Resonant frequency tuning of terahertz plasmonic structures based on solid immersion method

We report on a technique for resonant frequency tuning and miniaturization of a terahertz (THz) plasmonic structure. By applying solid immersion method to a non- concentric plasmonic structure, we achieved resonant frequency tuning of THz plasmon and size reduction by 1/3.41 simultaneously. These results potentially lead to high-resolution THz analysis for bio-medical examination and nano-materials characterization.