We propose an all-optical Knife Edge characterization technique and we demonstrate its working principle by characterizing the sub-{\lambda} features of a spatially modulated Terahertz source directly on the nonlinear crystal employed for the Terahertz generation.
@article{arxiv.1502.03873,
title = {Sub-wavelength terahertz beam profiling of a THz source via an all-optical knife-edge technique},
author = {Sze Phing Ho and Anna Mazhorova and Mostafa Shalaby and Marco Peccianti and Matteo Clerici and Alessia Pasquazi and Yavuz Ozturk and Jalil Ali and Roberto Morandotti},
journal= {arXiv preprint arXiv:1502.03873},
year = {2015}
}