Abstract

As artificial materials engineered to have properties that have not yet been found in nature, metamaterials enable exciting physics and technologically important capabilities ranging from negative refraction, invisibility cloaking, to super-resolution imaging, with applications across science and engineering.^[1-3] The research on metamaterials has been carried on broadly at microwave frequency and optical frequency, as well as at terahertz frequency. In the terahertz regime, the spectra response of metamaterial was usually examined and discussed in the far-field region, however, there are few works on the near-field characteristics of the metamaterial. Here, we studied the terahertz response of one kind of metamaterials, named the metasurface, by adopting the near-field scanning terahertz microcopy (NSTM) system.^[3]

© 2015 Japan Society of Applied Physics, Optical Society of America