Reconfigurable Terahertz Metasurface Pure Phase Holograms. Issue 10 (6th March 2019)

• Record Type: Journal Article
• Authors: Guo, Jinying; Wang, Teng; Zhao, Huan; Wang, Xinke; Feng, Shengfei; Han, Peng; Sun, Wenfeng; Ye, Jiasheng; Situ, Guohai; Chen, Hou‐Tong; Zhang, Yan
• Is Part Of: Advanced optical materials. Volume 7:Issue 10(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-03-06
• Subjects: holograms -- optical pump -- phase modulation -- reconfigurable metasurfaces -- terahertz; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.201801696
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Terahertz (THz) radiation has many potential applications. However, comparing with the rapid development of THz sources and detectors, functional devices for THz modulation, especially the spatial modulation devices, are still insufficient. Here, a novel approach for generating arbitrary wavefronts of a THz beam is presented. By dynamically creating metasurface structures through illuminating a thin silicon wafer with femtosecond laser, which is spatially modulated, an array of reconfigurable subwavelength resonators is generated. The wavefront of the THz beam is then determined by forming spatial profiles of the Pancharatnam–Berry scattering phase by dynamically controlling the resonator orientation. Proof‐of‐concept experiments demonstrate that streaming holographic images and lenses of variable focal length can be realized in real time. The reconfigurable scheme demonstrated here is convenient and fast, and may lead to advances in a host of THz applications. Abstract : A novel approach for generating arbitrary wavefronts of a terahertz (THz) beam is presented. By dynamically creating metasurface structures through illuminating a thin silicon wafer, the phase of the THz beam is then determined by spatial profiles of illuminating patterns. Streaming holographic images and lenses of variable focal length are realized in real time.