2026-10-13T19:46:05Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34033596 2026-09-30T16:00:30Z category_37476 portal_1023 item_type_12 month_year_09_2026

Geometry-Controlled Polarization Photocurrents in Scalable PtSe2 Infrared Pixels Eunice Y. Paik (25144749) Owen A. Vail (1578598) Madaline R. Marland (21497305) William A. Beck (25144752) Antonio Llopis-Jepsen (25144755) Wendy L. Sarney (4721475) Jeffery H. Leach (25144758) Stefan Heiserer (20711259) Nikolas Dominik (15321763) Cormac Ó Coileáin (25144761) Paul B. Seifert (25144764) Georg S. Duesberg (1295520) Blair C. Connelly (25144767) George J. de Coster (22072091) Physics (arXiv) physics.optics (arXiv) cond-mat.mes-hall (arXiv) Polarization-sensitive photodetectors provide multi-dimensional optical information beyond the capabilities of traditional intensity-based detectors. The noble metal dichalcogenide PtSe2 presents unique opportunities for tunable polarization detection due to its strong spin-orbit coupling, material stability, customizable broadband polarization responses, and direct compatibility with a wide range of substrates for back-end-of-line silicon integration. In this work, we demonstrate room-temperature near-infrared to mid-wavelength infrared polarization photoresponses using scalable, as-grown, wide-area PtSe2 films, and we show that the measured polarization response is reshaped by device geometry. Finite-element current-flow simulations reproduce the observed spatial redistribution of the polarization-sensitive response and localize the transverse polarization response near the pixel center. This geometry-enabled separation allows wavelength-dependent laser spot scans to distinguish symmetry-allowed photocurrents from contact-proximate, dichroism-mediated photothermal contributions. At near-infrared wavelengths, we observe spatial response that is consistent with linear-dichroic photothermoelectric currents, whereas mid-wavelength infrared measurements reveal a helicity-dependent photothermal contribution under oblique illumination. These results identify pixel boundary engineering as both a design lever and a diagnostic tool for scalable PtSe2 polarization-sensitive infrared pixels. 2026-09-26T00:00:00Z Text Preprint 10.48550/arXiv.2609.32136 https://figshare.com/articles/preprint/Geometry-Controlled_Polarization_Photocurrents_in_Scalable_PtSe2_Infrared_Pixels/34033596 CC0