Premium
Reconfigurable Terahertz Metasurface Pure Phase Holograms
Author(s) -
Guo Jinying,
Wang Teng,
Zhao Huan,
Wang Xinke,
Feng Shengfei,
Han Peng,
Sun Wenfeng,
Ye Jiasheng,
Situ Guohai,
Chen HouTong,
Zhang Yan
Publication year - 2019
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201801696
Subject(s) - terahertz radiation , optics , wavefront , holography , resonator , optoelectronics , materials science , wafer , femtosecond , modulation (music) , phase modulation , laser , physics , acoustics , phase noise
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.