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Here, we demonstrate the possibility of employing a novel low-loss dielectric material as substrate for free-space THz devices through the design, fabrication and characterization of broadband high-transparency high-pass mesh filters. Time-domain spectroscopy measurements show that a transmittance higher than 75% is achieved over a bandwidth of 1 THz.
High-transmissivity left/right-handed metamaterials were fabricated in a multilayered dielectric/hole metal array technology and experimentally assessed at sub-millimeter wave lengths. From the frequency dependence of the scattering parameters, we show the possibility to close the gap between the left- and right-handed dispersion branches.
Bragg reflection of THz surface plasmon (SP) on a grating is studied using SP broadband excitation by a prism. The SP spectra transmitted by the grating exhibit minima thanks to the Bragg effect, while the reflected signals show corresponding peaks. Reflection efficiency and bandwidth of these Bragg zones are studied for different grating groove shapes and experimental schemes.
We present a study of terahertz surface plasmon excitation and propagation on a periodical metallic surface (grating), which includes the development of: 1) grating couplers, 2) curved groove gratings for surface plasmon focusing, 3) Bragg gratings for retro- and non-collinear reflection of surface plasmon.
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...
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