Peer Reviewed Journal]

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Title:
Phase-engineered metalenses to generate converging and non-diffractive vortex beam carrying orbital angular momentum in microwave region
Author: Zhang, Kuang ; Yuan, Yueyi ; Zhang, Dawei ; Ding, Xumin ; Ratni, Badreddine ; Burokur, Shah Nawaz ; Lu, Manjun ; Tang, Kun ; Wu, Qun
Is Part Of: Optics express, 2018-01, Vol.26 (2), p.1351-1360
Description: In this paper, ultra-thin metalenses are proposed to generate converging and non-diffractive vortex beam carrying orbital angular momentum (OAM) in microwave region. Phase changes are introduced to the transmission cross-polarized wave by tailoring spatial orientation of Pancharatnam-Berry phase unit cell. Based on the superposition of phase profile of spiral phase plate and that of a converging lens or an axicon, vortex beam carrying OAM mode generated by the metalens can also exhibit characteristics of a focusing beam or a Bessel beam. Measured field intensities and phase distributions at microwave frequencies verify the theoretical design procedure. The proposed method provides an efficient approach to control the radius of vortex beam carrying OAM mode in microwave wireless applications for medium-short range distance.
Publisher: United States
Language: English
Identifier: EISSN: 1094-4087
DOI: 10.1364/OE.26.001351
PMID: 29402010
Source: GFMER Free Medical Journals
Alma/SFX Local Collection
ROAD: Directory of Open Access Scholarly Resources
DOAJ Directory of Open Access Journals

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