A Zeroth-Order Modification of Coupled Mode Theory for Waveguide Gratings

Author

Kamali, Seyedeh Mahsa ; Arbabi, Ehsan ; Goddard, Lynford L.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Illinois at Urbana-Champaign, Urbana, IL, USA

Volume

27

Issue

7

fYear

2015

fDate

April1, 1 2015

Firstpage

790

Lastpage

793

Abstract

This letter demonstrates the importance of selecting the correct unperturbed structure for coupled mode theory calculations of waveguide gratings. Neglecting the spatial dependence of the average value of the perturbation can cause considerable inaccuracies in the analysis of many common structures. Here, we show the improvement that can be achieved by including this zeroth-order modification and how to choose the proper unperturbed structure through several practical device examples.

Keywords

coupled mode analysis; diffraction gratings; optical waveguide theory; coupled mode theory; unperturbed structure; waveguide gratings; zeroth-order modification; Distributed Bragg reflectors; Finite element analysis; Gratings; Optical waveguides; Solid modeling; Three-dimensional displays; Bragg gratings; Computational; Computational electromagnetics; Distributed feedback devices; Optical Waveguides; distributed feedback devices; electromagnetics; optical waveguides;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2015.2392626

Filename

7010020