All polarization rotators base on the same fundamental alignment of a quarter-wave-plate (QWP), which transforms an arbitrary input state of polarization into a linear one, followed by a halve-wave-plate (HWP), rotating the state of polarization in the desired way and finally a second QWP, which transforms the linear state back to any arbitrary one.
Most of the devices listed below make use of this concept but have several different approaches to achieve it.
- Polarization rotators – Piezo based polarization rotator
- Polarization rotators – Manuel polarization rotator (free-space)
- Polarization rotators – Integrated LiNbO3 based high speed polarization rotator