Gallacher, K. , Griffin, P. F., Riis, E., Sorel, M. and Paul, D. J. (2022) Silicon nitride waveguide polarization rotator and polarization beam splitter for chip-scale atomic systems. APL Photonics, 7(4), 046101. (doi: 10.1063/5.0077738)
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Abstract
The design, fabrication, and characterization of a silicon nitride waveguide polarization rotator and polarization beam splitter that operate with a polarization extinction ratio (PER) of ∼30 dB at the rubidium atomic transition of 780 nm wavelength are demonstrated. These polarization devices are fabricated on the same chip using a self-aligned process for integration of the rib and ridge waveguide structures. The polarization rotator is based on the mode evolution approach using adiabatic tapers and demonstrates a PER of ≥20 dB over a 100 nm bandwidth (730–830 nm wavelengths) with an insertion loss (IL) ≤1 dB. The polarization beam splitter is based on a cascaded tapered asymmetric directional coupler with phase matching between the fundamental and higher order TM modes, whereas the TE mode is separated by the through port. This provides a PER ≥ 20 dB with IL ≤ 1 dB over a 50 nm bandwidth for the cross port and a PER ≥ 15 dB with an IL ≤ 1 dB over an 18 nm bandwidth for the through port. These polarization control waveguide devices will enable photonic integrated circuits for saturated absorption spectroscopy of atomic vapors for laser stabilization on-chip.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Gallacher, Dr Kevin and Paul, Professor Douglas and Sorel, Professor Marc |
| Authors: | Gallacher, K., Griffin, P. F., Riis, E., Sorel, M., and Paul, D. J. |
| College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
| Journal Name: | APL Photonics |
| Publisher: | AIP Publishing |
| ISSN: | 2378-0967 |
| ISSN (Online): | 2378-0967 |
| Published Online: | 01 April 2022 |
| Copyright Holders: | Copyright © Author(s) 2022 |
| First Published: | First published in APL Photonics 7(4):046101 |
| Publisher Policy: | Reproduced under a Creative Commons Licence |
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