Multifunctional Liquid Crystal Device for Grayscale Pattern Display and Holography with Tunable Spectral‐Response. Issue 3 (23rd January 2022)

• Record Type: Journal Article
• Authors: Chen, Kuixian; Xu, Chunting; Zhou, Zhou; Li, Zile; Chen, Peng; Zheng, Guoxing; Hu, Wei; Lu, Yanqing
• Is Part Of: Laser & photonics reviews. Volume 16:Issue 3(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-23
• Subjects: holography -- light manipulations -- liquid crystals -- orientation degeneracy -- tunable spectral response; Lasers -- Periodicals; Photonics -- Periodicals; Lasers -- Périodiques; Photonique -- Périodiques; 621.36
• DOI: 10.1002/lpor.202100591
• Languages: English
• ISSNs: 1863-8880

Abstract

Abstract: Conventional liquid‐crystal (LC) devices can only realize a single‐manipulation of optical amplitude or phase, which hinders the development of LC devices toward ultracompact multifunctional integration. Herein, it is shown LC devices can be readily extended to multifunctional ones without the cost of complex design and fabrication. Specifically, by combining Pancharatnam–Berry phase with orientation‐degeneracy implied in Malus's law, each operation‐unit of LC devices can manipulate the amplitude and phase of incident light separately, representing a new paradigm for designing innovative LC devices. A multifunctional LC device which can display a grayscale pattern right at the surface of LC, while simultaneously project an independent phase‐only holographic image in the far‐field is experimentally demonstrated. More interestingly, with the LC directors tilted with external applied voltages, a new degree‐of‐freedom is provided to modulate the spectral‐response of LC devices, contributing to the distinct function of optical switch. Owing to these unique characteristics of dual‐manipulations and spectrum‐tunability, the proposed multifunctional LCs have promising prospects in information multiplexing, optical communications, spectral measurements, etc. Abstract : Enabled by Pancharatnam–Berry phase and orientation degeneracy implied in Malus's law, a multifunctional liquid‐crystal device is proposed to separately manipulate optical intensity and phase, corresponding to the dual‐functions of simultaneous grayscale pattern display and holography. Furthermore, the spectral‐response of the multifunctional liquid‐crystal device can be dynamically modulated via the applied voltages, presenting the potential for optical switch.