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- Title
Broadband Multichannel Optical Vortex Generators via Patterned Double-Layer Reverse-Twist Liquid Crystal Polymer.
- Authors
Zhang, Hanqing; Duan, Wei; Wei, Ting; Xu, Chunting; Hu, Wei
- Abstract
The capacity of an optical communication system can be greatly increased by using separate orbital angular momentum (OAM) modes as independent channels for signal transmission and encryption. At present, a transmissive OAM mode generator compatible with wavelength division multiplexing is being highly pursued. Here, we introduce a specific double-layer reverse-twist configuration into liquid crystal polymer (LCP) to overcome wavelength dependency. With this design, broadband-applicable OAM array generators are proposed and demonstrated. A Damman vortex grating and a Damman q-plate were encoded via photopatterning two subsequent LCP layers adopted with oppositely handed chiral dopants. Rectangular and hexagonal OAM arrays with mode conversion efficiencies exceeding 40.1% and 51.0% in the ranges of 530 to 930 nm, respectively, are presented. This provides a simple and broadband efficient strategy for beam shaping.
- Subjects
POLYMER liquid crystals; OPTICAL vortices; VORTEX generators; WAVELENGTH division multiplexing; OPTICAL communications; ANGULAR momentum (Mechanics); LIQUID crystals; GEOMETRIC quantum phases
- Publication
Crystals (2073-4352), 2020, Vol 10, Issue 10, p882
- ISSN
2073-4352
- Publication type
Article
- DOI
10.3390/cryst10100882