Wang Xinke, Wang Sen, Sun Wenfeng, Feng Shengfei, Han Peng, Yan Haitao, Ye Jiasheng, Zhang Yan
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.
Department of Physics, Harbin Institute of Technology, Harbin, 150001, P.R. China.
Sci Rep. 2016 Jan 5;6:18768. doi: 10.1038/srep18768.
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.
在太赫兹（THz）波段利用表面等离子体激元器件（SPD）始终有利于拓宽太赫兹技术的应用潜力。为了阐明SPD的特性，一种实用的表征手段对于准确观察太赫兹表面波（TSW）的复杂场分布至关重要。在此，采用太赫兹数字全息成像系统来相干地展示由金属箔上的矩形或半圆形狭缝结构激发的TSW的时间变化和光谱特性。全面阐明了成像系统的优势，包括对TSW的独家测量以及时间消耗的减少。实验过程的数值模拟进一步验证了成像测量的准确性。可以预期，该成像系统将为分析SPD的性能和原理提供一种通用工具。
