Speaker
Description
Angular-Resolved Polarimetry of Smith-Purcell Radiation
Feiyan Zhao1,*, Zahava Barkay2, Ady Arie1,2
1School of Electrical and Computer Engineering, Fleischman Faculty of Engineering, Tel Aviv University, Tel Aviv 6997801, Israel.
2 Jan Koum Center for Nanoscience and Nanotechnology, Tel Aviv University, Tel Aviv 6997801, Israel.
*feiyanz@mail.tau.ac.il
Free-electron–photon interactions provide a powerful platform for shaping light emission at the nanoscale. Here, we investigate the polarization properties of Smith–Purcell radiation driven by low-energy electrons in a scanning electron microscope using angle-resolved cathodoluminescence and full-Stokes polarimetry.
We demonstrate that the polarization state of the emitted radiation exhibits a strong momentum dependence and can be systematically controlled through grating geometry and electron injection position. Structural symmetry breaking enables redistribution between orthogonal radiation channels, providing a route to engineer linear, elliptical, and circular polarization components.
Building on this framework, we outline the extension to two-dimensional periodic structures, where additional in-plane degrees of freedom are expected to further enrich the polarization response and enable more versatile control of free-electron radiation.