Home > Research > Publications & Outputs > Precise and accurate control of the ellipticity...


Text available via DOI:

View graph of relations

Precise and accurate control of the ellipticity of THz radiation using a photoconductive pixel array

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number121105
<mark>Journal publication date</mark>20/09/2021
<mark>Journal</mark>Applied Physics Letters
Issue number12
Number of pages5
Publication StatusPublished
<mark>Original language</mark>English


Full control of the ellipticity of broadband pulses of THz radiation, from linear to left- or right-handed circular polarization, was demonstrated via a four-pixel photoconductive emitter with an integrated achromatic waveplate. Excellent polarization purity and accuracy were achieved, with Stokes parameters exceeding 97% for linear and circular polarization, via a robust scheme that corrected electrically for polarization changes caused by imperfect optical elements. Furthermore, to assess the speed and precision of measurements of the THz polarization, we introduced a figure of merit, the standard error after one second of measurement, found to be 0.047° for the polarization angle.