Fano profiles in transmission spectra of terahertz radiation through one-dimensional periodic metallic structures

摘要

The transmission properties of broadband terahertz radiation through one-dimensional periodicnmetallic structures are investigated experimentally, and the obtained results are explainedntheoretically. Characteristic minima known as Wood’s anomalies are observed in the transmissionnspectra. The measured line shapes, the so-called Fano profiles, are caused by the coupling betweennresonant surface plasmons excited on the metallic grating and nonresonant diffraction orders.nNumerical simulations using classical electrodynamics are in good agreement with thenexperiments. © 2010 American Institute of Physics. u0004doi:10.1063/1.3526756