The scattering and absorption characteristics of material-coated periodic gratings under oblique incidence

Author

Moore, John ; Ling, Hao ; Liang, Charles S.

Author_Institution

Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA

Volume

41

Issue

9

fYear

1993

fDate

9/1/1993 12:00:00 AM

Firstpage

1281

Lastpage

1288

Abstract

A boundary integral formulation is presented for calculating the scattering from material-coated periodic gratings under oblique incidence. Periodic boundary conditions and expansion of the fields in terms of Floquet harmonics allow the boundary integral formulation to treat just a single period of the infinite grating. Numerical results for an etched conducting grating designed for use at infrared wavelengths are presented and shown to be in good agreement with a series of measurements. Results for a number of dielectric gratings for both normal and oblique incidence also agree well with other published data. The conductor-backed coated grating is studied, and it is shown that the groove profile can be used to significantly alter the absorbing characteristics for lossy material coatings

Keywords

diffraction gratings; light absorption; light scattering; optical films; Floquet harmonics; absorption characteristics; boundary integral formulation; conductor-backed coated grating; dielectric gratings; etched conducting grating; groove profile; infrared wavelengths; lossy material coatings; material-coated periodic gratings; normal incidence; oblique incidence; scattering characteristics; Absorption; Boundary conditions; Conducting materials; Dielectric materials; Dielectric measurements; Etching; Gratings; Integral equations; Scattering; Wavelength measurement;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.247755

Filename

247755