Coupling of free space sub-terahertz waves into dielectric slabs using PC waveguides.
The paper presents theoretical and experimental results on photonic crystal structures which work under the self-collimation condition to couple free space waves into dielectric slabs in the sub-terahertz range. Using a standard machining process, two-dimensional photonic crystal structures consisting of a square array of air holes in the dielectric medium are fabricated. One of the structures has two adjacent parallel line-defects that improve the coupling efficiency. This leads to a combination of self-collimation and directional emission of electromagnetic waves. The experimental results are in good agreement with those of the Finite- Element-Method calculations. Experimentally we achieve a coupling efficiency of 63%.
Ghattan
Z
Z
Institut für Hochfrequenztechnik, Technische Universität Braunschweig,Schleinitzstrasse 22, D-38106 Braunschweig, Germany. zahra.ghattan@ihf.tu-bs.de
Hasek
T
T
Shahabadi
M
M
Koch
M
M
D003198:Computer Simulation; D003461:Crystallography; D004560:Electricity; D017785:Photons