Resonant field enhancement of terahertz waves in subwavelength plasmonic structures
R. Singh and A.K. Azad, Los Alamos National Laboratory, USA
W. Zhang, Oklahoma State University, USA
Abstract:
Resonant terahertz field enhancement is investigated in arrays of subwavelength holes patterned on metals, semiconductors and superconductors. The effects of array film thickness, the dielectric function of metals, and a dielectric overlayer were investigated by the state-of-the-art terahertz spectroscopy. Extraordinary terahertz transmission was demonstrated in arrays of subwavelength holes made even from Pb, generally a poor metal, and having optically thin thicknesses less than one-third of a skin depth. We also demonstrate active control ...
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