On-chip laser-driven free-electron spin polarizer Woodahl, Clarisse Murillo, Melanie Roques-Carmes, Charles Karnieli, Aviv Miller, David A. B. Solgaard, Olav ddc:530 Spin-polarized electron beam sources enable studies of spin-dependent electric and magnetic effects at the nanoscale. We propose a method of creating spin-polarized electrons on an integrated photonics chip by laser-driven nanophotonic fields. A two-stage interaction separated by a free-space drift length is proposed, where the first stage and drift length introduces spin-dependent characteristics into the probability distribution of the electron wave function. The second stage uses an adjusted optical near field to rotate the spin states utilizing the spin-dependent wave-packet distribution to produce electrons with high ensemble average spin expectation values. This platform provides an integrated and compact method to generate spin-polarized electrons, implementable with millimeter scale chips and tabletop lasers. American Physical Society 2026 info:eu-repo/semantics/article doc-type:article article http://purl.org/coar/resource_type/c_2df8fbb1 https://research-explorer.ista.ac.at/record/21555 Woodahl C, Murillo M, Roques-Carmes C, Karnieli A, Miller DAB, Solgaard O. On-chip laser-driven free-electron spin polarizer. <i>Physical Review Letters</i>. 2026;136(6). doi:<a href="https://doi.org/10.1103/3c1m-d3hh">10.1103/3c1m-d3hh</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1103/3c1m-d3hh info:eu-repo/semantics/altIdentifier/issn/0031-9007 info:eu-repo/semantics/altIdentifier/e-issn/1079-7114 https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess