Experimental demonstration of high-order magnetic localized spoof surface plasmons

• Main Authors: Gao, Fei, Zhang, Youming, Shi, Xihang, Yang, Zhaoju, Zhang, Baile, Gao, Zhen
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2015
• Online Access: https://hdl.handle.net/10356/99991; http://hdl.handle.net/10220/38672
• Institution: Nanyang Technological University

We experimentally demonstrate that an ultrathin metallic spiral structure is able to support multiple high-order magnetic localized spoof surface plasmons (LSSPs), which were absent in previously reported magnetic LSSPs. Near-field response spectra and near-field mapping are performed in the microwave regime to confirm this phenomenon. We also show that the high-order magnetic LSSPs are more sensitive to the surrounding refractive index change than the previously reported magnetic dipole mode. Our study may be useful in electromagnetic near-field sensing from microwave to infrared frequencies.