Optical transmission anomalies in a double-layered metallic slit array.
We theoretically predicted the existence of an anomalous optical transmittance dip, which must be observed for a metamaterial structure with two metallic slabs with cut-through slit arrays of a constant period d under a normal incident condition. By changing the relative lateral displacement l between the two slabs, the dip frequency varies across that of a so-called Rayleigh-Wood's (RW) anomaly frequency. The mechanism of this anomaly is quite different from that of the RW anomaly and interpreted in terms of the interference between the propagating and evanescent waves. For the present double-layered system, furthermore, it is suggested that the RW anomaly vanishes for l = 0 and d/2. In experiments in the terahertz region, we observe that the fundamental features agree with these theoretical predictions.
Akiyama
Koichi
K
Advanced Technology R&D Center, Mitsubishi Electric Corporation, Amagasaki, Hyogo, 661-8661, Japan. Akiyama.Koichi@cb.MitsubishiElectric.co.jp
Takano
Keisuke
K
Abe
Yuji
Y
Tokuda
Yasunori
Y
Hangyo
Masanori
M
D008670:Metals; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation*; D012542:Scattering, Radiation; D013057:Spectrum Analysis / Q000295:instrumentation*; D055053:Terahertz Radiation
D008670:Metals