Universal phase relation between longitudinal and transverse fields observed in focused terahertz beams
Optics
2015-06-11 v1
Abstract
We directly observe longitudinal electromagnetic fields in focused freely propagating terahertz beams of radial and linear polarization. In accordance with theory, the longitudinal fields are phase shifted by a value of pi/2 with respect to the transverse field components. This behavior is found for all frequency components of single cycle THz radiation pulses. Additionally we show that the longitudinal field of a radially polarized THz beam has a smaller spot size as compared to the transverse field of a linearly polarized beam, that is focused under the same conditions.
Cite
@article{arxiv.1208.4482,
title = {Universal phase relation between longitudinal and transverse fields observed in focused terahertz beams},
author = {S. Winnerl and R. Hubrich and M. Mittendorff and H. Schneider and M. Helm},
journal= {arXiv preprint arXiv:1208.4482},
year = {2015}
}