A study of high-index-contrast 90° waveguide bend structures

R. L. Espinola*, R. U. Ahmad, F. Pizzuto, M. J. Steel, R. M. Osgood

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Citations (Scopus)


We present an evaluation of the parameters involved in designing low-loss right-angle waveguide bends based on a high index contrast materials system. We apply the finite difference time domain method (FDTD) to several two-dimensional bend structures and study the effects of varying the bend geometry. Such a study is relevant for the understanding of bend mechanisms and for the optimization and fabrication of high-density high-contrast integrated optical components. The study indicates that high bend transmission can be achieved with the addition of a low-Q resonant cavity; however, similar or even better performance can be achieved with a structure that combines a corner mirror with a phase retarder. The use of a double corner mirror structure is shown to further increase the bend transmission, with little increase in bend area.

Original languageEnglish
Pages (from-to)517-528
Number of pages12
JournalOptics Express
Issue number9
Publication statusPublished - 2001
Externally publishedYes


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