High-order spoof localized surface plasmons supported on a complementary metallic spiral structure

• Main Authors: Gao, Zhen, Gao, Fei, Zhang, Baile
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2017
• Subjects: Sub-wavelength Optics; Metamaterials
• Online Access: https://hdl.handle.net/10356/83890; http://hdl.handle.net/10220/42855
• Institution: Nanyang Technological University

We experimentally demonstrate that multiple high-order spoof localized surface plasmons (spoof-LSPs) modes can be supported on a complementary metallic spiral structure, which were absent in the previously reported spoof-LSPs modes. Through exact numerical simulations and near-field imaging experiments, we directly observe these high-order spoof-LSPs modes at microwave frequencies. We also show that these higher-order spoof-LSPs modes exhibit larger frequency shifts caused by the local environmental refractive index change than the previously reported low-order spoof-LSPs modes. Hence the complementary MSS may find potential applications as plasmonic sensor in the microwave and terahertz frequencies.