2026-10-14T04:18:10Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34033647 2026-09-30T16:01:03Z category_37476 portal_1023 item_type_12 month_year_09_2026

Surface-Normal Electric Spin in Obliquely Excited Parallel-Slit SPP Fields Naoki Ichiji (7036778) Physics (arXiv) physics.optics (arXiv) Handedness-dependent light-matter interactions require control of local electric-field rotation, but generating controlled surface-normal spin textures is difficult under oblique illumination. Here, we show that oblique s-polarized illumination of a periodic array of parallel slits produces spatially alternating surface-normal electric spin, with its period continuously tunable by the incidence angle. We further show that the spin texture changes qualitatively between substrate- and air-side excitation depending on whether the SPP field interferes with the excitation field. Under substrate-side excitation, the spin distribution follows the conventional spin-flow relation, whereas under air-side excitation, interference between the SPP and excitation fields produces a distinct spatial periodicity and allows the spin extrema to coincide with the field-intensity maxima. A simple interference model reproduces these contrasting spin textures. 2026-09-28T00:00:00Z Text Preprint 10.48550/arXiv.2609.34224 https://figshare.com/articles/preprint/Surface-Normal_Electric_Spin_in_Obliquely_Excited_Parallel-Slit_SPP_Fields/34033647 CC0