Abstract
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.
Highlights
We experimentally demonstrate that multiple high-order spoof localized surface plasmons modes can be supported on a complementary metallic spiral structure, which were absent in the previously reported spoof-LSPs modes
We show that complementary metallic spiral structure (MSS) can support multiple high-order spoof-LSPs modes and Babinet’s principle[20] is applicable to both the fundamental and high-order spoof-LSPs modes
Similar to the fundamental spoof-LSPs modes previously reported for complementary MSS19, these plots show that the first resonant mode (M1) is due to the magnetic LSPs, while the second peak (M2) emerges from the electric LSPs
Summary
We experimentally demonstrate that multiple high-order spoof localized surface plasmons (spoofLSPs) modes can be supported on a complementary metallic spiral structure, which were absent in the previously reported spoof-LSPs modes. It is interesting if there exist high-order modes of spoof-LSPs on complementary MSS following the Babinet’s principle[20].
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