Title :
Study of the Transmission of Subwavelength Metallic Grids in the THz Frequency Range
Author :
Armand, Damien ; Todorov, Yanko ; Garet, Frédéric ; Minot, Christophe ; Coutaz, Jean-Louis
Author_Institution :
Univ. of Savoie, Le Bourget
Abstract :
We report on the transmission of terahertz (THz) electromagnetic waves through gold grids evaporated over a transparent silicon substrate. We observe a near-unity transmission in the subwavelength regime. When the THz wavelength is comparable to the grid periodicity, the grid serves as a grating coupler that allows us to excite guided modes in the device. These guided modes exhibit an intermediate behavior between a surface plasmon mode and modes of a dielectric slab waveguide.
Keywords :
diffraction gratings; gold; light transmission; optical couplers; optical waveguides; submillimetre waves; surface plasmons; Au; THz wavelength; dielectric slab waveguide; gold grids; grating coupler; grid periodicity; guided modes; near-unity transmission; surface plasmon mode; terahertz electromagnetic waves transmission; transparent silicon substrate; Couplings; Dielectrics; Electromagnetic scattering; Frequency; Gold; Gratings; Plasmons; Silicon; Slabs; Surface waves; 1-D photonic crystal; extraordinary transmission; grating; surface plasmon (SP); terahertz (THz);
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2007.910766
