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Open AccessArticle

Broadband Multichannel Optical Vortex Generators via Patterned Double-Layer Reverse-Twist Liquid Crystal Polymer

by 1, 1,2,*, 1, 1 and 1,*
1
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
2
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China
*
Authors to whom correspondence should be addressed.
Crystals 2020, 10(10), 882; https://doi.org/10.3390/cryst10100882
Received: 31 August 2020 / Revised: 22 September 2020 / Accepted: 27 September 2020 / Published: 29 September 2020
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. View Full-Text
Keywords: beam shaping; liquid crystals; orbital angular momentum; geometric phase beam shaping; liquid crystals; orbital angular momentum; geometric phase
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MDPI and ACS Style

Zhang, H.; Duan, W.; Wei, T.; Xu, C.; Hu, W. Broadband Multichannel Optical Vortex Generators via Patterned Double-Layer Reverse-Twist Liquid Crystal Polymer. Crystals 2020, 10, 882. https://doi.org/10.3390/cryst10100882

AMA Style

Zhang H, Duan W, Wei T, Xu C, Hu W. Broadband Multichannel Optical Vortex Generators via Patterned Double-Layer Reverse-Twist Liquid Crystal Polymer. Crystals. 2020; 10(10):882. https://doi.org/10.3390/cryst10100882

Chicago/Turabian Style

Zhang, Hanqing; Duan, Wei; Wei, Ting; Xu, Chunting; Hu, Wei. 2020. "Broadband Multichannel Optical Vortex Generators via Patterned Double-Layer Reverse-Twist Liquid Crystal Polymer" Crystals 10, no. 10: 882. https://doi.org/10.3390/cryst10100882

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