1.
Opt Lett
; 44(8): 1960-1963, 2019 Apr 15.
Article
in English
| MEDLINE
| ID: mdl-30985785
ABSTRACT
We report on a novel photonic polarization rotator design obtained by multilevel shape optimization. The numerical method consists of a topological optimization scheme, improving iteratively the efficiency of the component by modifying its shape on two discrete levels along the etching direction. We numerically show that, compared to state-of-the-art single-level shape optimization, the performances can be drastically improved for a given device length. Next, the polarization conversion efficiency can be further improved up to a computed value of 98.5% with less than 0.35 dB insertion losses on a 100 nm bandwidth for a 6 µm×1 µm footprint.