title: Visualization of terahertz surface waves propagation on metal foils.
abstract: Exploitation of surface plasmonic devices (SPDs) in the terahertz (THz) band is always beneficial for broadening the application potential of THz technologies. To clarify features of SPDs, a practical characterization means is essential for accurately observing the complex field distribution of a THz surface wave (TSW). Here, a THz digital holographic imaging system is employed to coherently exhibit temporal variations and spectral properties of TSWs activated by a rectangular or semicircular slit structure on metal foils. Advantages of the imaging system are comprehensively elucidated, including the exclusive measurement of TSWs and fall-off of the time consumption. Numerical simulations of experimental procedures further verify the imaging measurement accuracy. It can be anticipated that this imaging system will provide a versatile tool for analyzing the performance and principle of SPDs.
authors.affiliation: Department of Physics, Capital Normal University, Beijing Key Laboratory of Metamaterials and Devices, and Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing, 100048, P.R. China.
authors.forename: Xinke
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Physics, Harbin Institute of Technology, Harbin, 150001, P.R. China.
authors.forename: Sen
authors.initials: S
authors.lastname: Wang
authors.affiliation: Department of Physics, Capital Normal University, Beijing Key Laboratory of Metamaterials and Devices, and Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing, 100048, P.R. China.
authors.forename: Wenfeng
authors.initials: W
authors.lastname: Sun
authors.affiliation: Department of Physics, Capital Normal University, Beijing Key Laboratory of Metamaterials and Devices, and Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing, 100048, P.R. China.
authors.forename: Shengfei
authors.initials: S
authors.lastname: Feng
authors.affiliation: Department of Physics, Capital Normal University, Beijing Key Laboratory of Metamaterials and Devices, and Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing, 100048, P.R. China.
authors.forename: Peng
authors.initials: P
authors.lastname: Han
authors.affiliation: Department of Physics, Capital Normal University, Beijing Key Laboratory of Metamaterials and Devices, and Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing, 100048, P.R. China.
authors.forename: Haitao
authors.initials: H
authors.lastname: Yan
authors.affiliation: Department of Physics, Capital Normal University, Beijing Key Laboratory of Metamaterials and Devices, and Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing, 100048, P.R. China.
authors.forename: Jiasheng
authors.initials: J
authors.lastname: Ye
authors.affiliation: Department of Physics, Capital Normal University, Beijing Key Laboratory of Metamaterials and Devices, and Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing, 100048, P.R. China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang