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Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China
Anomalous microwave reflection from a metal surface induced by spoof surface plasmon
Wang Liang,Cao Jinxiang *
Key Laboratory of Basic Plasma Physics of Chinese Academy of Sciences and Department of Modern Physics, University of Science and Technology of China, HeFei 230026
The reflection of X-band microwaves (8-12 GHz) from a metallic aluminum (Al) surface with groove grating corrugations was investigated experimentally. It was shown that the reflection of p-polarization is much less than the microwave reflected from the corresponding area of an unruled Al surface, with selective wavelength. The experimental results demonstrated that the anomalous microwave reflection is strongly associated with the excitation of spoof surface plasmons at the Al-air interface by the surface grating coupler. This near-total absence of reflected microwaves is similar to the famous Wood's anomaly in the optical regime and is of fundamental importance to the applications of spoof surface plasmons in the microwave regime.
Keywords:spoof surface plasmons; anomalous reflection; metal surface