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

Volume

5

Issue

4

fYear

2015

fDate

7/1/2015 12:00:00 AM

Firstpage

573

Lastpage

583

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;

fLanguage

English

Journal_Title

Terahertz Science and Technology, IEEE Transactions on

Publisher

ieee

ISSN

2156-342X

Type

jour

DOI

10.1109/TTHZ.2015.2439511

Filename

7152993