Magnetically and electrically polarization-tunable THz emitter with integrated ferromagnetic heterostructure and large-birefringence liquid crystal. (2nd August 2018)

• Record Type: Journal Article
• Authors: Qiu, Hongsong; Wang, Lei; Shen, Zhixiong; Kato, Kosaku; Sarukura, Nobuhiko; Yoshimura, Masashi; Hu, Wei; Lu, Yanqing; Nakajima, Makoto
• Is Part Of: Applied physics express. Volume 11:Number 9(2018)
• Publication Date: 2018-08-02
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.11.092101
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: A magnetically and electrically polarization-tunable terahertz emitter that integrates a ferromagnetic heterostructure and large-birefringence liquid crystals is demonstrated. The heterostructure and the liquid crystal cell act as the broadband terahertz source and the phase retarder, respectively. The polarization state is switched between linear and circular by changing the direction of the external magnetic field. The phase retardation for frequencies higher than 1 THz is continuously adjustable over a range of π/2 by applying a low voltage. This compact, broadband, economical, and easy-to-regulate terahertz emitter can be widely used in polarization-sensitive research and engineering applications.