Journal article
Topology optimized mode conversion in a photonic crystal waveguide fabricated in siliconon-insulator material
Department of Photonics Engineering, Technical University of Denmark1
Nanophotonic Devices, Department of Photonics Engineering, Technical University of Denmark2
Department of Mechanical Engineering, Technical University of Denmark3
Solid Mechanics, Department of Mechanical Engineering, Technical University of Denmark4
Ultra-fast Optical Communication, Department of Photonics Engineering, Technical University of Denmark5
We have designed and for the first time experimentally verified a topology optimized mode converter with a footprint of ∼6.3 μm × ∼3.6 μm which converts the fundamental even mode to the higher order odd mode of a dispersion engineered photonic crystal waveguide. 2D and 3D topology optimization is utilized and both schemes result in designs theoretically showing an extinction ratio larger than 21 dB.
The 3D optimized design has an experimentally estimated insertion loss lower than ∼2 dB in an ∼43 nm bandwidth. The mode conversion is experimentally confirmed in this wavelength range by recording mode profiles using vertical grating couplers and an infrared camera. The experimentally determined extinction ratio is > 12 dB and is believed to be limited by the spatial resolution of our setup. © 2014 Optical Society of America.
Language: | English |
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Year: | 2014 |
Pages: | 8525-8532 |
ISSN: | 10944087 |
Types: | Journal article |
DOI: | 10.1364/OE.22.008525 |
ORCIDs: | Frandsen, Lars Hagedorn , Frellsen, Louise Floor , Ding, Yunhong , Sigmund, Ole and Yvind, Kresten |