Fourier gratings as submillimeter beam splitters

Author

Graf, Urs U. ; Heyminck, Stefan

Author_Institution

I. Phys. Inst., Koln Univ., Germany

Volume

49

Issue

4

fYear

2001

fDate

4/1/2001 12:00:00 AM

Firstpage

542

Lastpage

546

Abstract

Over the past years, a number of groups have developed phase gratings as local oscillator beam multiplexers for array receivers in the submillimeter wavelength domain. The most popular type of grating is the Dammann (1977) grating, a simple and versatile binary phase grating. We introduce a new type of grating, the Fourier grating, which, in contrast to the binary structure of Dammann gratings, uses a smooth grating structure. Due to the lack of sharp edges these gratings can be manufactured with high precision as reflection gratings even for two-dimensional (2-D) dispersion. Fourier gratings are designed using a simple optimization procedure that only involves a small number of parameters. Their diffraction efficiency is very high. We have produced a number of gratings and tested them at a frequency of 490 GHz, verifying the theoretical results

Keywords

diffraction gratings; optical beam splitters; optimisation; 2D dispersion; 490 GHz; Dammann grating; EHF; Fourier gratings; array receivers; binary phase grating; diffraction efficiency; local oscillator beam multiplexers; optimization; phase gratings; reflection gratings; smooth grating structure; submillimeter beam splitters; submillimeter wavelength domain; Design optimization; Diffraction; Gratings; Local oscillators; Manufacturing; Multiplexing; Optical reflection; Phased arrays; Testing; Two dimensional displays;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.923313

Filename

923313