Title :
Fourier Optics for the Analysis of Distributed Absorbers Under THz Focusing Systems
Author :
Llombart, Nuria ; Blazquez, Beatriz ; Freni, Angelo ; Neto, Andrea
Author_Institution :
Terahertz Sensing Group, Tech. Univ. of Delft, Delft, Netherlands
fDate :
7/1/2015 12:00:00 AM
Abstract :
An analytical spectral model able to accurately and efficiently characterize absorbers distributed in the focal plane of focusing THz systems is presented. The model is obtained by using a Fourier optics representation of the electromagnetic field in the focal plane in conjunction with a recently developed equivalent network representation for the interaction of plane waves with distributed absorbers. The model is validated by comparisons with numerical full-wave simulations. Finally, the model is used to design a few architectures based on lens-coupled Kinetic Inductance Detectors (KIDs), which show high absorption efficiency over a large bandwidth.
Keywords :
Fourier transform optics; electromagnetic fields; focal planes; lenses; terahertz wave detectors; Fourier optics; THz focusing systems; analytical spectral model; bandwidth; distributed absorber analysis; distributed absorbers; electromagnetic field; equivalent network representation; focal plane; high absorption efficiency; lens-coupled kinetic inductance detectors; numerical full-wave simulation; plane wave interaction; Dielectrics; Focusing; Geometry; Lenses; Strips; Surface waves; Focusing systems; Fourier optics; THz absorbers;
Journal_Title :
Terahertz Science and Technology, IEEE Transactions on
DOI :
10.1109/TTHZ.2015.2439511
